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  1. #11


    My bad sorry for the bad info.
    2004 Chevy Colorado 2wd/4l60e/3.5 Inline 5
    6-PIAA 520 series yellow ion spot lights 85 watts each
    PIAA quattro fog lights w/extreme white/yellow ion bulbs
    Anzo projector headlights/LED turn signals
    LED underbodys 7-color/LED interior lighting
    JET stage 2 performance chip/Magnaflow exhaust S/S
    Recon Big Rig Lights/LED tail lights/3rd brake light
    Putco LED bed lights/BEDRUG
    Goodmark 2" rise Cowl hood/K&N fipk intake
    98-04' Blazer overhead console & floor console
    40/60/40 seat modified to 40/console/40
    33" Cooper Discovery A/T
    16" Pro Comp extreme alloy wheels

  2. #12

    Join Date
    Sep 2010
    everett, massachusetts


    It is confusing because at some point in time GM changed the RPO meaning of the positraction limited slip differentials.

    like my 1996 impala SS. the rear diff code is GU4 3.08 ratio G80 positraction limited slip. this is what GM now would call the G86. the diff in the impala has a clutch and is at all speeds all the time providing both wheels drive force of a limited amount [[slipage] which if measured is 50 ft LBS of rotating torque with one wheel on ice the other on solid ground.

    so when I got my 2000silverado I saw the RPO G80 and thought is was the same diff BUT NO !

    Gm for a time used G80 on all differentials that provided positraction this caused all the confusion .

    like to know when GM changed over to the G86.

    with the G86 diff I know from those that did experiment with synthetic oil, adding extra friction modifier etc that this causes the chattering and even a loss of positration. so it did not take long for these new impala ss 1994-1996 to stop this nonsense and put the proper 80-90wt GL5 gear oil with the 4 OZ of the GM friction modifier.

    GM used on many of these impala SS the wrong diff cover gasket. the gasket GM used blocked the wheel bearing drain back holes. if not corrected the rear wheel bearings would burn up and also damage the axle bearing surface from heat and wear.

    I still own the 1996 since SEPT 1995 and the diff never chattered ...I would not use the synthetic in a G86 diff with what those impala SS owners found out...they said the synthetic was too slippery..thats why the clutches did not work correctly.

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