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There could be a number of possible reasons why your G30 Chevy van is not shifting out of 1st gear. Some potential causes could include:
Faulty shift solenoids: The shift solenoids are responsible for controlling the flow of transmission fluid through the valve body, which in turn affects the shifting of gears. If the solenoids are not functioning properly, it can cause the transmission to get stuck in 1st gear.
Low transmission fluid pressure: If the fluid pressure in the transmission is too low, it can prevent the gears from shifting properly.
Faulty transmission control module: The transmission control module (TCM) is responsible for controlling the shifting of gears in an automatic transmission. If the TCM is faulty or has malfunctioned, it can cause the transmission to get stuck in 1st gear.
Internal transmission issues: There could be internal issues within the transmission itself that are preventing it from shifting out of 1st gear. This could include worn gears or clutches, or other mechanical issues.
It is recommended to take your van to a qualified mechanic or transmission specialist to diagnose the issue and perform any necessary repairs.
the overdrive is the 4th gear. considering that it may not be an issue with your computer switching gears to fourth but an issue with the transmission itself. this light could be a signal instead of and engine warning light where the engine is fine but the transmission isnt.
as a quick remedy 1st check your fluid make sure is clean and leveled/adjust your kick down cable for early shifting by loosening the cable till you establish the right shifting
You most likely have a broken sunshell inside the transmission. They tend to go out when the transmission is shifted to drive when while still rolling in reverse.
It sounds like the bands inside the transmission are burnt. one way to check is pull you trans dipstick and smell the fluid and see if it smells burnt and the fluid should also be bright red. i have burnt a few trans myself and they did that.lol
Have you tried taking the car in for maintenance? Usually on most (older) auto transmissions there is a hose coming off of the exhaust manifold or carburetor area that provides the pressure for the transmission fluid. If that hose doesn't have a good seal, your shifting may be difficult and the transmission may not stay in the gear you want it to.
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