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1994 GMC C1500 Sierra SL 5.0L Lock Up, Early Shift
Posted to GM Transmission on 2/27/2009 6 Replies

this truck shifts very early, right in and out of lock up as low as 30kph. speed reading on scanner is eratic jumping from actual speed (35) to 90mph and back. speedo indicates proper speed and doesn't jump. Tried used speed buffer but no change. disconnected ...

6 Replies Received (View Replies)

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car Vehicle Data

1994 GMC C1500 Sierra SL

VIN 1GTDC14H1R
Engine5.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
AffectedLock Up, Early Shift
Message Closed

car Vehicle Data

1994 GMC C1500 Sierra SL

VIN 1GTDC14H1R
Engine5.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
AffectedLock Up, Early Shift