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Gears Whining REALLY BAD!

This is a discussion on Gears Whining REALLY BAD! within the Drivetrain forums, part of the LSx Technical Help Section category; Originally Posted by Cutlass All rear gears are helical cut no matter the applications. Spur and helical aren't interchangeable terms ...

  1. #21
    Member Z ROADSTER's Avatar
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    Quote Originally Posted by Cutlass View Post
    All rear gears are helical cut no matter the applications. Spur and helical aren't interchangeable terms either. Spur cut gears are straight cut gears.
    The difference between say Top fuel and OEM gears are the heat treatments. OEM gears are harder and more brittle and would basically explode in a top fuel car. Top fuel gears are soft and absorb shock load, but wear out faster.
    Oh ! Ok . All gears ? I've always heard that GM's M22 rock crusher transmission's had straight cut gears . That's why they were so noisy but very durable & would hold-up under those high horse-power 427/454 big blocks .
    Also since I have your attention , is it true that the OEM axles in our f-bodies do not come heat-treated ? And is that why the soft bearing surfaces of the axle ends grind grooves into it so easily , necessitating replacement so often ? Also , is that why aftermarket heat-treated & chrome hardened race axle shafts make noise ?

  2. #22
    Moderator Cutlass's Avatar
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    I meant all rear end gears are helical cut, however I probablly shouldn't say that because I suppose there are examples to prove me wrong.
    Yes I've heard of straight cut gears in manual transmission like the M22 and aftermarket T5's and that does indeed make them stronger.
    I've never heard any about the rear axles heat treatment or not. It would be interesting to know. I'm not sure how a chrome hardened axle shaft would be noisey.

  3. #23
    Rice Hungry GottaHaveLS1's Avatar
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    I dropped my T/A off at my guys shop. I was there when he took the cover off the rear and there were lots of metal shavings on the magnet. This was only after driving less than 40 miles after changing the fluid. He said the gears looked fine and nothing was loose (backlash was perfect). I called him later in the day and he told me that I blew a bearing in the rear end. He also told me that this could be the problem thats causing the noise so I had him order a new one. It was $47 and I'm picking it up tomorrow. what do you guys think?

  4. #24
    Just another Joe Eagle's Avatar
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    Its still going to grenade on you sooner than later... keep saving ur duckets for a new axle!

  5. #25
    Moderator Cutlass's Avatar
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    Bearings cause noise all the time in differentials, so yeah that most likely your problem. Question is how did it happen so soon??? Did he say if it was an axle bearing, carrier side bearing, or pinion bearing??

  6. #26
    Member intheclouds1977's Avatar
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    Proper breakin is VERY important for new gears. Did you follow the proper breakin procedures? If not, the differential will become excessively hot, possibly damaging gears and/or bearings. Could lead to gear whine as well. If you didn't follow proper breakin, this may be your fault and not the installer's or the product's.

    -------

    Fill with fresh gear oil. Drive for 20 miles without hard acceleration and at a steady speed. Do not exceed 60mph. Let the vehicle sit as long as it takes for the differential to become cool to the touch. Repeat procedure one more time.
    For the first 100 miles, do not exceed 60mph. After 500 miles, drain/refill with new gear oil. Your new gears are now broken in.
    Last edited by intheclouds1977; 05-29-2008 at 05:43 PM.

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