TH400: Aftermarket Forward Drum Assembly

[@paulo7344]

Thanks Shawn, I always get something out of your vids. Great content as usual. Again Thanks from Canada.

[@mountainsgarage]

Thanks my Northern Friend!

[@skywaves5175]

Your video came in just in time. We started assembling our th475 and we are at a stand still due to I had ordered the th400 kit and it came with 5 clutches and not 6 on the one drum. Waiting on parts. I always enjoy your videos. Thanks and many thanks for putting out these videos that helps us DIY.

[@mountainsgarage]

Glad to help! Thanks!

[@stuartbuckley8720]

You have a calming voice, confident sounding which helps learning from you. Thanks for sharing the information, you are a great teacher.

[@mountainsgarage]

Thank you! Glad to help!

[@KarKamp]

Another great and informative video greatly appreciated as always and its good to get the info your needing on a specific area that most everyone else just skips past..

[@mountainsgarage]

Thanks!

[@BigFun4Life]

Thanks for another informational th400 video..I like free information..lol

[@mountainsgarage]

Thanks Buddy!

[@jonathanmoore5112]

Do you leave the seal out of the forward drum? I’m not talking about the lip seals on the piston. I’m just curious if there is a benefit to that?

[@gbgn1]

You need to try the new Sonnax chrome molly drum and shaft. Real nice stuff

[@mountainsgarage]

I will check it out, thanks!

[@jeepgodfabrication9970]

Nice video. With the rising prices of parts, I’m thinking about just buying 4l80 core transmissions. Usually for a hundred bucks a core it sounds like I could use the drum and sprag, the forward hub, and at least the thinner intermediate clutch pressure plate. Oh, do you have any use for a th375 output shaft and tail housing before I toss it?

[@mountainsgarage]

Yes, it pains me to part out a transmission, but I am sure I will use the parts. I have a few with broken cases.
I appreciate the offer but in a rare moment I will have to pass. Thanks you for the offer!

[@tacotimeracing6638]

So maybe someone here has some "input" LOL .... I have a billet input shaft and drum that doesn't have a check ball in it, and I am assuming that it will need a piston with a check ball?? I am wondering if that is the reason the clutches and steels were looking ruff from only a few passes in the race car.... I didn't build the transmission, but I am in the process of rebuilding it and a backup for Sick Week coming up in Feb so any help is welcome! Thanks!

[@vrg69]

On the forward hub do you leave any seals out

[@mountainsgarage]

Yes I leave out the seal on the drum. No other mods needed.

[@mrrobot545]

What about the part number for the Steels?

[@DanielsDesign]

Have you ever had trouble with the splines of the fti forward hub? I ordered two this past week from summit and both were either not machined correctly or I’m missing something. Just curious if you have ever had trouble? I ended up getting a tci forward hub. Thanks

[@mountainsgarage]

I want to go check it now! I will report back!

[@DanielsDesign]

@@mountainsgarage I ended up finding out that the shaft I had must have been really old. I’ve been told pre early 70’s have a slightly larger shaft than the newer ones. I got another shaft and the billet hub fit perfectly? Does any of this sound familiar?

[@mountainsgarage]

@@DanielsDesign Yes I just built a transmission yesterday with the larger main shaft, a 4L80E hub would not fit.

[@shawns57garage]

what is the best fluid to run in the older (70's) TH400 ?? I see so much conflicting info on the google machine

[@mountainsgarage]

Dextron III does it for me.

[@shawns57garage]

@@mountainsgarage thank you sir ! For whatever reason it seems hard to find … my local NAPA and others I’ve checked have low or no stock 🤔🤷‍♂️

[@mountainsgarage]

@@shawns57garage The Walmart stuff is fine even.

[@mrrobot545]

Check ball or no Check ball piston?

[@mrrobot545]

at 12:42 it got answered lol

[@mrrobot545]

Anyone know the number to that lip seal tool. I tried looking but im coming up short

[@mountainsgarage]

The ATSG TH400/3L80 manual is a free PDF online, all the tools are on page 147. J21362, J21363, J21409

[@mrrobot545]

@@mountainsgarage thank you Shawn. Can’t wait to me you. My home track is NE Dragway as well.

[@mountainsgarage]

@@mrrobot545 Awesome! I will look forward to it!

[@funfun8095]

👍

[@funfun8095]

Can you provide the install tools part numbers?

[@mountainsgarage]

I will get them in the morning.

[@stuartbuckley8720]

@@mountainsgarage I am also interested in the tool part numbers, thanks for the information in advance.

[@mountainsgarage]

The inner protector for the forward/direct is J21362, the outer is J21409

[@stuartbuckley8720]

@@mountainsgarage thank you! You are awesome.

[@adrenalinejunkie126]

Lube!!!! 😂😂😂

[@Daniel-Johnson]

LUBE lol