My 1997 Chevy 3500 2wd truck with a 350 ci engine and a T-400 automatic transmission sometimes doesn't shift.

1997 CHEVROLET TRUCK
88,000 MILES
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DRAGONFLY73
  • MEMBER
  • 1 POST
Sometimes it runs and shifts fine and sometimes it wont get out of first gear. It will go but it stays in first gear and the RPM's get high. Reverse works fine. Its hit and miss every time I get in it I'm not sure if its gonna run good or act up. What could be the problem? Thanks!
Feb 13, 2012 at 10:11 PM
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CADIEMAN
  • ✓ASE Certified Mechanic
  • 3,544 POSTS
  • ASE Certified Mechanic
make sure the shift modulator is getting vacuum.if yes replace the modulator.
Feb 13, 2012 at 10:28 PM
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