JwottXJ

Hey guys, I got a little bit of a problem. I just put new adjustable LCA in the jeep and I made them about 1-2cm longer than my old fixed ones that came with my 4.5" lift. After putting them in I can hear and feel this vibration when slowing down anywhere from 10-30 mph. I looked under the jeep and the LCA's looked fine but the drive shaft looked further out than it usually does. Could that be the problem? Here a pic to show you the separation, thanks!

holycaveman

It's possible. I would check and see if your driveshaft is at max extension or you have some travel left. If it's maxed it could have vibration. If it's not then it should not make a difference

884x4

That ds is no where near maxed
This is the stock xj front shaft on my rear with the sye and 8.8.
It's still got about 1/2" of splines lift in there and it twice as far out as yours lol

beasticles

Did you have vibes before? Post a pic of your pinion angle. Sounds like you pushed your axle forward and threw off your angles a bit. I just bought adjustable upper and lower control arms but the upper arm is really the reason I bought it so I could rotate the front axle up and over just a tad to fix my pinion angle.

884x4

Yeah take a pic of the pinion meeting the ds. The pinion yoke should be right in line with the ds.

holycaveman

My pinion angle is way down and no vibes at all. 1 cm should not do anything honestly

JwottXJ

Ok I'll take a pic

JwottXJ

Here ya go

Rockfrog

Front pinion angle needs to come up ... A lot.
Rear may have issue as it looks pretty stretched out for the stock shaft, especially the later external seal slips. Angle needs to drop a few degrees if not doing an SYE.
Rear should be 1 to 2 degrees down from even to the out put on the case.
Front needs to point at the front out put on the case, maybe a degree above at most.

sycoglitch

Looks like pinion angle may be off. Take a pic of the front pinion from the side, not from that far away. An you LCA have a horrible angle. I think its time you consider CA DB or long arms IMHo

JwottXJ

Ok

884x4

Low pinion Dana 30, that angles actually pretty bad...adjustable uppers should be next on the list

JwottXJ

How do I fix the angles and stuff?

884x4

With adjustable uppers you can "roll" the axle forward fixing the angle

JwottXJ

Is the rear angle fine?