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GM 4L80E Transmission Problem:
I have a 2000 model old style Chevy 3/4 ton with 350 engine and 4l80E transmission. Truck has 80K and transmission was serviced at 60K by GM dealer.
My transmission works properly in all gears on level roads. On a hill it will kick out of OD, it will not shift back to OD when the road levels out. When this happens, the shifts from 1 to 2 to 3 are harsh or jerky shifts not as normal. I can turn engine off for 15 seconds, then restart engine and transmission works fine, until I get to the next hill.
Have had codes checked by local auto parts stores, not GM dealership, but so far no defect codes are noted, also no engine service light has come on.
Could this be the cause of my transmission OD problem?
To prevent the OD from burning out (from constant 3-OD up and downshifting and straining the OD) when towing something under load, the trans will force itself out of OD into 3rd when it detects that the converter is not locking up, The factory converter has an internal clutch that controls the lockup of the torque converter, and this clutch's torque capacity is minimal. Hence, if the clutch is going bad, just the weight of the truck and torque required to pull it will force the TCC to unlock the converter and a downshift to 3rd will occur. It will soon be time to replace the converter.
Note: DTC 83 - Torque Converter Clutch |
email Fred T. Hart Jr.
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