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71' Chevy transmission
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hoosier1
New User
| Posts: 1
| Joined: 11/07
Posted: 11/15/07
05:48 AM
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My son and I have swapped out the oringinal TH350 tranny in our 71' Chevy truck for an updated TH400 (Came out of an 80's Chevy van). We had to shorten the driveshaft. The truck has to reach very high RPM's to shift in second (Late shifting) and verily shifts to 3rd. I was told the TH350 was mechanical and the TH400 was electronic which may need a TV cable (Throttle Valve)? Any suggestions?
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haysonj
New User
| Posts: 46
| Joined: 10/07
Posted: 11/15/07
06:24 AM
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My turbo 400 shifts off engine vacuum and the passing down shift is electrical from a switch on the carb. you might check the vacuum line and modulater on the trans
1969 CK20 383 power
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