TH400 Teardown & Complete Rebuild-FREE

We take apart TH400 from start to finish & do complete rebuild-FREE!

[@TUBEORATER]

I did my 33' rv th400 two years ago . Had previous experience with my '65 NoveSS 283 powerglide conversion to 350hp 350 + th400 hd.. Had driveline cut too long and smashed the output bearing. Learned my lesson after 3 rebuilds with B&M parts. Transmission was too strong for the rear 3.08 and split the carrier In two. Replaced with a stronger '66 carrier. Decided to "tow truck Allison" my HD rv 400. Put all the best parts in and went for the Honda ,005 clutch clearance. PERFECT!!!😮 Shifts like a dream Also added temperature and pressure gage on dash. Sweeet.

[@glennsullivan9322]

Thank you very much, this video is super helpful

[@V8Lounge]

This is a great tutorial for the TH400. I found an inner lip seal and an inner beveled seal (without a thin lip) in my rebuild kit. They have the identic size for the inner size of the intermediate piston and the direct drum piston. Does anybody knows where to use the lip seal and where to use the beveled seal.

[@BrianSwayne]

All the 400 seals for pistons have a lip.

[@V8Lounge]

@@BrianSwayne yes you are completely right. After I've read your answer I checked the kit again and there are 3 inner lip seals with the same diameter in it. One with the lip pointing inwards to the middle and two with the same diameter that have the lip to the outside. The one with the inner lip is for the intermediate piston and the two with the lip to the outside I suspect that they are for the direct and forward drum. I was confused because I didn't realise that the intermediate seals against the inside. Thank You from germany.

[@yungswag1761]

This has been one of the most informative videos I've ever watched, some really cool well-kept secret tricks, I have two questions do you check your clearances before soaking the clutches or after and I found it odd that you didn't use the studs to line up the valve body is there a reason for this?? I thought it would be a good idea ??Thank you DAN LAPLANT Rochester New York

[@BrianSwayne]

Yes check clutches dry. I have been doing this for a long time. These vids are over 20 years old.

[@jonathanhause7466]

Thank you for the video. Bell housing was cracked on the truck I just bought and have no other alternative to doing it myself or staring at my broken down truck because I cannot afford a new trans. One question so far. Wheee can I rent the spring compressor you are using at around 18 min into the video? I’ve asked everyone I know and called auto parts stores, taken the part into the stores even and they have no clue. I eventually used a couple c clamps to take one off and the springs went everywhere. 2 still missing!

[@geoffgreer9393]

Where are you located? I heard Ottawa on the radio

[@cordialcortex3841]

When th' hits t' fan,,, bottom feeders survive! Proud!

[@gottagoat]

Its not funny but Im laughing my ass off, sorry dude

[@7paperboy]

Great video, you never mentioned a case saver ring or a four tang washer for the case before the tail shaft assembly is installed. Is there a reason for leaving those out?

[@BrianSwayne]

Probably just forgot. Was made over 20 years ago.

[@cordialcortex3841]

Man! You're a Rock Star wi'this shit

[@CaptainCurt07]

Great video, I really appreciate it👍🏼 Sir my th400 is stuck in park, I got a corvette with 671 blower and I usually turn it off in drive when I pull in garage after a drive up my street, I’ve not drove or started in months and as stated it’s stuck in park, my shifter cable moves, linkage moves as should! I took my pan down to inspect and nothing looks disconnected, I manually moved gear selector and “ from my eyes” I don’t see anything? Can you please help with a process of elimination as to what to look for, I sure appreciate that as I’m in dire need of move car ( getting it out of park) as I’m selling my house and I will be rebuilding my th400 after I move ( thanks to your videos) ANY HELP GRATEFULLY APPRECIATED 👍🏼👍🏼

[@w8e0s6t]

Cool video really helpful in everything..I have a th400 that don't shift normal driving or when I try to shift manually .only at high rpms also only got it to shift in 2nd and let off not sure if it even shifts into 3rd at high rpms I've checked govenor and looks in good shape shaft moves and plastic gear is good and put new vacuum modulator still acts up any idea as to what it could be ..any help would be appreciated..

[@BrianSwayne]

Pull out the governor and have a look at the valve sticking

[@ED-fn7iz]

Where did you get the drum spring compressor. I like the one he used cant find it anywhere?????

[@BrianSwayne]

I bought it from a Chrysler dealership.

[@craigbass2060]

This is a very knowledgeable video but there a couple things he forgets to show the case c clips ther 1 thin 1 large beveld and 1 large non beveld also the shaft holes must line up dont pur opposite this will cause problems

[@allotoi7777777]

When you say soak the disc for 30 minutes, is it in transmission fluid ?

[@BrianSwayne]

Yes

[@musclebone7875]

I'm gonna plug my th400 case connector because i installed a gear vendors overdrive. What should I do with the kickdown solenoid wire inside the transmission? Thanks

[@BrianSwayne]

No need to do anything if your not using it.

[@musclebone7875]

@@BrianSwayne thanks. I'll just leave it inside the transmission unconnected.

[@inscoredbz]

He stated removing the 3rd accumulator spring in the valve body deletes the band, he left the band out, but then he installed the intermediate servo to use with the band. I'm confused. Does leaving the spring out of the 3rd accumulator in the valve body eliminate intermediate band apply?

[@BrianSwayne]

Plugged apply but left piston in. Yes no band required unless you want engine braking.

[@inscoredbz]

@@BrianSwayne so for engine braking all that would need to be done is adding the band with all the same mods?

[@BrianSwayne]

@@inscoredbz Yes and dont plug apply hole.

[@inscoredbz]

@@BrianSwayne so the accumulator pressing on the servo is what applies the intermediate band?

[@BrianSwayne]

@@inscoredbz yes

[@joelgonzalez7713]

Do you need the up facing seal on the forward and direct drum

[@BrianSwayne]

If you dual feed leave drum seal out of high but leave it in forward. If u remove in forward it just engages harder into gear.

[@joelgonzalez7713]

@@BrianSwayne darn it's done I left them both out with no cave washers I'll see how it does tomorrow it's for my old service truck

[@wryanddry2266]

Sad that the video is blurry. Hard to watch it.

[@BrianSwayne]

It was made 20 years ago.

[@VitiatedsHOWTO]

Pretty clear to me

[@kwsmith2431]

Couldn't continue watching with you using a 1/2 impact

[@funfun8095]

HORRIBLE CAMERA!

[@rlovell383]

You planning to make a video as detailed with a better camera?