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Old 09-20-2003, 11:03 AM
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Rear end hum after new gears and carrier

Hi,

I just had a set of Richmond gear 3.55's and an Eaton posi installed in my posi GM 10-bolt rear end.

The rear end hums when I'm in a right turn and either coasting or braking. If I hit the gas during the turn, the hum goes away. Other than that, everything's quiet.

Any ideas as to why it's doing this and should I take it back to the shop where the work was done?

Thanks for your help!

Brian

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Old 09-21-2003, 07:29 AM
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it sounds like a gear noise, but some after market gears are a little noisey, but richmond gears are usually good. what spec did you use ,
pinion preload new bearings 20 -25 inch pounds of rotating torque, used bearings 10 -15 inch pounds rotating torque. back lash .006 - .008 thousands of inch and did you check pinion depth, you have to have special tool for this procedure.the rule of thumb always reuse the same thickness shim for the pinion depth. carrier cap bolts torque 60 ft lbs
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Old 09-21-2003, 07:37 AM
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Take it back, it is set up wrong, 3.55 gears should be as quiet as any stock rearend. If you continue to use it you will cause extreme abnormal pattern wear and the gear is then junk, make sure the shop knows what they are doing, rear setup is a specialized job that most general repair shops can't handle correctly. I'v had to re-set plenty of these after other shops incorrectly installed them.
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