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pinion gear?

This is a discussion on pinion gear? within the Drivetrain forums, part of the LSx Technical Help Section category; whats up guys, there's a humming noise coming from my rear end that is loudest when i accelerate and decelerate.my ...

  1. #1
    Junior Member pdiddyz28's Avatar
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    navy blue
    1998 z28 m6

    pinion gear?

    whats up guys, there's a humming noise coming from my rear end that is loudest when i accelerate and decelerate.my friend and my mechanic think its probably the pinion gear and bearing.Also two weeks ago when it was at the shop my mechanic said the pinion seal is leaking (again) cuz i had it changed last year and he said that's usually sign of bigger problems like the pinion gear and or bearing.

    i was wondering if i should have the pinion gear and bearing changed or just throw in a whole new (meaning used) rear end.Cuz people say its risky and you're taking a chance rebuilding it cuz it hardly ever works right afterwards.

    oh, also i know its not a wheel bearing making the noise! thanks guys!

  2. #2
    James Bond Spikito's Avatar
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    2001 3.8 Black - sold
    2000 SS Black M6

    welcome to owning an f-body....

    since it only makes noise when the gears are under strain, id say the noise is coming from where the ring and pinion actually interact, just like all the rest of ours do.

    We have loud rear ends, just the way it is.

  3. #3
    Member jrgswhitels1's Avatar
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    Black
    1993 Camaro Z28

    New bearings and races and you should be OK, so long as you set pinion nut at the same setting as it was. Torqueing it down too much/little and the rear will whine and over heat.
    1993 Black Camaro Z28 LT-Won

  4. #4
    Senior Member JayTA98's Avatar
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    Mean Black
    1998 Trans Am

    make sure that you don't have a worn axle. I had noise in my rear end and when I pulled the axles out one of them had damage were the bearing sits at. I put a repair bearing (or replace it with a new axle) and replaced the other side's bearing and the noise is gone.

  5. #5
    Auto Painter RyanJM's Avatar
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    1998 Trans Am

    I chewed up the factory 3.23's in my 98 A4 TA just got some new gears and a rebuild kit and worked great for a couple more years before it started humming loud again so I tossed in some 3.73's with another rebuild kit and been ok for 2 yrs although it is a little loud. I plan to swap to a better rear when I have the cash but the the ring and pinion gears. Usually a set a motive gears and a ratech rebuild kit will get you by till you can eventually buy a more solid rear.
    1998 Trans Am 85k miles.
    Bolt ons, MS3 113LSA cam, Circle D Stall, Tune, Modified WS6 style hood, Full Suspension, 6000k HID's, Clear Side Markers w/ Leds, Led 3rd Brake Light and 18" AR Staggered Killer Wheels w/ BFG KDW NT's.- Weekend Toy/DD
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