Could it be my pinion angle????
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12 Second Club
Joined: Apr 2003
Posts: 394
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From: Pa
Could it be my pinion angle???? I am getting alot of vibration and humming noise from under my car. just had 3.73's and a BMR adj. torque arm installed. the mechanic set my torque arm at 3-3.5 degrees. he set it while the car was in the air? do u do it that way? also the car was cool for 2 days now it hums like a bitch!! runs fine though. could it be my u-joints. please help!!!!!!!!!! thanks,,,,,,
Pinion angle needs to be set with load on all 4 tires.An aftermarket torque arm needs 0-2 degree's set in.If it has too much pinion angle it will vibrate and get worse the faster you go.
The whissle is probly the gears.Installed at the wrong pinion depth.
The whissle is probly the gears.Installed at the wrong pinion depth.
Off BMR Site http://www.bmrfabrication.com/instructions/ta001.htm
Set pinion angle using the following method:
· Make sure the rear end is loaded by either setting the car on the ground or letting the car rest on jack stands positioned under the rear axle.
· Place angle finder on the driveshaft and record the angle. Now place the angle finder on the rear end torque arm mounting plate and record the angle.
· Subtracting one angle from the other results in your pinion angle.(Ex: -2 rear end angle subtracted from 0 driveshaft angle = -2 degrees)
· Turn adjuster to achieve the desired angle.
· As a starting point, most F-Bodies seem to like the following initial settings: Automatics: 1-2 degrees negative, Manuals: 2-3 degrees negative
10. Once pinion angle has been set, tighten all jam nuts and rear bracket cross bolts.
Set pinion angle using the following method:
· Make sure the rear end is loaded by either setting the car on the ground or letting the car rest on jack stands positioned under the rear axle.
· Place angle finder on the driveshaft and record the angle. Now place the angle finder on the rear end torque arm mounting plate and record the angle.
· Subtracting one angle from the other results in your pinion angle.(Ex: -2 rear end angle subtracted from 0 driveshaft angle = -2 degrees)
· Turn adjuster to achieve the desired angle.
· As a starting point, most F-Bodies seem to like the following initial settings: Automatics: 1-2 degrees negative, Manuals: 2-3 degrees negative
10. Once pinion angle has been set, tighten all jam nuts and rear bracket cross bolts.
