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Help breaking in 3.73....

This is a discussion on Help breaking in 3.73.... within the Drivetrain forums, part of the LSx Technical Help Section category; Next weekend I am going to drive a couple of hours to get my new gears installed in my A4, ...

  1. #1
    Senior Member clg82's Avatar
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    2000 Trans Am

    Help breaking in 3.73....

    Next weekend I am going to drive a couple of hours to get my new gears installed in my A4, they are 3.73 gears. The problem is I am driving a couple hours away to have them installed. Will driving so far back with them installed hurt them in anyway, and if so how can i counter this?

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    Member OreoLt1's Avatar
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    It's not reccomended to drive that far just after the gears are installed. The ideal break in is to warm the gears up with easy driving for 20-30 mins. then allow the to completely cool down. Then repeat the previous process untill fully cooled, then after that easy driving for the next 500 mi. or so.

    I have used this process on many vehicles that I have rebuilt including my own and have never had an issue with them unless the gears are in a 10 bolt with good tires and more than OE HP! A lot of guys will know EXACTLY what I'm talking about w/10 bolts!

    hope this helps

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    Member stephen02ws6's Avatar
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    red with black stripes
    2002 Trans Am WS6

    if you drive home right away on them they will be a little noiser. i had mine put in about an hour away and had to drive home after. they were noisy by the time i got home.

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    Senior Member clg82's Avatar
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    Quote Originally Posted by stephen02ws6 View Post
    if you drive home right away on them they will be a little noiser. i had mine put in about an hour away and had to drive home after. they were noisy by the time i got home.
    Did the noise go away after sometime? I really don't want to damage the gears by driving home with them freshly installed......it is mostly highway driving as well, if that makes a difference.

  5. #5
    Junior Member WSICK's Avatar
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    best way to do it is in cycles just like oreolt1 said. drive it between 20 -30 minutes then let it cool down completely, repeat the steps between 4-6 times and you should be good
    -Half Throttle Racing-

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    Senior Member clg82's Avatar
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    Quote Originally Posted by WSICK View Post
    best way to do it is in cycles just like oreolt1 said. drive it between 20 -30 minutes then let it cool down completely, repeat the steps between 4-6 times and you should be good
    How will i know if they are completly cooled down or not? i'm sure i could mark some landmarks on the way home every 2 hours lol

  7. #7
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Feel the diff cover and see if its hot?





  8. #8
    Senior Member clg82's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    Feel the diff cover and see if its hot?




    I am actually having a new TA cover installed as well, does that make a difference?

  9. #9
    Member stephen02ws6's Avatar
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    red with black stripes
    2002 Trans Am WS6

    no the noise didnt go away they still whine

  10. #10
    Member OreoLt1's Avatar
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    10 bolts are always going to have a little gear noise(the housing and the driveshaft also affect how loud the noise is)on acceleration or decceleration but the way you break it in and take care of it will determine how loud they will be and how long they will last!

    As long as they are shimmed and installed correctly!

  11. #11
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    red/beige
    1955 Chevy convertible

    break in

    I have been out of the car business for a while and am getting back in now. The last time I was working the cars was with the Grand National Buicks. Don't know what every one is running in the rear ends but after a rear end change I found that running a synthetic kept it much cooler during the break in. Some posi/limit slip rears are not compatable with synthetic fluids (ie they disolve the disc) so check with the manufacturer. 2 cents from an old guy.

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