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C4 transmission was leaking if left sitting for a couple of weeks. Just had it overhauled and the problem is still there, plus a new one. When cold I have reverse but when the transmission is warmed up to operating tempature I lose reverse and it will not shift into high unless you let off the gas. According to the mechanic all pressure/vaccuum reading were ok. Does anyone have any suggestions.
 

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No question about it... take it back. It sound like it could be just low on trans fluid though. It takes a bit to get the fluid built up in the valve body. Once you get it to go into gear the valve body is pumped up with fluid and you shouldn't have any problems after that. If the fluid is low it runs out of the valve body and doesn't supply pressure to the ball bearings. This will keep it from shifting or staying into gear.
 
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