TH400 setup for autoshifting...questions

[Wahoo]

Just picked up a th400, only has a b&m transgo shift kit, so still auto valve body that i can shift manually if i want, any recommendations on speedo gears or govener adjustments? Im a transmission noob. Going to maybe fab up the linkage for column shift for now..

Im worried about the pump pressure taking out the thrust bearing not sure if i need to modify anything to prevent this or if it is a real problem?

Also need to pick a converter, car is a hot air, TA33 turbo, downpipe, uppipe e85. Stall recommendations?

Thx

 

[jckcolarusso]

The cooler line pressure has to be checked u don't want it over 40 psi if it's is hutch transmission has the fix

 

[jckcolarusso]

I would make it a manual valve body with a t brake

 

[Wahoo]

The cooler line pressure has to be checked u don't want it over 40 psi if it's hutch transmission has the fix

Is there tools i can buy to check the pressure?

How would i adjust the pressure?

 

[Wahoo]

I would make it a manual valve body with a t brake

Maybe one day. Im just trying to have it driveable and trackable this year. I might get a 3000 stall for now

 

[jckcolarusso]

I'm at work when I get home I'll send u a picture where I checked mine and the pressure gauge I used to do it your converter selection will be a huge part of it and the will depend on a lot of things turbo cubic inch weight of the car and so on

 

[turbobitt]

Just picked up a th400, only has a b&m transgo shift kit, so still auto valve body that i can shift manually if i want, any recommendations on speedo gears or govener adjustments? Im a transmission noob. Going to maybe fab up the linkage for column shift for now..

Im worried about the pump pressure taking out the thrust bearing not sure if i need to modify anything to prevent this or if it is a real problem?

Also need to pick a converter, car is a hot air, TA33 turbo, downpipe, uppipe e85. Stall recommendations?

Thx

The general consensus is that on a modulated pressure regulated auto shift trans you will probably be OK without modifications. This begs another question as to how you plan to manage the vacuum modulator ?
AG.

 

[Wahoo]

I'm at work when I get home I'll send u a picture where I checked mine and the pressure gauge I used to do it your converter selection will be a huge part of it and the will depend on a lot of things turbo cubic inch weight of the car and so on

The general consensus is that on a modulated pressure regulated auto shift trans you will probably be OK without modifications. This begs another question as to how you plan to manage the vacuum modulator ?
AG.

What do i need to do? Im trying to research that now, i know i need a check valve but i dont understand how wheh vacuum is applied to the transmission how it effects it. I mean once i start to build boost vacuum lowers until it becomes a positive pressure, unless the check valve will keep all the max vacuum the engine first starts to produce?

 

[turbobitt]

The vacuum modulator controls the line pressure. I never ran an auto shift but some run the manual linkage conversion in place of the modulator.


Sent from my iPhone using Tapatalk

 

[Wahoo]

The vacuum modulator controls the line pressure. I never ran an auto shift but some run the manual linkage conversion in place of the modulator.


Sent from my iPhone using Tapatalk

Where can i find the manual linkage modulator?

 

[jckcolarusso]

No idea

 

[whitehot1]

I used a mechanical modulator that i bought from Transtar part # 40 M to make the th400 shift automatically.

Later on i bought a vacuum valve and an adjustable modulator to better fine tune the shift points and it worked well. I forget where i bought the vacuum valve setup it's been to long ago.

 

[Wahoo]

So i need to modify the pump of the th400 to prevent thrust bearing failure. Anyone familiar with this?

I found this info but its not a how to.

http://www.jalopyjournal.com/forum/threads/turbo-400-causing-engine-front-bearing-failure.662548/