anyone have any th400 experience? trans brake question

phat_ridegt

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So i've never had a th400 before and im a little confused on the usage of the trans brake.

so my car engages great in forward gears, and seems to hold power, but reverse has a bit of a delay (3-5 seconds) and it almost seems like it slips.

i have read in several threads that some units with a trans brake and rmvb require you to put the gear selector in neutral and use the trans brake button to properly engage reverse.

anyone have any insight? im going to hook the brake up this weekend if i have time and see for myself but i thought id see if anyone on here has any thoughts?

:wavey:
 

Mook

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[MENTION=340]Eagle[/MENTION]
 

LikeABauce302

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It's pretty normal to have to engage the transbrake to go into reverse.

You can also use your reverse lights to trigger the solenoid. You will need a diode to keep the reverse lights from turning on when you use the button.
 

willizm

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As people have said, try N and engage brake. I can use both R and N with the brake button to go in reverse. It's an 80e though and a little different than the normal
 

daturbosix

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N + tbrake button is kinda normal. although i have had a few valve body setups that actually allowed me to use R
 

Eagle

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N + tbrake button is kinda normal. although i have had a few valve body setups that actually allowed me to use R
The Lentech VB in the Capri allows R to work without the solenoid, thank god or this car wouldn't have been able to go backwards for like 80% of the season last year. :roflpicard:

Most TH400 VB's that I've heard of require the button to go into R though.
 

Mr. SBF

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Most automatic's with Pro tree trans brakes need it to function. I think it's got a little to do with how you wire it in. I don't like wiring it through a relay because when done like that they tend have a tiny bit of delay. Instead of using a relay mines wired to a on/off toggle to arm the tbrake button.

[MENTION=122]phat_ridegt[/MENTION] are you activating the brake in neutral before you put it in reverse? If not that could explain the delay and slip...
 
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phat_ridegt

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[MENTION=122]phat_ridegt[/MENTION] are you activating the brake in neutral before you put it in reverse? If not that could explain the delay and slip...
not activating the brake solenoid at all. its not hooked up yet. i didnt realize i was going to need it yet.

the transmission is a coan unit that is freshened up, not sure what valve body is in it.
 

GIMPY

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depending on the valve body u sometimes need to use the trans brake in order to engage reverse.. even if reverse grabs without using the trans brake I highly recommend u not to do that. reason being u aren't getting full line pressure to engage the clutch pack properly. if u have questions or need some technical info pm me. my dads built hundreds lol
 

GIMPY

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As people have said, try N and engage brake. I can use both R and N with the brake button to go in reverse. It's an 80e though and a little different than the normal
normal...

hard parts between 4l80 and th400 are almost all identical besides a 4l80 having electronics and overdrive
 

willizm

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The brake I use is forward gear so I can stick it in 3rd, engage the brake, launch and trans shifts 1,2,3. No manual vb and keeps the stock shifter.
 

GIMPY

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That's the beauty of the 80e. Especially since u probably street drive the car alot
 

School Boy

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The Lentech VB in the Capri allows R to work without the solenoid, thank god or this car wouldn't have been able to go backwards for like 80% of the season last year. :roflpicard:

Most TH400 VB's that I've heard of require the button to go into R though.
This is exactly why I kept power steering in the mustang. I have to hold the TB button to go in reverse on my car. :rofl:
 

phat_ridegt

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Ended up having a pump problem due to me being a dumb ass and shimming the converter too tight...new pump should be here tomorrow and I'll get the trans back in sometime this week and wire up the brake.
 

phat_ridegt

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so i ended up having a damaged pump due to me completly having a brain fart with the converter/flexplate spacing.

fixed the pump and then fixed a leaking bellhousing (jw sfi bell) and now all gears engage perfectly even reverse. without the trans brake. not sure if it's bad on the transmission but it works flawlessly without the brake hooked up.

turns out the pump was leaking causing a pressure drop which caused the delayed engagment. cant wait to get this thing on the rollers soon!
 

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