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4 Speed Transaxle Info

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    robertisaar
    W-Body for Life!

  • 4 Speed Automatic Transaxle Info

    The following pages contain information on specific transmission models from the 4T60, 4T60E and 4T65 family(4T40/4T45 and 4T80 information may be in the works, stay tuned). For now, it is NOT an all-inclusive list, but any missing information would be appreciated.

    Miscellania:

    4T60E Differentials with an asterisk are "fine pitch" final drives. Sun gears, internal ring gears, and pinion gears are NOT interchangeable with other final drives.

    4T65E with "IMS" have the newer type of shifter position sensor, called the "Internal Mode Switch", as opposed to the style found on 4T60E and early 4T65E transaxles.

    4T65E Stall Speed Info:

    these are approximate stall speeds based on the K-factor and TC size. YMMV, but they should give a good estimate as to which ones will stall higher or lower.

    245-115 = 1340
    245-163 = 1900
    245-177 = 2060
    245-180 = 2100

    258-115 = 1410
    258-133 = 1630
    258-155 = 1900
    258-164 = 2010
    258-179 = 2200

    4T80 General Info:

    Maximum Engine Torque: 300 Ft-Lb
    Maximum Gearbox Torque: 461 Ft-Lb
    Maximum Gross Vehicle Weight: 4750 Lb
    265mm Torque Converter
    269 Lb Dry
    295 Lb Wet
    15 Quart Capacity

    gearing:
    2.69
    1.626
    1.0
    .681

    39/39 Chain Ratio
    Differentials: 2.84, 3.11, 3.48, 3.71

    maximum shift speeds: 6400RPM

    All have a 39 tooth input speed reluctor?
    All have a 31 tooth output speed reluctor(VSS)?

    1995 G-Body(Aurora) 4T80E
    AKN 3.48:1 FDR (has higher shift points)
    ZYN 3.71:1 FDR

    1997-up
    G:
    MDN (has higher shift points)
    MSN

    1997-up
    E & K: AAN(has higher shift points)
    K: MLN

     
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