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Th400 issue
Just bought my first square body. 1979 k20. The guy took out the manual trans and put a TH400 in. The issue I'm having is when you give it gas the truck crawls forward give it more gas and it still crawls as of it was just ideling till it shifts. When it shifts to second it will pick up speed...- 79K20M
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- Replies: 5
- Forum: Transmission & Transfer Case
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31x10.5 with 3:73 gears.700R4 trans. What RPM will I have at 70MPH?- Latest: Hunter79764
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