Race TH400: Assembly

Lets start putting it together!

[@adrenalinejunkie126]

Gotta have potato salad and sweet tea! We like it Texas sweet here 🤪😎

[@MrLangleylad]

Thanks Shawn , great video . You truly are a TH400 parts junkie ! lol

[@vrg69]

Really been watching your videos on building a th400 trying to get the nerve up to build one

[@ovwok]

new subscriber thank you for the content.

[@funfun8095]

Really like these build videos. Would like to see one on a 2 speed th400. ;)

[@mountainsgarage]

I just might! Thanky!

[@cfmechanic]

This video almost gives me the confidence to rip apart and rebuild a trans. Great job

[@mountainsgarage]

cf mechanic Just do it, nothing but nuts and bolts!

[@CarportGarageDragRacing]

Do you have a more detailed video on drilling the overflow?

[@CarportGarageDragRacing]

Thanks for sharing these videos. I am attempting to rebuild my first TH400 with the help of your videos. Question though, so I should be able to slide a .007 feeler gauge down in the rear case bearing area with the output shaft pushed fully forward correct? I have the roller bearing with the bushing that has the lip on it the bearing fits around.

[@mountainsgarage]

That or use a dial indicator.

[@mountainsgarage]

And Thanks for watching!

[@tomholverson7715]

can you tell me where to get the spiroloxc from and the part number the big one and small one

[@ronbz455]

I have been fighting 1-2 shifts in my 70 Buick GS running high 10's for years. I have had to replace the case after breaking the bell off and I'm thinking that's when it got worse but broke 3 sprags I think. Running an unknown Reverse Manual Valve body and a 2.75 low gear for 20 or more years and trying to do it right this time. How can I directly email you or face book and then I don't have to check me email all the time.

[@snickerdoodleduke]

Great video! Can you run the Case Saver with a automatic valve body?

[@mountainsgarage]

I am sure someone makes a valve body that is automatic but deletes the front band. Maybe Jakes Performance or ATD. The case saver goes where the band was. Thanks for watching

[@mountainsgarage]

I just saw that Sonnex now makes a case saver that retains the front band, so any valve body will work.

[@noahthompson1811]

Do you stake your rear bushing to the case if so what do you use?

[@mountainsgarage]

I have the J tool to stake it, but cylindrical part bonding locktite is my choice.

[@carlosv.118]

Did you ever upload the second part of this video

[@mountainsgarage]

Yes 8 videos on this transmission assembly.

[@nickolausvassallo744]

Hey Shawn where are you located would like to have u set up my 400 turbo

[@mountainsgarage]

Maine, You?

[@antoniodiazquintero9238]

i have a th400 in a 6.2 diesel k5. I have a lot of engine roms and I get little power. What could be failing?

[@mountainsgarage]

Is it shifting? The 6.2 has a vacuum pump that feeds the vacuum modulator so it will shift. Check to see if it’s making vacuum?

[@antoniodiazquintero9238]

@@mountainsgarage If it changes its 3 speeds and R perfectly, everything is fine. The only thing that needs a lot of rpm to move from Stop, much more rpm than normal. I have tried another similar car and it moves with little acceleration, mine needs a lot of rpm to move.

[@vrg69]

Do you have any suggestions for manuals on building a th400

[@mountainsgarage]

I have the ASTG manual, the blue one you can find on Amazon or Ebay. There are a couple books that have nice color pictures out there also.

[@vrg69]

@@mountainsgarage thanks for your help and keep up the videos can't wait to see the 6.0 fire up

[@mountainsgarage]

@@vrg69 Anytime!

[@erniehenshaw4161]

Do you ever install case savers in these?

[@mountainsgarage]

Yes I like the aluminum version that bolts through the case and front band hole by FTI or Transmission Specialties that sells around $50. There are also smaller metal versions.

[@mountainsgarage]

I actually install one at 17:22 in this video.

[@erniehenshaw4161]

@@mountainsgarage Thanks.

[@jesusm2797]

I bought a used th400 with trans-brake, it leaking from vent tube as soon as I start the car, any idea what can be causing this? Thanks

[@mountainsgarage]

Pressure is entering the vent passage in the pump or at the pump gasket. That would be my guess.

[@jesusm2797]

@@mountainsgarage I don't do transmissions, but I might give the gasket a shot, thank you

[@mountainsgarage]

@@jesusm2797 Nothing to lose! Need help just ask!

[@jesusm2797]

@@mountainsgarage thanks

[@jesusm2797]

@@mountainsgarage the 1/8 npt plug above towards the back of the shifter lever is missing, I will put a plug in its place, but what is that for?

[@BigFun4Life]

Shawn can I get your email,thanks Kip…

[@mountainsgarage]

[e-mail]