Desperately need help with pinion angle
Thread Starter
Staging Lane
Joined: Nov 2001
Posts: 61
Likes: 0
From: Southlake, TX
Desperately need help with pinion angle I need some help with setting the pinion angle. I did a search and didn't find what I'm looking for. I installed a Moser 12-bolt, Denny's D/S, Random Tech torque arm, Spohn LCA and adjustable PHR. I've gotten so much advice that I'm totally confused. I'd like to go back to the basics. How do you measure the angles? Where do you set the angle finder?
If I understand what I measured my DS angle is +3 degree's and my pinion angle is -5 degree's. I checked this by putting the angle finder on the DS towards the pinion next to the weld. I measured the pinion angle across the pinion and accross the torque arm where it bolts to the diff.
Can someone please help me?
TIA
-Allen
If I understand what I measured my DS angle is +3 degree's and my pinion angle is -5 degree's. I checked this by putting the angle finder on the DS towards the pinion next to the weld. I measured the pinion angle across the pinion and accross the torque arm where it bolts to the diff.
Can someone please help me?
TIA
-Allen
Re: Desperately need help with pinion angle Ideally, you want 1-2 degrees nose down on the pinion angle. That means the pinion angle (measure at the pinion yoke face or machined part of axle housing perpendicular or parallel to pinion) is 1-2 degrees pointing downward from the driveshaft angle.
If the driveshaft is 3 degrees, the pinion angle should be 1-2 degrees. See, they're both still going uphill toward the engine, it's just that the axle is pointing 1-2 degrees shallower than the driveshaft. Simple enough?
If the driveshaft is 3 degrees, the pinion angle should be 1-2 degrees. See, they're both still going uphill toward the engine, it's just that the axle is pointing 1-2 degrees shallower than the driveshaft. Simple enough?
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Re: Desperately need help with pinion angle The way I set it on my car was to put the angle finder on the flat part of the torque arm where it hooks to the rear end and read the angle. the put it on the driveshaft and measure the angle there. the difference in the two is the pinion angle. Make sure that you do this with the car jacked up by the rear end with the suspension fully loaded. Normally -1 -2 degrees on an automatic car and -2 to -3 on a 6 speed car
L8r
Will
L8r
Will
Thread Starter
Staging Lane
Joined: Nov 2001
Posts: 61
Likes: 0
From: Southlake, TX
Re: Desperately need help with pinion angle Patrick and Will, thanks for the advise. I spent most of the day adjusting and test driving but got it pretty close. I made the mistake of ASSuming that the DS was measured in negative degree's. Once I got it right I was about 9 degree's negative. Now I'm running -1. I rowed through four gears (120mph) and things felt pretty smooth. I have no vibration in gears 1-5. When I change from 5th to 6th at 70mph the vibration is noticeable. Any idea why? I have none in 5th but do in 6th.
TIA
-Allen
TIA
-Allen
Staging Lane
Joined: Nov 2001
Posts: 69
Likes: 0
From: Uvalde Texas
Re: Desperately need help with pinion angle Hey guys, Ill be adding an adjustable torque arm soon and woud like to know what kind of angle finder Ill need and where to purchase one. I understand the procedure thanks to your help i just need to get the right tool for the job.
