I'm new to the site but have found some very helpful information here so hopefully someone has some ideas for me.
I have a '85 CJ7 I just put a RE 4.5" lift on. The whole time I was crossing my fingers that the drive shaft wouldn't bind once I was finished. After everything was said and done (with 2.5* shims added in the rear) the u-joint at the transfer case doesn't bind....but just barely.
Is it possible to use steeper shims to adjust the pinion angle to help correct this temporarily? I'm assuming I'll have to put on a CV drive shaft, but would like to avoid it as long as I can.
Also, I've done numerous searches on this site but haven't found a "how-to" on what used CV drive shaft components I can use or what to look out for.
Thanks in advance for all the help and keep rockin'.
You could try larger shims but they may induce a driveline vibe. Might have to play around with shims and a transfer case drop to get the vibration cancelled out. Also, be aware that, although not binding, steep ujoint angles drastically reduce ujoint life. Another thing to be careful of.. if you're close to binding at static ride height, you really need to be careful about "unloading" the rear suspension (ie bouncing over a speed bump). That could droop the rear suspension enough to cause binding.. no warning.. just a bang.
Some folks (me included) grind the yokes to help keep from binding.
Your average stock ujoint will go farther before binding than a typical CV shaft will. However, with the CV you can rotate the pinion up further to reduce that angle. Also, the CV will split the angle between 2 joints.. usually extending ujoint life over a single joint.
'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..
'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff. http://www.jeepskate.net