From: "Norm Needham" To: "80sCOOL" <80_series@sgiblab.sgi.com> Subject: Re: [80] Tyre heights and gearing Date sent: Wed, 17 Nov 1999 18:44:45 +1100 Send reply to: 80_series@sgiblab.sgi.com Hi Anthony, Ian and Paul, There seems to be some confusion/contradictions in this thread. You fellas are talking of 105s and 80s in the same breath. Here's the ducks guts: 1) 80s have 4.11:1 diff ratio. 2) 105s have 4.3:1 diff ratio. 3) Front diffs in both ARE identical but for ratio; crown and pinion interchangeable. 4) Rear diffs are NOT identical; 105 has wider crown wheel and bigger diameter axles. 5) We therefore assume that 105 crown wheel and pinion will NOT fit 80 centre. That rules out 4.3:1 ratio for 80s. 6) Reserved. ;-) 7) Neither are complete "pumpkins" interchangeable, because of bigger side gear splines for bigger 105 axles. That rules out a 105 rear (4.3:1) diff in an 80 without using the whole rear end. Whole rear end swap presents problems with brakes (different) and 5 stud hubs. 8) 4.56:1 (not 4.65) crown wheel and pinion ARE available aftermarket for 80s. 9) 4.88:1 available aftermarket for rear, but ONLY genuine for front. This is because 40s, 60s etc. use same crown wheel and pinion front and rear. These are the same as 80s rear and the aftermarket industry is geared up to service those users (40s, 60s etc.). 10) 4.56:1 and 4.88:1 (to my knowledge) are NOT available for 105 rear. 11) No-one at this stage is making different gears for 80s or 105s transfer. Conclusions: 1) Anthony does not have much choice for his 105. 2) Ian is right, as far as 80s are concerned (especially the bit about "lookin' gooood"). 3) Paul cannot use Anthony's 105 diffs because they won't fit his 80. He can use the front; sure would feel funny though. ;-) Cheers * Norm Needham * * Traction4 / ARB Northside * Sydney, Australia * Trac4@bigpond.com From: AU Sunshine-mgr Western Farm Service To: "'80_series@sgiblab.sgi.com'" <80_series@sgiblab.sgi.com> Subject: [80] 100/105 rear diff question Date sent: Thu, 23 Mar 2000 17:32:33 -0600 Send reply to: 80_series@sgiblab.sgi.com I'm sure that this question has been raised before but what is the difference between the rear diff on the 80's compared to the 100 series? Further to GC's disintegrating rear air locker (5 bolt), what changes were made to the latter ones (8 bolt) and how does this compare to what's available for the 100 as ARB's part number changes, so it must be different again? Regards, Greg Goulden 1990 HDJ80 VX TD-I Melb. Aust. From: "Norm Needham" To: <80_series@sgiblab.sgi.com> Subject: Re: [80] 100/105 rear diff question Date sent: Fri, 24 Mar 2000 14:46:29 +1100 Send reply to: 80_series@sgiblab.sgi.com From: AU Sunshine-mgr Western Farm Service >I'm sure that this question has been raised before but what is the >difference between the rear diff on the 80's compared to the 100 series? > 105 has wider gears (crown wheel), different ratio, and uses bigger axles. Overall, a stronger set-up than 80. >Further to GC's disintegrating rear air locker (5 bolt), what changes were >made to the latter ones (8 bolt) and how does this compare to what's >available for the 100 as ARB's part number changes, so it must be different >again? The original design had the occasional problem of the hemisphere end cap bolts (screws) stretching and coming loose. The fix was simply to fit more screws. Yes, the 105 diff is a different part number (because of different size crown wheel and side gears). It does however share the same basic design as the 80. Cheers * Norm Needham * * Traction 4 / ARB Northside * Sydney, Australia * Trac4@bigpond.com Trac4@telstra.com To: <80scool@yahoogroups.com> From: "Robbie Antonson" Date: Thu, 8 Jan 2004 08:57:43 -0700 Subject: Re: [80] Weight of 93 1FZFE Reply-To: 80scool@yahoogroups.com ----- Original Message ----- From: Karl Bellve To: 80scool@yahoogroups.com Cc: Peter Persad Sent: Thursday, January 08, 2004 8:07 AM Subject: Re: [80] Weight of 93 1FZFE Kemasa wrote: > On Wednesday 07 January 2004 05:13 pm, Peter Persad wrote: > > Anyone out there know what the weight of my 1993 1FZFE 80 Series is? > > Close to 6000lbs, but a bit under, but that is empty. > > > How about my towing capacity? > > 5000 lbs, 500lbs tongue weight. > > > I do have the towing package on this one and it's time to buy the family > > camping trailer. > > > > Suggestions? I tow a 30" Camper which is an ultralight. You will need to look at ultralights to be able to tow those lengths. The Gross Weight of my camper is 6000lbs. My hitch (Drawtite) is rated at 6000lbs when using weight distribution. You will need to use weight distribution on anything over 3500lbs. You will need to use an electric brake controller. I also use dual-cam sway control. Big trucks passing me on the highway didn't bother me at all. The 1FZFE engine is a little underpowered but my LX450 did great pulling my trailer going up hills in Maine this past summer. I will get the S/C eventually. The weight of the Landcruiser/LX450 is a bonus. It helps with towing. The FJ100 has a higher tow rating but that is due to the added power of the V8. It uses the same rear axle, and same tranny. Besides my 6000lb hitch, Kaymar sells a rear bumper rated for 3500kg (more than 7000lbs). Factory hitch is only rated to 5000lbs. -- Cheers, Karl Bellve Hello Karl: The UZJ 100 does use the same tranny but not the same axle as an 80. It is a semi floater not a full floater and the gearing in the early 100 series is 4.3 instead of 4.1. Still disc brakes and it is a different type of semi, like the mini trucks pressed on bearing to the axle instead of the housing. No c-clips in the diff. Later Robbie Robbie Antonson ------------------------------------------------------------------- www.sleeoffroad.com - tech@sleeoffroad.com - Tel (303) 278 8287 700 Pine Ridge Road, Unit 2, Golden CO 80402 ------------------------------------------------------------------- To: "'80scool@yahoogroups.com'" <80scool@yahoogroups.com> From: Bybee Sean F SSgt 381 IS/SCMN Date: Thu, 8 Jan 2004 17:08:20 -0000 Subject: [80] 100 series axle diameter Reply-To: 80scool@yahoogroups.com I heard that with the introduction of 100 series (78, 79, 105), Toyota increased the inner axle diameter/spline count. Can any one confirm or deny this? AFAIK, later 40 series 55/60/80 series are 33mm in diameter and 30 fine spline. The 80 series birfields/cv's are larger though. BTW, I don't own a 80 series, but I'm looking to swap some 80 series (maybe 105) axles under my FJ60 down the road. Sean To: 80scool@yahoogroups.com From: "idcruiserman" Date: Thu, 08 Jan 2004 17:27:44 -0000 Subject: 100 rear axle [was Re: [80] Weight of 93 1FZFE] Reply-To: 80scool@yahoogroups.com --- In 80scool@yahoogroups.com, "Robbie Antonson" wrote: > Hello Karl: > The UZJ 100 does use the same tranny but not the same axle as > an 80. It is a smei floater not a full floater and the gearing in the > early 100 series is 4.3 instead of 4.1. Still disc brakes and it is a > different type of semi, like the mini trucks pressed on bearing to > the axle instead of the housing. no c-clips in the diff. later Robbie > > Robbie Antonson What about the locked diff 100s? Aren't those full-floating like the 80 series but with 10mm axle flange studs? To: <80scool@yahoogroups.com> From: "Christo Slee" Date: Thu, 8 Jan 2004 10:39:47 -0700 Subject: RE: 100 rear axle [was Re: [80] Weight of 93 1FZFE] Reply-To: 80scool@yahoogroups.com > What about the locked diff 100s? Aren't those full-floating like the > 80 series but with 10mm axle flange studs? Nope, they are also semi floating. Christo To: 80scool@yahoogroups.com From: "idcruiserman" Date: Thu, 08 Jan 2004 17:53:56 -0000 Subject: 100 rear axle [was Re: [80] Weight of 93 1FZFE] Reply-To: 80scool@yahoogroups.com --- In 80scool@yahoogroups.com, "Christo Slee" wrote: > > What about the locked diff 100s? Aren't those full-floating like the > > 80 series but with 10mm axle flange studs? > > Nope, they are also semi floating. > > Christo Interesting. Did the locker design change? I guess it would be like the Taco locker. To: <80scool@yahoogroups.com> From: "Robbie Antonson" Date: Thu, 8 Jan 2004 10:56:38 -0700 Subject: Re: 100 rear axle [was Re: [80] Weight of 93 1FZFE] Reply-To: 80scool@yahoogroups.com ----- Original Message ----- From: idcruiserman Sent: Thursday, January 08, 2004 10:27 AM > What about the locked diff 100s? Aren't those full-floating like the > 80 series but with 10mm axle flange studs? No they are a semi floater also. The 10 mm studs are in the front hub with the IFS. The spindle is different then the 80 series and uses a different inner bearing that is about 30% bigger then the inner bearing on the 80. As for the axle in the back I have not had one out to see the size difference and splin count. The front axle does not look any bigger in diameter, the front drive flange might interchange after you redrill and tap the 80 series hub. I will have to look the next time we have a 100 in the shop. Later Robbie Robbie Antonson ------------------------------------------------------------------- www.sleeoffroad.com - tech@sleeoffroad.com - Tel (303) 278 8287 700 Pine Ridge Road, Unit 2, Golden CO 80402 ------------------------------------------------------------------- To: 80scool@yahoogroups.com From: "idcruiserman" Date: Thu, 08 Jan 2004 18:19:08 -0000 Subject: 100 rear axle [was Re: [80] Weight of 93 1FZFE] Reply-To: 80scool@yahoogroups.com --- In 80scool@yahoogroups.com, "Robbie Antonson" wrote: > No they are a semi floater also. The 10 mm studs are in the front > hub with the IFS. The spindle is different then the 80 series and > uses a different inner bearing that is about 30% bigger then the > inner bearing on the 80. As for the axle in the back I have not had > one out to see the size difference and splin count. The front axle > does not look any bigger in diameter, the front drive flange might > interchange after you redrill and tap the 80 series hub. I will have > to look the next time we have a 100 in the shop. later Robbie > > Robbie Antonson I'm curious about how the rear disc brake and e-brake are setup on the 100 also. By inner bearing, are you talking about the wheel bearing? thx, eric To: "'80scool@yahoogroups.com'" <80scool@yahoogroups.com> From: Bybee Sean F SSgt 381 IS/SCMN Date: Thu, 8 Jan 2004 18:41:27 -0000 Subject: [80] RE: 105/78/79 rear axle...was Re: 100 rear axle Reply-To: 80scool@yahoogroups.com > -----Original Message----- > From: Robbie Antonson [mailto:tech@sleeoffroad.com] > Sent: Thursday, January 08, 2004 8:57 AM > > > No they are a semi floater also. The 10 mm studs are in the > front hub with the IFS. The spindle is different then the 80 > series and uses a different inner bearing that is about 30% > bigger then the inner bearing on the 80. As for the axle in > the back I have not had one out to see the size difference > and splin count. The front axle does not look any bigger in > diameter, the front drive flange might interchange after you > redrill and tap the 80 series hub. I will have to look the > next time we have a 100 in the shop. later Robbie > > Robbie Antonson Any idea about the 105 or the 78/79? Are the rears FF? Are the axles (105) wider than the 80 series? How about the inner axle diameter/spline count? How about the birfields? Sean To: <80scool@yahoogroups.com> From: "Robbie Antonson" Date: Thu, 8 Jan 2004 11:46:55 -0700 Subject: Re: 100 rear axle [was Re: [80] Weight of 93 1FZFE] Reply-To: 80scool@yahoogroups.com ----- Original Message ----- From: idcruiserman Sent: Thursday, January 08, 2004 11:19 AM > I'm curious about how the rear disc brake and e-brake are setup on > the 100 also. > > By inner bearing, are you talking about the wheel bearing? > > thx, eric Yes it is the hub inner bearing for the front wheel. Rear parking brake is similar to the 80 series full floater, drum and disc design. The parking brake being the inner drum type. This set up is not on the semi floating 80 series. Robbie Antonson ------------------------------------------------------------------- www.sleeoffroad.com - tech@sleeoffroad.com - Tel (303) 278 8287 700 Pine Ridge Road, Unit 2, Golden CO 80402 ------------------------------------------------------------------- To: "'80scool@yahoogroups.com'" <80scool@yahoogroups.com> From: Bybee Sean F SSgt 381 IS/SCMN Date: Thu, 8 Jan 2004 23:28:30 -0000 Subject: RE: [80] 105/78/79 rear axle...was Re: 100 rear axle Reply-To: 80scool@yahoogroups.com > The 78/79 and 105 all have full floating rears. Like the 100, I know > the rear crownwheel is heavier (thicker/wider), but I'm not sure on > axle diameter or spline count. I've heard that they're 31 spline, not sure what the diameter is though. This is just hearsay too. > Going by brochure specs, the 80 lists the front track at 1595mm and > rear at 1600mm. The 105 lists front at 1620mm and rear at 1615mm > (same size wheels and rim offset). The 78/79's will be narrower. I'm wondering if Toyota used the 80 series axles and just went with an wider rim and/or tire? 25mm wider in the front isn't very much of a difference, less than a 1". > > Birfields, can't say as I haven't seen inside there yet but I'd guess > they are the same as the 80. Well, compared to my 60 series, the 80's are huge!:-) Sean To: <80scool@yahoogroups.com> From: "Stefan Kossen" Date: Fri, 9 Jan 2004 19:54:09 +1000 Subject: RE: [80] 105/78/79 rear axle...was Re: 100 rear axle Reply-To: 80scool@yahoogroups.com Hi, My HZJ105 has what looks like a spacer from factory on the front, This is bolted to the brake rotor. This would give it the extra offset Greg mentioned. Have you seen this on yours Greg? Also the front axles are the same diameter I believe as the inner axle seal are the same, But I believe the 80 has a bush, where as the 105 has roller bearings in the front...... I haven't pulled mine apart yet to confirm, but I will soon. Cheers, Stefan. HZJ105 To: 80scool@yahoogroups.com From: "dr_jchow" Date: Fri, 09 Jan 2004 15:29:58 -0000 Subject: [80] 105/78/79 rear axle...was Re: 100 rear axle->hzj105 Reply-To: 80scool@yahoogroups.com --- In 80scool@yahoogroups.com, "Stefan Kossen" wrote: > Hi, > > My HZJ105 has what looks like a spacer from factory on the front, > This is bolted to the brake rotor. > This would give it the extra offset Greg mentioned. > Have you seen this on yours Greg? > > Also the front axles are the same diameter I believe as the inner axle > seal are the same, > But I believe the 80 has a bush, where as the 105 has roller bearings in > the front...... > I haven't pulled mine apart yet to confirm, but I will soon. > > Cheers, > > Stefan. > HZJ105 Stefan, hope you don't mind me asking some questions about the 105 since we don't get that model in N. America. Just out of curiosity, how is the acceleration going uphill on your 105? Can you maintain, say, 100 km/hr up a mountain pass with, say, 300 kg passengers/gear or does the speed just fade away? Are you running a third-party turbo kit like the Safari? Are those reliable and can the bearings handle the extra load? Is the 105 the one w/ the manual tranny clutch shudder problem, or is that the 100 or both 100 and 105? I thought the 105's came w/ the H-series tranny used in the 78's w/ 4.8 1st gear while the 100's came w/ the R-series 5spd. -Jim Return-Path: Delivered-To: wjmarkerink@mail1.a1.nl Received: from localhost (chatserver.a3.nl [213.171.64.213]) by mail1.a1.nl (Postfix) with ESMTP id A399D1175E89 for ; Fri, 9 Jan 2004 16:49:27 +0100 (CET) Received: from mail1.a1.nl ([213.171.64.3]) by localhost (backup [213.171.64.213]) (amavisd-new, port 10024) with SMTP id 13457-01 for ; Fri, 9 Jan 2004 16:49:21 +0100 (CET) Received: from flap.boswell-online.nl (flap.boswell-online.nl [213.171.64.13]) by mail1.a1.nl (Postfix) with ESMTP id 8796011CACE0 for ; Fri, 9 Jan 2004 16:49:20 +0100 (CET) Received: from n12.grp.scd.yahoo.com (n12.grp.scd.yahoo.com [66.218.66.67]) by flap.boswell-online.nl (Postfix) with SMTP id 8C891200009A for ; Fri, 9 Jan 2004 17:52:42 +0100 (CET) X-eGroups-Return: sentto-2598991-51595-1073663357-w.j.markerink=a1.nl@returns.groups.yahoo.com Received: from [66.218.66.159] by n12.grp.scd.yahoo.com with NNFMP; 09 Jan 2004 15:49:18 -0000 X-Sender: stefank@cosoz.net.au X-Apparently-To: 80scool@yahoogroups.com Received: (qmail 12612 invoked from network); 9 Jan 2004 15:49:12 -0000 Received: from unknown (66.218.66.167) by m19.grp.scd.yahoo.com with QMQP; 9 Jan 2004 15:49:12 -0000 Received: from unknown (HELO telenet.net.au) (202.9.50.44) by mta6.grp.scd.yahoo.com with SMTP; 9 Jan 2004 15:49:11 -0000 Received: (qmail 16617 invoked by uid 503); 9 Jan 2004 15:49:11 -0000 Received: from mail.telenet.net.au (HELO telenet.net.au) (202.9.50.20) by kribensis.telenet.net.au with SMTP; 9 Jan 2004 15:49:11 -0000 Received: (qmail 16727 invoked by uid 503); 9 Jan 2004 15:49:09 -0000 Received: from dialup-117.186.220.203.acc01-nick-kwt.comindico.com.au (HELO stefanfidurz7) (203.220.186.117) by mail.telenet.net.au with SMTP; 9 Jan 2004 15:49:09 -0000 To: <80scool@yahoogroups.com> Message-ID: <001c01c3d6c8$1c19ec10$3500a8c0@stefanfidurz7> X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-eGroups-Remote-IP: 202.9.50.44 From: "Stefan Kossen" X-Yahoo-Profile: stefs_cruiser MIME-Version: 1.0 Mailing-List: list 80scool@yahoogroups.com; contact 80scool-owner@yahoogroups.com Delivered-To: mailing list 80scool@yahoogroups.com Precedence: bulk List-Unsubscribe: Date: Sat, 10 Jan 2004 01:49:04 +1000 Subject: RE: [80] 105/78/79 rear axle...was Re: 100 rear axle->hzj105 Reply-To: 80scool@yahoogroups.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Virus-Scanned: by Spamscan at A1 de internet provider uit Twente B.V. Answers are inserted -----Original Message----- From: dr_jchow [mailto:dr_jchow@yahoo.com] Sent: Saturday, 10 January 2004 1:30 AM > Stefan, hope you don't mind me asking some questions about the 105 > since we don't get that model in N. America. > > Just out of curiosity, how is the acceleration going uphill on your > 105? Piss poor, remember it is only 96Kw..... > Can you maintain, say, 100 km/hr up a mountain pass with, say, > 300 kg passengers/gear or does the speed just fade away? No, the speed just fades away.... > Are you running a third-party turbo kit like the Safari? No, mine is stock standard engine wise...... > Are those reliable and can the bearings handle the extra load? I believe the bearings are OK, but depending how much you want to increase your performance.... The first failure in my opinion would be a crack in the precombustion chamber...... > Is the 105 the one w/ the manual tranny clutch shudder problem, Supposedly, but have not experienced it, believes it comes back to driving style myself..... > or is that the 100 or both 100 and 105? Don't know..... > I thought the 105's came w/ the H-series tranny used in the > 78's w/ 4.8 1st gear while the 100's came w/ the R-series 5spd. Not sure here either, but one of the Frankenstein owners can probably answer that, Greg are you there :-) Cheers, Stefan....... To: 80scool@yahoogroups.com From: "Greg Goulden" Date: Sun, 11 Jan 2004 22:32:51 -0000 Subject: [80] 105/78/79 rear axle...was Re: 100 rear axle->hzj105 Reply-To: 80scool@yahoogroups.com Jim, Some comments of my own inseted too. --- In 80scool@yahoogroups.com, "Stefan Kossen" wrote: > Answers are inserted > > -----Original Message----- > From: dr_jchow [mailto:dr_jchow@y...] > >> Stefan, hope you don't mind me asking some questions about the 105 >> since we don't get that model in N. America. >> >> Just out of curiosity, how is the acceleration going uphill on your >> 105? > > Piss poor, remember it is only 96Kw..... And Jim, 96kW = 128HP. Factor in 3 Tonnes (3000kg / 6600lbs) of truck and you'll see a picture forming ;-) >> Can you maintain, say, 100 km/hr up a mountain pass with, say, >> 300 kg passengers/gear or does the speed just fade away? > > No, the speed just fades away.... And we don't have the high elevation mountain passes that you guys have either. 4500 feet is a big hill here! >> Are you running a third-party turbo kit like the Safari? >> >> No, mine is stock standard engine wise...... Mines not. I did run the intercooled Safari turbo kit on the 1HZ, but the results didn't live up to my expectations (or my previous vehicle, and intercooled HDJ80!) I transplanted a 1HD-FT into mine. >> Are those reliable and can the bearings handle the extra load? > > I believe the bearings are OK, but depending how much you want to > increase your performance.... > The first failure in my opinion would be a crack in the > precombustion chamber...... Jim, the bottom end (crank, bearings, etc ) is virtually identical to the factory turbocharged versions, so that's not the weak point. As Stefan said, it's the combustion area which is the weakness, more power requires more fuel, which means greater combustion heat. Indirect injection is not as efficient, and as such more heat has to be dissapated somewhere. >> Is the 105 the one w/ the manual tranny clutch shudder problem, > > Supposedly, but have not experienced it, believes it comes back to > driving style myself..... Early on there was reports of owners with clutch shudder problems. I personally did experience some shudder, particularly on cold damp mornings. It was a bitch, but it went away when warmed up. Driving style does have a big influence on clutch operation IMO. >> or is that the 100 or both 100 and 105? > > Don't know..... > >> I thought the 105's came w/ the H-series tranny used in the >> 78's w/ 4.8 1st gear while the 100's came w/ the R-series 5spd. > > Not sure here either, but one of the Frankenstein owners can > probably answer that, Greg are you there :-) R series = lighter gearbox, H series = heavy. None of the boxes have a 4.8:1 1st gear. R151F = 4.313:1, H151F = 4.081:1, (H150F = 4.529:1). The 1HZ powered 78/79/105 (ie. HZJ78/79, HZJ105) uses the R151F gearbox. The 1FZ-FE, 2UZ-FE and 1HD-FTE engined 100's use the H151F. The 1FZ-FE and 1HD-FTE 78/79's use the H150F. Does this answer your questions Jim. If not, ask some more ;-) Regards, Greg Goulden 2000 HDJ105. To: 80scool_aus@yahoogroups.com From: All American Imports Date: Tue, 09 Mar 2004 12:05:21 +0100 Subject: RE: [80_aus] Re: 100 series diff ratios(chat) Reply-To: 80scool_aus@yahoogroups.com -----Oorspronkelijk bericht----- Van: andrew lukies [mailto:limo4b@yahoo.com.au] Verzonden: dinsdag 9 maart 2004 11:33 --- Greg Goulden wrote: >> Bazzle, >> >> No "list" as such, but from memory... >> >> All live axle models are 4.300:1 >> >> HDJ100 up to last update all 4.100:1 (4 speed autos >> and manuals) >> >> HDJ100 5 speed auto 3.900:1 >> HDJ100 5 speed manual 4.100:1 >> >> UZJ100 5 speed auto 4.100:1 >> UZJ100 5 speed manual 4.300:1 >> >> Regards, >> >> Greg Goulden >> 2000 HDJ100 >> > > Hey Greg > Do u think a ser of 105 gears would fit the 80's front > and rear, or the whole pumpkin etc?? > Andrew Hi Andrew, I hope you don't mind me sharing practical expirience with you ? Front diff from 105 will fit 80 series, rear diff is different. This is on a 80 series bolt en nut for the ringgear but a 105 has bolts only. Also the splineform of the sungears is different and the holes in the case where you fit the shafts are slightly larger than by the 80 series because the 105 has thicker shafts. Another thing to watch when you start swapping parts is that Toyota is changing the diametre of the pinionspline area. They started to do so somewhere around 2000. This means that your driveflange can have a different fittingsize, the oilsplashplate has a different diametre hole and the seal is different in diametre. Basicly the best deal for the rear is taking the 105 diff, put the sunwheels of the 80 inside and fit the whole thing. Going from 80 to 105 is a different story because than you have to put 105 sunwheels in the 80 series diff and machine the holes in the case to a bit larger diametre to fit the 105's thicker shafts. Be happy, Maarten Verschure