Originally Posted by Jeepin72
Maybe I didn't see it, what is your drive shaft angle?
Update for this one I am still searching. My driveshaft angle of front is ruffly 18*. I have rear pinion 1* lower which makes it pretty perfect smooth.
Caster set to approx 5.5-6* which leaves pinion angles at 2.5* which is perfect no issues. I adjusted everywhere from straight on dead to 5* low. No difference at all w my vibes.
Rear shaft on only (no front in) she goes smooth perfect to 80+mph
Front only in (rear out in 4x4 to move) went smooth to 80+mph.
Both in vibes bad 65+ more so at 70+ coasting or not 3rd or 4th gear in my auto.
My only lead is the front driveshaft cause it is under load when rear is out. An when I try to coast. When I run all shafts in an 4x4 on up to those speeds it's better and smooth. What the hell. Caught some real old threads of this in rubicons after new gears an regarding rpm of
The driveshaft being a problem. Others rebuilt, replaced, did everything possible and still does it. What do I do this will drive me nuts I didn't build my rig smaller lower an all to not be able to use on highway or trips. I would go big and wide open if I knew I would not have any drive ability on highway!