TH400 Reverse Problems
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TECH Enthusiast
Joined: Dec 2001
Posts: 553
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From: Columbia, MD
TH400 Reverse Problems When shifting into reverse, there is a delay of up to 30 seconds before it will grab reverse. It's almost like the transmission has to "think" about it first. It's a real pain obviously, like when trying to make a 3-point turn.
Anybody know what would cause this "delay" to happen? It only does this in reverse, and I've tried two different shifters. Same problem. Also, this is a reverse manual valvebody with a transbrake.
Thanks.
Anybody know what would cause this "delay" to happen? It only does this in reverse, and I've tried two different shifters. Same problem. Also, this is a reverse manual valvebody with a transbrake.
Thanks.
This may me somewhat normal , Many builders will modify the direct clutch to use both chambers during its apply stock it contains two apply chambers and one is used for reverse and one for 3rd. the direct clutch is used in both 3rd and reverse in fact reverse is the low band on with the direct clutch applied. due to the large aea that must be filled when this mod is done its not uncommon to see and signifcantly delayed reverse engagment. Now it may be posible to reduce this time by enlarging some feed holes in the plate to allow more flow of fluid but this too will have the negative effect of a possible excessivly harsh reverse and 2-3 shift
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FormerVendor
Joined: Oct 2006
Posts: 3,123
Likes: 3
From: D-F/W
Originally Posted by Crunch
When shifting into reverse, there is a delay of up to 30 seconds before it will grab reverse. It's almost like the transmission has to "think" about it first. It's a real pain obviously, like when trying to make a 3-point turn.
Anybody know what would cause this "delay" to happen? It only does this in reverse, and I've tried two different shifters. Same problem. Also, this is a reverse manual valvebody with a transbrake.
Thanks.
Anybody know what would cause this "delay" to happen? It only does this in reverse, and I've tried two different shifters. Same problem. Also, this is a reverse manual valvebody with a transbrake.
Thanks.
How long has this been going on?
Does the brake hold good at the line?
I am curious why you have replaced the shifter... is there an engagement / alignment issue you are fighting there?
g
I think what you meant to say was center support. None the less it sounds like the trans needs to be opened up. I would get the car on stands or a rack and verify that you do not have an issue with the shifter. If all seems good get a buddy to sit in the car with his foot on the break while running and check reverse with the cable disconnected. Go from neutral to reverse and see if it makes a difference with the engagement. If not the shifter is not the issue. I think it might need to come out and be looked at. My suggestion would be to have a fresh paper ring and seal kit installed with clutches and bushings if needed. Good luck. Vince
Thread Starter
TECH Enthusiast
Joined: Dec 2001
Posts: 553
Likes: 0
From: Columbia, MD
Originally Posted by Ratchthed
How old is the unit?
How long has this been going on?
Does the brake hold good at the line?
I am curious why you have replaced the shifter... is there an engagement / alignment issue you are fighting there?
g
How long has this been going on?
Does the brake hold good at the line?
I am curious why you have replaced the shifter... is there an engagement / alignment issue you are fighting there?
g
I had the shifter replaced because the B&M hammer got very loose and also the handle would not stay tight.
From what you are all saying, it sounds like the tranny will have to go to a shop and get dropped and opened and freshened up. Kind of sad, when I don't even have a solid 20 passes on it.
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Staging Lane
Joined: Oct 2006
Posts: 60
Likes: 0
Originally Posted by Vince @ FLT
I think what you meant to say was center support. None the less it sounds like the trans needs to be opened up. I would get the car on stands or a rack and verify that you do not have an issue with the shifter. If all seems good get a buddy to sit in the car with his foot on the break while running and check reverse with the cable disconnected. Go from neutral to reverse and see if it makes a difference with the engagement. If not the shifter is not the issue. I think it might need to come out and be looked at. My suggestion would be to have a fresh paper ring and seal kit installed with clutches and bushings if needed. Good luck. Vince
Center support. yeesh, the sun is getting to me.
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