BlackBird305

ok about 2 weeks ago i upgraded my rear...went from a 2.73 open to a 3.73 posi...i used an SLP torsen posi (take out) and Richmond 3.73's...after the install there was a very slight whine for about 7-10miles then it completely went away..well 2 weeks later the whine is back..doesn't start till 1,500 RPM's then gets louder as the RPM's increase...makes noise on deceleration till 1,500...the backlash was set twice and im pretty sure its right...help me please!..thanks

mtx28

check your tire pressure on both rear tires. to be more exact, raise the rear and measure the circumference of both.. if its off then it will make the rear whine cuse the two wheels are turning at a diff speed. did you use the right lube? hope it helps

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• 83 Z28-- not a pretty site to look at, 200k miles and im sure it was treated like a rental car every day of its sad life(before i got it).. sold, thank the lord
• 74 Z28-- 383/400, green on black. pretty clean. FOR SALE!!!

BlackBird305

ok thanks i'll check that...anyone else?

BlackBird305

checked the tire pressure and circumference and they're both right on...anyone else?

Jay727

Some gearsets aren't designed to be totally quiet, Richmond for some reason make more noise than others because their design is more for performance and longevity in exchange for more noise.
I'm not sure why it would change especially if you rebuilt the whole rear and replaced everything, you may want to check the pinion nut to be sure it didn't come loose. Keep an eye on it and if the noise continues to change then there is a problem. Just for reassurance you might want to pull the cover off and re check the contact pattern.

88 427 Camaro

Whine is usually caused from the gear pattern being set too much towards the toe. It is also worse on race gears. A tow pattern is stronger than a standard or a heel pattern, but noisier. A race gear is set with more of a deeper toe pattern (also a softer gear material) for strength at the sacrifice of noise and life.

Do you have a picture of the gear pattern?

Miles

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88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES,it is a 9 bolt & YES they are 3.73's, not 3.70. 4.11's to follow soon )
www.koolmeister.com

BlackBird305

so if the gears are set towards the toe is this ok?...i ask because u say it's a "stronger" pattern then a standard...sorry no pics of the pattern...thanks a lot

Jay727

Do you have gear contact pattern pictures?
I know west coast differentials website has them but I don't know the address. I found it here---

http://www.differentials.com/njtech.htm


right to the patterns here---

http://www.differentials.com/njinstall.htm



[This message has been edited by Jay727 (edited June 12, 2001).]