Pinion angle? - JeepForum.com
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post #1 of 25 Old 08-17-2017, 02:43 PM Thread Starter
Joc80
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Pinion angle?

Still chasing down high speed vibrations here. Replaced rear lower control arms, ujoints, front driveshaft, front track bar.... hmm what else lol

Can anyone tell just by looking if my pinion angle looks alright? I ordered a gauge to check but it wont be in til next week. Just want to see if someone thinks i am on tje right track.

Its a 95 GC Laredo with 2 inch lift. Its been vibrating since i bought the truck, so i dont know if its been doing it since it was lifted, or if this is something new....

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post #2 of 25 Old 08-17-2017, 02:44 PM Thread Starter
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No my truck isnt upside down haha. For some reason it posted my pic the wrong way
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post #3 of 25 Old 08-17-2017, 02:49 PM Thread Starter
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Oh i will add one more thing - starts to vibrate the whole truck at 90 kmh and up. Doesnt matter if i am on the throttle or in coast. If i go in a dip in the road (compresses the suspension a bit?) The vibration stops for a second. This is why i am suspecting pinion angle....
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post #4 of 25 Old 08-17-2017, 02:57 PM
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How's your Tire balance? 90KM/H is about 55MPH and that's when I used to get really bad vibration at high speeds. got my tires rebalanced and issue went away instantly.

Additionally, try removing front D/S. Unless you have the 249 TC. Do NOT remove front D/S on a 249.

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post #5 of 25 Old 08-17-2017, 03:01 PM
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Originally Posted by BorderWalker View Post
Additionally, try removing front D/S. Unless you have the 249 TC. Do NOT remove front D/S on a 249.
Only applies to '93-'95 249s. Zero harm done on the '96-'98s.

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post #6 of 25 Old 08-17-2017, 03:02 PM Thread Starter
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I tried a new set of tires off our xj and tried, still vibrates.

It has the 249 so that option is out
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post #7 of 25 Old 08-17-2017, 03:57 PM
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That rear pinion angle looks wrong, though I'd need to see the t-case to know. The input yoke on the diff should be parallel to the output yoke of the t-case for a stock driveshaft.



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post #8 of 25 Old 08-17-2017, 04:05 PM
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Originally Posted by kg6mov View Post
That rear pinion angle looks wrong, though I'd need to see the t-case to know. The input yoke on the diff should be parallel to the output yoke of the t-case for a stock driveshaft.



Jeepforum admins are a bunch of dicks.
Wow. Where did that come from?

Keyboard Tourette's syndrome?

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post #9 of 25 Old 08-17-2017, 04:41 PM Thread Starter
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Looking at that, i think my pinion angle is off.

I guess i need to invest in some adjustable upper control arms.

Heres another pic, to me it looks wrong....
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post #10 of 25 Old 08-17-2017, 08:32 PM
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Wow. Where did that come from?

Keyboard Tourette's syndrome?

GW
The forum is setup to filter some other forums (like the one that image came from) as if they were swear words. So the image didn't work until I shortened the URL so jeepforum couldn't tell where it was from.

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post #11 of 25 Old 08-17-2017, 11:01 PM
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Quote:
Originally Posted by Joc80 View Post
Looking at that, i think my pinion angle is off.

I guess i need to invest in some adjustable upper control arms.

Heres another pic, to me it looks wrong....

Yeap, definitely wrong pinion angle. Rear output should be around 6°-7° down from horizontal, so the rear pinion angle should be the opposite pointing up from horizontal.

As for kg6mov's comment, I do agree. After the owner change this forum has become a lot worse. Same thing for Pirate4x4.

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post #12 of 25 Old 08-18-2017, 07:03 AM
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Quote:
Originally Posted by Timo_90xj View Post
Only applies to '93-'95 249s. Zero harm done on the '96-'98s.
OP mentioned his is a 95.

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post #13 of 25 Old 08-18-2017, 08:33 AM
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So the pinion angle has changed with just a 2" lift?

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post #14 of 25 Old 08-18-2017, 09:23 AM
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Originally Posted by Joc80 View Post
Looking at that, i think my pinion angle is off.

I guess i need to invest in some adjustable upper control arms.

Heres another pic, to me it looks wrong....

If you're interested I'm selling a set of these that I purchased last year, I'm installing long arms this weekend so I won't be needing them.

http://www.ebay.com/itm/Upper-and-Lo...30nuHNux7TObXQ
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post #15 of 25 Old 08-18-2017, 09:42 PM Thread Starter
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Apparently the 2 inch lift changed the pinion angle! I tried a tcase drop today to just try to match the angles and see if that helps. I used 3/4 inch and it made no difference at all. I got my angle gauge today and if i am placing it right i am still off 3 degrees. Maybe drop to 1 inch? I would rather not drop, but it i can match the angles and its still vibrating like crazy then i will look somewhere else.

Like i said, it was like this when i bought it and i have no idea if the dude just lived with it (its pretty bad at 90kmh!) Or if this is something new....

It was nice playing with the aftermarket switches on the dash and figuring out it has an e-locker in the rear though lol
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