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
Avatar
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 2:11 PM
Avatar
CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
make sure the shift modulator is getting vacuum.if yes replace the modulator.
Feb 13, 2012 at 2:28 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle