i just installed a 3.73 ring and pinion by richmond. followed all the directions and backlash is right. and so is pinion depth. i drove the car and i get a slight whining noise above 12-13 mph. it only whines when l accelerate coasting it's dead silent, and braking its dead silent. turning hard right it makes a slight whining, but hard left it doesnt make any noise. is this normal? l ran it for 10 miles and brought it home. l felt the diff and it wasnt unusually hot. in fact it was normal temp. is this a normal noise?

 

Yes. Richmond sacrifices noise for reliability. These gears are meant for race cars, not your grandmothers caprice.

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'97 Bonneville SSE

 

follow the break in instructions too

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I have Richmond 3.73's also... they whine too. After you break them in, change the lube to synthetic, either Redline or similar, use GM Posi lube with it. The Posi lube with the synthetic lube lessens the noise. At least it did for me

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86 SC, 305 LG4, TH700R4, SLP headers, 3" cat and exhaust. Mild cam 204/214, .423/.442. SLP shift kit, richmond 3.73's w/limited slip. Suspension Techniques Sway Bars, Globel West Wonderbar, Poly everything bushings, Metco LCA's, Lakewood Panhad Rod. 16" ROH, with Toyo 245's. For autocross, 16" IROC's w/bfg R1's... Nothing easy can be fun...

 

Those all whine a little bit, it sounds to me like yours is OK and you did a good job. Like the other posts said, the Richmonds trade off a little noise for extra strength.

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ok thanks a lot for the responses guys, l really appreciate it