[dan3jeeps]

Here is my current rear pinion angle. It is set about perfectly inline with the rear drive shaft.

I am wanting to rotate it down just a bit (-1 to -2 degrees) to help eliminate some of the coil spring bend I have.

Raising the rear pinion was easy using a bottle jack under the differential. What is the easiest way to lower the pinion angle? Adjusting the UCA's is no big deal but the part where I actually rotate the pinion might be tricky, I am thinking.

Open for comments.

Thanks!

 

[christensent]

I am wanting to rotate it down just a bit (-1 to -2 degrees) to help eliminate some of the coil spring bend I have.


Raising the rear pinion was easy using a bottle jack under the differential. What is the easiest way to lower the pinion angle? Adjusting the UCA's is no big deal but the part where I actually rotate the pinion might be tricky, I am thinking.

It is actually a good idea to lower it. The rear pinion should be a few degrees low so that under acceleration squat it levels out to the correct pinion angle. The front should be the opposite, a few degrees too high.

It should be easy to lower it, both gravity and the springs will try to drop your pinion angle. If your control arms can be adjusted in place just crank them out longer and the pinion will adjust in place. Otherwise you could put a jack under the pinion, remove both upper control arms, carefully lower the jack the desired amount, and re-install the adjusted control arms.

 

[Tweak]

1. you already have ideal pinion - driveshaft angle

2. slight rearward coil spring bow is normal. That looks perfectly fine

 

[CrazyLarry]

It is actually a good idea to lower it. The rear pinion should be a few degrees low so that under acceleration squat it levels out to the correct pinion angle. The front should be the opposite, a few degrees too high.

It should be easy to lower it, both gravity and the springs will try to drop your pinion angle. If your control arms can be adjusted in place just crank them out longer and the pinion will adjust in place. Otherwise you could put a jack under the pinion, remove both upper control arms, carefully lower the jack the desired amount, and re-install the adjusted control arms.

Agreed

 

[david.cirasunda]

Anyone have any further or more recent opinions on this? Same issue 2012 JKU..Pinion pointed up and coils look like about to bend off the mounts. Adjusting upper control arms out makes it worse..only 2.5 in lift.

 

[thedirtman]

Cut the rear two tabs on the coil perch and use a crow bar to angle them up so they are flat again and weld a small section of bar stock under the perch. Takes about 15 min to do and something I do often on lifted jeeps.