What is the break in period for new rear gears?

Discussion in 'Transmission & Driveline Topics' started by US MARINE, Feb 22, 2005.

  1. US MARINE

    US MARINE Veteran Member

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    I have a Chevy 10 bolt 8.5 posi that had 3.55 gears in my Camaro, I'm currently having 4.10 gears installed and it will be finished this Friday. How many miles should I drive to break in the new gears, before I cut loose with the Horse Power?
    Also, should I change the rear fluid after so many miles?

    Thanks
    Rick

    ------------------
    1970 SS Camaro / 2002 Chevrolet S10 truck / 2001 GMC Sierra truck / Good ole GM muscle
    USMC 22 years "Outstanding"
    Retired spending all my time with my family "Priceless"
     
  2. Scatter

    Scatter Veteran Member

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    Not to sure about the breakin time, but you have any plans for those old gears? [​IMG]
     
  3. Mwilson

    Mwilson Veteran Member

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    I never paid that any attencion! oops, my break in was from piney green rd to hywy 258!
     
  4. rscamaro73

    rscamaro73 Administrator Staff Member

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    I heard about 500 miles, with various speeds her eand there, no loading it up (no fast take offs, steep hills, etc).

    After that - spin her up [​IMG]
     
  5. MacDaddy

    MacDaddy Veteran Member

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    Yep, 500 miles with no high torque bursts. Almost like breaking in a new engine.

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    Gordon

    1979 Camaro Berlinetta
     
  6. craggar

    craggar Veteran Member

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    I never had a problem with gear sets and my buddy who builds them says if it doesn't make any weird noises going around the block you good to go.Always worked for me.
     
  7. big gear head

    big gear head Veteran Member

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    Let the car sit with the rear end on jack stands. Run it in drive and reverse for about 5 minutes in each direction to get the oil circulated well. Check the oil level. Put it on the ground and drive it easy for about 10 minutes. Let it sit until the rear end completely cools. Drive it again for about 30 minutes and let it cool again. Drive it normal for a few days and then drive it how ever you want. Gears in a tow vehicle need a longer break in, about 500 miles, before towing anything. You will notice that the teeth on used gears are smooth and shiny, while the teeth on new gears are slightly rough. You just want to give the gears time to get smooth before abusing them too much.

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    Byars Performance LLC
    High Performance Drive Train Parts And Service
    www.lubedealer.com/biggearhead

    [This message has been edited by big gear head (edited February 23, 2005).]
     
  8. US MARINE

    US MARINE Veteran Member

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    Thanks everybody for the info, I would hate to tear up a new set [​IMG]
    Big Gear Head, if my 3.55 are in good shape,how much should I sell them for?, and what is the best way to ship them ?

    Thanks Rick



    ------------------
    1970 SS Camaro / 2002 Chevrolet S10 truck / 2001 GMC Sierra truck / Good ole GM muscle
    USMC 22 years "Outstanding"
    Retired spending all my time with my family "Priceless"
     
  9. big gear head

    big gear head Veteran Member

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    I usually sell good used gears for around $50-$75 with no guarantee that they will not make noise. Stick them in the box that your new gears came in and use UPS, USPS or FedEx to ship them. Clean off as much gear oil as you can. If the shipping people see any sign of oil they freak out.

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    Byars Performance LLC
    High Performance Drive Train Parts And Service
    www.lubedealer.com/biggearhead
     
  10. COPO

    COPO Veteran Member Lifetime Gold Member

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    If you have posi, don't forget to go to an empty parking lot and do long and short figure 8's to circulate the fluid well. I $hit you not.

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    Mark D
    1970 Z28
    http://http://ca.geocities.com/mlvd@rogers.com/
    WTB: 70 SS396 Chevelle 4-spd, flapper hood car, no rag tops, 1-2 owner car.
     

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