Pinion angle help after 4” Rough Country lift install

[raphaelchicago]

Hello I current have a 2005 Jeep TJ with a 4 inch rough country suspension lift. (this kit here... https://www.roughcountry.com/jeep-suspension-lift-kit-907s.html) I have an sye kit and driveshaft. (sye kit ... https://www.quadratec.com/products/52237_98.htm ) driveshaft (https://www.quadratec.com/products/52301_9200_07.htm ) After the install i have very bad drive line vibrations and its almost like my driveshaft is too long causing it to bind. I measured the pinion angle at both the transfer case and diff and it has an 11 degree difference. Can i fix my problems by ordering adjustable upper control arms to fix the pinion angle or how how should i go about this?

 

[raphaelchicago]

@bobthetj03 was wondering if you cold take a look at my situation and give some input

 

[bobthetj03]

@bobthetj03 was wondering if you cold take a look at my situation and give some input

You need rear adjustable upper arms to re-adjust your pinion angle so it lines up with the drive shaft tube. For example,If your ds tube is at 14*, your pinion angle needs to be at 14*. Some will run the pinion angle 1* lower than the ds to allow for torque under load.

 

[Chris]

The only way to fix your issue is with either a transfer case drop, or a SYE and DC driveshaft, as well as rear upper adjustable control arms at a minimum.

 

[raphaelchicago]

okay thankyou so these should do the trick @bobthetj03 https://www.roughcountry.com/jeep-adjustable-control-arms-1199.html

 

[Kevin E]

Here's mine with 4" lift and adjustable control arms/super short sye

 

[bobthetj03]

okay thankyou so these should do the trick @bobthetj03 https://www.roughcountry.com/jeep-adjustable-control-arms-1199.html

Yep, those would do it. Assuming since you're from Canada that sourcing parts is difficult and shipping costly?

 

[raphaelchicago]

@bobthetj03 Ya, driving to the border is annoying but the prices in the states are just unbeatable compared to here so i end up there quite often. Our exchange rate is garbage right now those arms at 169.99 usd just cost me 257.32 cad

 

[bobthetj03]

That is crazy! Hope you get it sorted out.

 

[raphaelchicago]

ya thanks ill play around with those control arm when the come till the angles right thanks for your help

 

[raphaelchicago]

Is it safe to remove both of the upper control arms with the jeep on the ground to get the area all cleaned up while I wait for the new ones?

 

[bobthetj03]

Negative. Do one at a time.

 

[raphaelchicago]

so ive been messing around with the pinion angle does this look good?

 

[jjvw]

The angle finder needs to go on the differential and turned 90 degrees. Right now you are measuring rotation. Sort of.

In those images, is the axle hanging from the shocks or is that the normal ride height? The drive shaft looks too long.

Are the arms you installed adjustable?

 

[raphaelchicago]

the upper arms are adjustable it is on the ground at ride height. The driveshaft is 16.5- 18 inches and said it was for a 2-6 inch lift shouldnt be too long.

 

[S.McArthur]

I just went through this with an RC 4" X series Lift.
Measure here:

And Here on the back of the Differential:

 

[jjvw]

the upper arms are adjustable it is on the ground at ride height. The driveshaft is 16.5- 18 inches and said it was for a 2-6 inch lift shouldnt be too long.

I don't see splines for the slip joint. How much further can the driveshaft compress? What happens when the suspension moves up or down? Does the shaft stop the travel?

 

[raphaelchicago]

im not sure i havent been able to take it for a drive ill go take the other measurment thats those picutes showed and upload them

 

[tworley]

Whoa...way to long of a driveshaft. Also, it looks like the pinion could come up a touch more.

 

[S.McArthur]

That driveshaft looks sketchy as well, you could have gotten a Tom Wood's or Adams DS for cheaper.
Edit: Tworely beat me to this topic.