why do th400's shift out of first so soon?
#1
Senior Member
Thread Starter
Join Date: Mar 2002
Location: fairborn, ohio
Posts: 586
Likes: 0
Received 0 Likes
on
0 Posts
why do th400's shift out of first so soon?
this has been buggin me since i got this tranny, even if you hold it in low 1 it will shift into second right around 4900rpm. i've heard all 400's do this. adjustable modulators don't fix it. oh well. i was just curious why gm made these trannies do this. i got a manual valve body for mine to put in soon anyways.
#2
Supreme Member
Join Date: Jul 1999
Location: Loveland, OH, US
Posts: 18,457
Likes: 0
Received 15 Likes
on
15 Posts
Car: 4
Engine: 6
Transmission: 5
Most shift kits cure that. I'm sure you've noticed that when it shifts that way it shifts so hard it knocls your teeth out... it uses the band instead of the clutches when it does that.
GM did it to protect motors from being over-revved.
GM did it to protect motors from being over-revved.
#3
Supreme Member
Join Date: Jul 1999
Location: Calimesa, California, U.S.
Posts: 3,462
Likes: 0
Received 42 Likes
on
29 Posts
If you hold the shifter in manual low, it will automatically go into second if the rpm,s go high enough. GM did this on all TH400's. If you want it to stay in 1st, then you will have to install the Trans-Go Performance Shift kit (400-1-2). This will leave the transmission fully automatic, but with the ability to hold 1st or 2nd to any rpm you like.
#5
Supreme Member
Join Date: Nov 1999
Location: NE
Posts: 2,860
Likes: 0
Received 2 Likes
on
2 Posts
Car: 82 camaro SC
Engine: 350
Transmission: 700r4
Yep, I was just going to add that the 700r4's will do that. With my old comp T/A's I had a burnout get out of hand while I held it in 1st gear--it shifted to second.
#6
Senior Member
Join Date: May 2001
Location: springfield,IL
Posts: 745
Likes: 0
Received 0 Likes
on
0 Posts
Car: T/A / Grand Am
Engine: 383 SBC
Transmission: glide
Axle/Gears: 9" ford 5.67
Originally posted by transfixleo
You 700 guys may be surprised to find that your will do that too! Not everyone notices this, depending on several factors.
You 700 guys may be surprised to find that your will do that too! Not everyone notices this, depending on several factors.
Thread
Thread Starter
Forum
Replies
Last Post
darwinprice
Organized Drag Racing and Autocross
17
10-11-2015 11:51 PM