Check Pinion Angle

criddy · 08-02-2009, 03:53 PM

I just installed a Teraflex 3 inch spring lift but actually got 4 inches. I did the transfer case drop because I don't have a SYE yet. This was my first experience with work on my jeep. I learned from the Jeep Forum how to install the lift and tried to educate myself on lifts and the affects they have on other components. Since I have never looked at a pinion angle I just want to be sure its correct. Thanks for all you knowledge that you post on the forum it is very helpful to newbies

Transfer case 231, Dana 44

[IMG]

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Angle is 10

Angle is 12

**-sean-** · 08-02-2009, 03:57 PM

Your fine.

**Knuckelhead** · 08-02-2009, 04:12 PM

Did you check the pinion angle? None of your pictures show that...

**Jerry Bransford** · 08-02-2009, 04:14 PM

The pinion angle needs to be exactly the same as the transfer case's output shaft angle with that type of driveshaft. Definitely never any higher and as low as 1-2 degrees under that of the t-case output shaft. It may be the photo angle but it looks like someone raised the pinion angle up to match the driveshaft which is incorrect and can cause vibes.

criddy · 08-02-2009, 05:44 PM

Jerry,
So, can I fix this with adjustable upper rear control arms?

**-sean-** · 08-02-2009, 05:55 PM

Are you getting vibes?

criddy · 08-02-2009, 05:58 PM

a little with decel at around 10-15 mph and less. I just don't want to damage anything by leaving it if its not correct.

**Knuckelhead** · 08-02-2009, 06:08 PM

Adjustable uppers will allow you to correct it, you'll need them also when you do get an SYE and new driveshaft...

**-sean-** · 08-02-2009, 06:14 PM

Quote:

Originally Posted by Knuckelhead

Adjustable uppers will allow you to correct it, you'll need them also when you do get an SYE and new driveshaft...

X2

Good to have no matter what.

Sounds like your good for now and running it that way isn't going to hurt anything in the mean time as long as your not getting a bad vibe. Are you sure the vibe you described is coming from the rear? I only ask because most folks get them constantly and under a load, not during deceleration.

**Knuckelhead** · 08-02-2009, 06:36 PM

And how about that pinion angle measurement?...

**-sean-** · 08-02-2009, 06:57 PM

Quote:

Originally Posted by Knuckelhead

And how about that pinion angle measurement?...

I was wondering about that too, you took a measurement at the pinion but you put the angle finder on the shaft, not the pinion yoke.

criddy · 08-02-2009, 06:57 PM

The angle on the transfer case is 8 deg.. The bottom of the diff is 18 deg.

**-sean-** · 08-02-2009, 07:00 PM

Quote:

Originally Posted by criddy

The angle on the transfer case is 8 deg.. The bottom of the diff is 18 deg.

Are both of these measurements taken on the yokes?

criddy · 08-02-2009, 07:07 PM

I rechecked it. The yoke from the diff is 12 deg. the yoke from the transfer case is 10 deg

**bddisi** · 08-02-2009, 07:28 PM

Like stated earlier, your rear pinion looks too high. Yes adj uppers would allow you to correct it. Did your lift come with cam bolts? I don't know if you could get enough adjustment from those to help or not, I do know they are a lot less $$$ than adjustable uppers.

08-02-2009, 03:57 PM	#2
-sean- newb Join Date: Mar 2001 Location: Colorado Posts: 842 Profile Gallery Classifieds My Jeeps	Your fine. __________________ ... keeping an eye on you guys.

08-02-2009, 05:55 PM	#6
-sean- newb Join Date: Mar 2001 Location: Colorado Posts: 842 Profile Gallery Classifieds My Jeeps	Are you getting vibes? __________________ ... keeping an eye on you guys.