TH 400 Won't Shift Under Heavy Load
Thread Starter
Racer
Joined: Apr 2012
Posts: 340
Likes: 37
From: Plymouth, Ma
TH 400 Won't Shift Under Heavy Load
My '68 Vette just came back from the shop for "other" repairs. Now, out of nowhere, the tranny won't shift when I put the accelerator to the floor. It's fine at normal speed, but once I "Get On " her....It revs to the red line, and HOLDS!!!
Mechanic says everything is fine...(Of course) Never happened before. If I put the metal down, it always took off, shifts...1,2,3 no problem..Now? Only at slow speeds
Anybody...Help!!! Bringing her back in tomorrow.
Thx,
Bob
Mechanic says everything is fine...(Of course) Never happened before. If I put the metal down, it always took off, shifts...1,2,3 no problem..Now? Only at slow speeds
Anybody...Help!!! Bringing her back in tomorrow.
Thx,
Bob
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I would suspect the vacuum modulator or the line to it first. Usually, when the vacuum is off it won't hardly shift at all anytime. But it's an easy place to start looking.
Burning Brakes
Joined: Oct 2003
Posts: 836
Likes: 26
From: Harrisburg Pa
could be a couple of things but my first thought is the governor
or the gov screen is cloged.
I found this for you.
http://www.dragracingonline.com/tech...vi_9-bm-1.html
or the gov screen is cloged.
I found this for you.
http://www.dragracingonline.com/tech...vi_9-bm-1.html
