Slight Wobble After Lift

[onlyinajeep726]

Those don't look like blocks... just the spring perches.  Though they do look a little thick from the picture.  Pictures add 10 lbs, right? :yes:

 

But as advised, fix the angle of your rear diff for starters.  The front looks off too, as mentioned.  Also, something I didn't see mentioned was your harsh steering geometry.  With the stock inverted y-steering and 4.5"+ of lift, those angles are considerably more stressful on everything.  If you wish to keep the stock steering, I'd advice a drop pit man arm as a must.

[HOrnbrod]

Those are not regulation D44 perches mate. It looks like whomever welded them on the axle tubes screwed up causing the axle pinion to point up towards the t-case, thus ruining the pinion angle.

 

You would need probably a 20*-25* shim to rotate the axle back down to. Nobody makes those AFAIK - 8* is about max. Shims are only used for fine adjustment. I think the best way is to cut them off and re-weld new perches.

[Incommando]

Those are not regulation D44 perches mate. It looks like whomever welded them on the axle tubes screwed up causing the axle pinion to point up towards the t-case, thus ruining the pinion angle.

 

You would need probably a 20*-25* shim to rotate the axle back down to. Nobody makes those AFAIK - 8* is about max. Shims are only used for fine adjustment. I think the best way is to cut them off and re-weld new perches.

Time to cut off the perches and start over... On the plus side new perches are cheap if you need them

[Cmbechtold]

Just talked to rusty he said the 6 degree shims he gave me should fix it

[HOrnbrod]

Here's your setup now:

 

This is how it should be set up:

 

Does it look like a six degree wedge will rotate the pinion down that much?

[Cmbechtold]

No probably not so what are my options before I change my perches?

[Cmbechtold]

I guess what I'm asking is what could I try to do so I don't have to change perches

[HOrnbrod]

Either a SYE or a new CV drive shaft should work (more $$). Getting new perches welded on the tubes correctly will work (less $$). 

[Pete M]

if it's a wobble (rather than a vibration), it's likely your alignment.  I would get that fixed first before attacking the rear.  as to the rear angles, you might be able to get away with just new joints an the 6* wedges.  it's not ideal, but might be close enough.  but as I said, get the front aligned first or else it might interfere with the diagnosis. 

[Cmbechtold]

Alignment is getting done tomorrow

[HOrnbrod]

Slight Wobble After Lift

 

"Slight" is a subjective word. With the rear drive shaft geometry as posted in your pics, wobble and/or vibration has to be a bit more than slight. But post up the alignment results if it helped any.

[Cmbechtold]

Alignment fixed vibration but I'm still gonna put shims in to try and bring that axle back to where it should be

[Incommando]

Alignment fixed vibration but I'm still gonna put shims in to try and bring that axle back to where it should be

Good deal!

[Pete M]

make sure you use steel shims.  or the highest quality aluminum.  cheapie aluminums get a bad wrap for cracking and getting spit out.

[airspeed]

"U" Joints are designed to work at an angle. There is a lot of geometry and engineering in drive shaft operation.