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Dowshifting w/ a Detroit Locker

This is a discussion on Dowshifting w/ a Detroit Locker within the Drivetrain forums, part of the LSx Technical Help Section category; This happened a few months ago when the car was running, but I just remembered it. After I installed my ...

  1. #1
    Sold: LS1 '85 El Camino ls1camino's Avatar
    Join Date
    Dec 2005
    Laurel, Maryland

    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    Dowshifting w/ a Detroit Locker

    This happened a few months ago when the car was running, but I just remembered it.

    After I installed my 9" w/ Detroit Locker I went out for a test drive. While on said test drive, I downshifted coming to a red light, and the car started fish tailing, almost to the point of spinning out. I immediately pulled it out of gear and stopped with the brakes.

    I know the reason behind this is the new rear, but I don't know why...anyone care to enlighten me? If it is the norm with Lockers, then I won't worry, if it's not then I have a problem.

    2000 Pontiac Trans Am WS6 M6: 427ci LS3, Built T56, Moser 9" w/ 4.11 Gearing, Full Suspension, and 6-point Cage.
    2000 Pontiac Grand Prix GTP: Twincharged w/ a T67 Turbocharger
    2007 Chevrolet 3500 Dually Duramax: 3" Downpipe, Dual 4" Exhaust, EFILive Tuning

  2. #2
    James Bond Spikito's Avatar
    Join Date
    Aug 2007

    2001 3.8 Black - sold
    2000 SS Black M6

    did it red line? if so you mighta locked it up....

    or you could have torqued the drive shaft, and when it flexed back it broke the rear loose

    i dunno, lol

  3. #3
    Member Rk ws6's Avatar
    Join Date
    Apr 2009
    Hagerstown, Maryland, United S

    2001 ws6

    took me awhile to get used to my Locker there violent its normal aslong as you have no other noises than the normal clunky sounds from the locker

  4. #4
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Wherever life takes me

    02 35th LE Camaro SS

    Here is a decent site that explains the inner workings of different types of differentials.

    You may know already now, but I still found it to be useful.

  5. #5
    Manhattan Trans Am SHovV's Avatar
    Join Date
    May 2008

    Medium Blue Metallic
    '99 T/A-7.0L-6spd

    its because the locker is engaging and dissengaging the axles at different time. its normal

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