trans

1971 CHEVROLET CHEVELLE
V8 • 2WD • AUTOMATIC
Avatar
DANETUMMONS
  • MEMBER
  • 1 POST
why does my trans not shift into 3rd gear until im going 55 or60 miles per hour
Apr 22, 2011 at 1:32 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
CARADIODOC
  • CAR REPAIR CONTRIBUTOR
  • 34,308 POSTS
Your transmission uses a vacuum modulator at the right rear right above the pan. Start by checking the vacuum hose and metal pipe going to it for leaks. If there is transmission fluid in that hose, replace the vacuum modulator.
Apr 22, 2011 at 1:39 AM
Advertisement
Avatar
HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
this shold be a 250 or350 transin thecar there area couple of things. first i wold check is the throttle pressure cable to see if it's adjusted properly, then check for a broken hose going to themodulator and on the engine. You may have a rusted pipe going down to the modulator as well. If it's any more than that then take it to a trans shop because the trans mayhave been modified, causing it to do this.
Jun 5, 2011 at 6:41 PM