From: "Willem-Jan Markerink" To: fj55@birfield.com Subject: SOA & double-cardan (was: [FJ55] Discussion of my spring over Reply-To: fj55@birfield.com Date: Fri, 18 Apr 2003 12:59:30 +0200 On 16 Apr 2003 at 17:45, Todd Kaderabek wrote: > On Wed, 16 Apr 2003 17:08:32 -0400 > Wngrog@aol.com wrote: > > In a message dated 4/16/2003 2:45:54 PM Eastern Standard > > Time, todd@larkbooks.com writes: > > > > > Is my truck still evolving? Are you kidding...? > > > > To me the only reason to do the cut/turn is to keep the > > front driveline from binding. > > > > On an FJ-40, it is optional. > > > > On a short front driveshaft rig like a wagon, I will be > > surprised if you don't run into driveline binding. > > > > What is the story there? > > We ground out the knuckles. Doesn't bind when tested. Btw, couldn't one solve this steep angle also by using a double- cardan on either or both ends? Or is there not enough room for that, not even on one side? (not to mention both) Early 60-series had a double-cardan on the T-case end.... (which might fit, since later 60-series had a different U-joint bolt- pattern I believe (and/or splines in the slip-joint?) -- Bye, Willem-Jan Markerink The desire to understand is sometimes far less intelligent than the inability to understand [note: 'a-one' & 'en-el'!] Subject: RE: SOA & double-cardan (was: [FJ55] Discussion of my spring over From: "Williams, Lance" To: Reply-To: fj55@birfield.com Date: Fri, 18 Apr 2003 08:43:16 -0400 No. Non-CV shafts normally have higher angular tolerance than CV shafts. In this case, a double cardan, you essentially have two u-joints back to back. (two single cardan=3Ddouble cardan) They have a collar between them, and it usually restricts the allowed angle significantly. The FJ60 DC shaft has less angular tolerance than the FJ55 shaft. Bear in mind that you wouldn't need a DC at both ends. The purpose of the DC shaft is to eliminate vibration that would otherwise occur if you had u-joints at both ends that were not opposite of one another. In typical application (like a stock 55) the u-joints oppose one another and cancel each other's vibration. (obviously a simplified explanation) When you rotate the front pinion up you no longer have opposing u-joints and thus you require a CV at the tcase end to eliminate vibration. (in this case, you'd probably choose an FJ60 DC shaft, and have it shortened to fit) It's also worth noting that the IFS minitruck DC front driveshaft allows more angular tolerance and is (according to what Marlin told me years ago) very strong. (I know this is the high-angle Toyota DC that Tom Woods uses, or used on the shafts we bought from them when I was doing SOA's under LobsterFab anyway) Lance From: Wngrog@aol.com To: fj55@birfield.com Subject: Re: SOA & double-cardan (was: [FJ55] Discussion of my spring over Reply-To: fj55@birfield.com Date: Fri, 18 Apr 2003 09:06:23 -0400 In a message dated 4/18/2003 7:43:16 AM Eastern Standard Time, LanceW@cov.com writes: > Non-CV shafts normally have higher angular tolerance than > CV shafts. If you run into problems, the V6 mini truck u-joint has nearly 35 degrees of angular tolerance versus around 23 degrees with the land cruiser u joint. You could have someone build you a slip yoke with the Mini Truck u-joint on the diff. end. I had to do this on the front of my FJ-40 because the 1310 U joint I had at the Atlas end was binding up at full droop. Nolen Grogan Kate,77 FJ-40 Wilbur, 71 FJ-55