1971 Chevy Monte Carlo Transmission will not shift past 1st

100,000 MILES • V8 • 2WD • AUTOMATIC
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CARLOSINTX
  • MEMBER
  • 1 POST
I took off a working transmission from one monte carlo and put it on my other monte carlo which did not have any power when going reverse, it also shifted hard.

Now the installed transmission will go in reverse but it will only go into first gear and won't go into the second gear.

The only thing I didn't switch was the convertor because when I installed the transmission there was about a 1/4 inch gap between the convertor and flywheel. I ended up putting washers to make up for the 1/4 space.

Should I remove the washers? If I do this there will be a 1/4 inch space between the transmission housing and the convertor, will this be a problem.

Should I replace the convertor with the original?
This 1/4 inch spacing will still be there.

What does the cable that connects from the carb to the inside the transmission do. One monte had it connected but the other did not.

Thank you
Apr 8, 2010 at 5:44 AM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
this could be a govenor stuck or a vacuum modulator bad or not working or both. the cable MUST be connected so that your transmission will shift properly. If you get ethe govenor unstuck great but it still may not work. I'd try the goenor first and make sure that the vacuum line to the modulator is connected and working or not leaking.
Apr 11, 2010 at 5:01 AM
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