C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

automatic trans problem

Thread Tools
 
Search this Thread
 
Old Sep 1, 2014 | 06:47 AM
  #1  
woodvette03's Avatar
woodvette03
Thread Starter
Instructor
10 Year Member
 
Joined: Dec 2009
Posts: 208
Likes: 6
From: Baltimore MD
Default automatic trans problem

have not driven my '76 since last year. finally was able to get it out yesterday. pulled out on the road and the trans would not shift to next gear. went right back home and checked the fluid. a little low so i added some. went back out on the road and the same thing. would not shift. fluid was nice and red, no burning smell. last time i drove it last year it was fine. any thoughts?
thanks in advance for the help.
Reply
Old Sep 1, 2014 | 08:14 AM
  #2  
JimT's Avatar
JimT
Burning Brakes
10 Year Member
 
Joined: Nov 2006
Posts: 893
Likes: 7
From: Orange Park Florida
Default

If your trans is a th400 check vacuum hose to modulator, and you may have a bad détente relay in the tranny. Not a bad fix but you have to remove the tranny pan. Do a search on the forum for th400 shifting issues. Part is less than $20.
Reply
Old Sep 1, 2014 | 11:54 AM
  #3  
lvmyvt76's Avatar
lvmyvt76
Melting Slicks
 
Joined: May 2011
Posts: 2,753
Likes: 119
From: Springfield Missouri
Default

if the trans is a 350 like mine, pull the hose off the modulator, see if fluid comes out, if it does , replace it.
Reply
Old Sep 1, 2014 | 08:11 PM
  #4  
woodvette03's Avatar
woodvette03
Thread Starter
Instructor
10 Year Member
 
Joined: Dec 2009
Posts: 208
Likes: 6
From: Baltimore MD
Default

crawled under the car and found that the vacuum line fell off the modulator valve somehow. pushed it back on and now she is shifts fine. thanks for the help guys!
Reply

Get notified of new replies

To automatic trans problem





All times are GMT -4. The time now is 01:37 PM.

story-0
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-1
2027 Corvette vs The World: Every Model vs Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-20 17:58:41


VIEW MORE
story-2
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-3
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-4
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-5
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-6
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-7
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE
story-8
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!

Slideshow: Breaking down the 2027 Grand Sport, Grand Sport X, Stingray, and LS6 V8.

By Michael S. Palmer | 2026-03-26 13:48:45


VIEW MORE
story-9
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!

Slideshow: 5 reasons bad drivers crash sports cars & 5 ways to avoid a costly shame!

By Joe Kucinski | 2026-03-25 16:32:55


VIEW MORE