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Old 02-22-2012, 05:40 PM
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GM 350 trans problem

I just finished putting together a project that was started by a previous owner 25 years ago. It's a 1949 International KB-1 on a 1977 Chevy 4X4 chassis. It is now running fine but heres the problem. When shifting from park to drive, the trans hits so hard it kills the engine. It only does it when shifting to drive. Shifting from park to reverse is fairly soft and the engine will idle fine. The truck will run and drive once you have mastered the art of throttling and shifting at the same time. The trans will shift into second gear normally, not too harsh. I'm hoping it's a stuck spring or check ball in the valve body. I'd rather not have to pull the trans to repair. Any help is appreciated.


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Old 02-23-2012, 07:28 AM
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Possible high engine idle....broken motor mount.... check for vacuum leaks....pull the line off the modulator,see if any ATF comes out of it....and you didn't mention that you got a 2-3 shift out of it...if all is well so far,then you should put a 0-300 pressure guage on it , and check for high mainline pressure..... thats the only easy internet suggestions I can give you without actually having the truck on my lift on this problem.You could look for a loose u-joint or excessive play in the driveshafts,but that usually results in a harsh reverse also,but since you're under there anyways...

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Old 02-23-2012, 07:14 PM
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Thanks, I will try your suggestions.
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