Pinion angle causing vibration?
Thread Starter
12 Second Club
Joined: Dec 2004
Posts: 175
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From: Harrisburg PA
Pinion angle causing vibration? I was wondering if its possible if the pinion angle is set way off to cause an escalating vibration as your speed gets faster.
I had a new tailshaft bearing put in because my original walked out on me, and had new u-joints and the driveshaft balanced at the same time. All 4 wheels were freshly balanced as well but when i get on the highway as i get faster the vibration gets louder until its extremely loud into 100+ mph.
The only other things I had done around the time was I installed my torque arm, the bmr tranny mount that relocates the torque arm onto it instead of the tailshaft, and some lca's.
I had a new tailshaft bearing put in because my original walked out on me, and had new u-joints and the driveshaft balanced at the same time. All 4 wheels were freshly balanced as well but when i get on the highway as i get faster the vibration gets louder until its extremely loud into 100+ mph.
The only other things I had done around the time was I installed my torque arm, the bmr tranny mount that relocates the torque arm onto it instead of the tailshaft, and some lca's.
Thread Starter
12 Second Club
Joined: Dec 2004
Posts: 175
Likes: 0
From: Harrisburg PA
Well I drove the car for a while open header after installing it as well as having that tail bearing and driveshaft done so I wasnt sure which was causing the problem.
In my experience with short wheel base Jeeps where bad angles and stubby DS's are concerned concerned, if the angle is off you will get shakes just taking off from a stop then eventually get some vibes. The shaking and vibes comes from the fact that the two u-joints velocities don't cancel each other out like they would if the angles were near equal.
Get an angle finder and fix it, it is rather easy.
Get an angle finder and fix it, it is rather easy.
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There is a really good video on our front page describing how to set pinion angle on a torque arm car check it out www.bmrfabrication.com
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Verdad Gallardo Thread Starter
12 Second Club
Joined: Dec 2004
Posts: 175
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From: Harrisburg PA
so i just went out and checked my readings and heres what I got
Reading from the passenger side with positive being on my dial towards the front and negative towards the rear.
On Driveshaft = -1 degree
On Rear End = +3 degrees
So based on how it seems it needs to be calculated my pinion is +2? or is it +4
The car is not level i have the rear jacked up a little so i can get in there, and im jacking it on the pumpkin so it shouldnt effect the angles.
Reading from the passenger side with positive being on my dial towards the front and negative towards the rear.
On Driveshaft = -1 degree
On Rear End = +3 degrees
So based on how it seems it needs to be calculated my pinion is +2? or is it +4
The car is not level i have the rear jacked up a little so i can get in there, and im jacking it on the pumpkin so it shouldnt effect the angles.
Thread Starter
12 Second Club
Joined: Dec 2004
Posts: 175
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From: Harrisburg PA
got it adjusted tonight to -2 and what a difference, no hum/vibration at speed anymore and it seems noticably smoother as well. i also figured out what was causing my thump when i dart side to side, my panhard bar relocation bracket was loose and it was pivoting on the middle bolt because the top was loose and has a little play in the hole.
so all in all I am totally happy, now i just need to get the thing inspected.......tsp td's w/ no cats doesnt fly well with the inspectors!
so all in all I am totally happy, now i just need to get the thing inspected.......tsp td's w/ no cats doesnt fly well with the inspectors!
