1991 GMC K2500 Sierra SLE 5.7L Transmission
Hello fellow Techs, This customer runs a weed spray service out of his truck. While he sprays he puts the truck in 4 lo. While he is in 4 lo the transmission will not up shift. We replace the input and output speed sensors, but did not fix the problem. Is ther...
FIX posted 6/22/2012
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Message Closed w/FIX
Vehicle Data1991 GMC K2500 Sierra SLE
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Message Closed w/FIX
Vehicle Data
1991 GMC K2500 Sierra SLE
VIN | 2GTGK29KSM |
Engine | 5.7 L / 8 cyl / GAS |
Trans | 4-speed Automatic |
Delivery | Fuel Injection |
Affected | Transmission |
Conditions | Will Not Upshift in 4Lo |