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Thread: 2002 4.8 and auto trans issues

  1. #1
    Join Date
    Dec 2003
    Location
    Yukon Canada
    Posts
    1,194

    Default 2002 4.8 and auto trans issues

    Hi All
    i have a gasser p/u that i got from auction.
    Now that the weather has turned colder the tranny has an issue...
    When i start the truck in the cold if i go to backup it takes a while before reverse kicks in.Forward gears are fine the engage without any hesitation.
    Idea's or direction please...
    Thanks All
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  2. #2
    Join Date
    Mar 2000
    Location
    South Central Pennsylvania, USA
    Posts
    2,660

    Default

    First check would be fluid level and condition - is it where it is supposed to be and is it clean?
    '94 GMC 6.5TD K1500 4L80E 2-Door Yukon SLE 221K
    '93 Chevrolet 6.5TD K2500HD NV4500 Std. Cab Longbed 187K
    '85 Toyota 22R RN60 4x4 Std. Cab Shortbed 178K (Currently retired for rebuild)
    Diesel Page Member #2423

  3. #3
    Join Date
    Dec 2003
    Location
    Yukon Canada
    Posts
    1,194

    Default

    Yup it's good
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  4. #4
    Join Date
    Feb 2000
    Location
    Montana
    Posts
    10,743

    Default

    The Allison in my 2001 GMC set the "MIL" warning lamp following the coldest overnight low we experienced last winter. The MIL would come right back after clearing the codes - I cleared them many times - they always came right back. The fluid level and color/condition were great.

    The solution came as a result of what we always recommend as a first step when troubleshooting most transmission problems... a full service. Changing both fluid filters, along with what fluid drained as a result of changing the filters, solved the MIL problem. A series of trouble codes had been set. I'll have a short tech page soon that talks about the codes and the trans service.

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