TH400 Race Build, 800-1,000 hp capable. Full Manual, Dual Feed, Highlights to basic mods.

This Pontiac bell housing TH400 is for racing and is full manual shift. I show the modifications needed and some of the machining necessary.

[@I_hate_tires]

Great video! I did these mods to my th400 a couple years ago and it’s still going strong. Wish I had seen this video first, it would have made my life a little easier lol

[@jahirhernandez8606]

Como armar una trasmisión Th 400 desde el principio

[@066montana]

Best way is to start with a th475. HD case. 6 clutch direct. Factory deep pan and STRAIGHT CUT GEARS = No thrust loads. Already can take the 34 element sprag with zero machining. Just rollerize the rear case(eliminate the 3 tang and 4 tang washers). Slap a transbrake in her, dual feed direct clutches and she will hold a 1000 hp without even trying

[@jeepin270]

Jaese066 I am starting with the th475 with HD case an straight cut gears. This is my 1st trans build. Could you email me I would like some of your advice if your willing. [e-mail]

[@TheAkstewie]

Mountains garage goes through that exact same thing. Makes it a beast with no effort just beat on her all day

[@inscoredbz]

So what if you don't want engine breaking in second gear? Just leave the band out? Anything else have to be done?

[@ronbonick4265]

I used to build trans years ago I hope I can remember how if I ever need to. subscribed

[@samuelrodriguez8198]

Hello friend, I saw your video and I would like to get a question right, I took my th400 transmission to be repaired but it did not make the third change, I already changed the governor, modular, converter, and it continues the same, now to your great experience what will be the problem for which Does the third change not make the transmission? please help

[@tc104x]

If you've done all that it sound like your fwd drum is not applying and could have a torn lip seal or overrun sprag not holding. It may be internal at that point. There are of course many variables like governor springs, governor itself, circuit valves for that gear and the above physical issues, even accumulator issue as well. Do what you can externally, then internally from the valve body or remove and inspect. You can aircheck with valve body off.

[@tilt213]

97 & up 80e drum are 34 element. Some are 6 clutch with a .640 work height

[@tc104x]

thanks, I think I said 32 instead of 34. Yes you are correct on the other as well :)

[@tilt213]

@@tc104x I appreciate you taking the time to show all of the machine work as well.

[@carlose.torresdeltoro8339]

R.C

[@keysautorepair6038]

Can't handle the clearing you throat noise.

[@kanakamaoli9642]

Cool video, Thanks

[@ryanr9348]

Wouldnt happen to know the measurement from the face of the bellhousing to behind the pump of a th400 transmission with stock bellhousing

[@ugd240000]

nice info

[@desmondgriffin3924]

Do you have to machine down the older like 1971 th400 drums for the 34 element sprag

[@tc104x]

I have as an experiment but havnt put it to use. I won't try it in a customers car. May be able to try one in the spring.

[@razzyjr12345]

I don't know if I miss understood can you use the 700r4 band in the turbo 400 is that what you were meaning at the end of this video?

[@tc104x]

Hi, no 700 band can not be used in the 400. I was referencing how i dont use Kevlar bands in stock application...i just happen to have a 4l60e band handy in reference.

[@haydukemaryboy305]

How much was the lathe ?

[@mrk7201]

Nice

[@jorgelozada5582]

hub billet,,waffer clutch 4,6,6 case saver thath its

[@mastertek383]

Alcohaulin ass

[@bigbelconut]

This is to painful to watch.