th400 rebuild

General topics not pertaining to one particular type of engine, or topics regarding non-Cadillac engines.

Re: th400 rebuild

Postby PJ McCoy » Thu Apr 06, 2017 5:34 pm

Outlaw wrote:WHEN i did mine i stacked 2 wheels an tires on each other worked great, right height,
only problem was couldn't get the two drums to go back together,
other than that WAs easy


:thumbup: :thumbup:
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Re: th400 rebuild

Postby PJ McCoy » Fri Apr 07, 2017 7:23 am

Here are some pics
making good progress.
[img]
transmission%20barrel.jpg
[/img]
Attachments
transmission barrel.jpg
just needs head lights and wheels. Maybe bumpers and a saddle.
trans2.jpg
stuck in barrel. See why the plywood is needed.LOL
trans5.jpg
transmission 4.jpg
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th400 rebuild

Postby Bruce Roe » Fri Apr 07, 2017 10:10 am

Here is my method, just put 3/8" threaded rods into 4 bolt holes. Movable, the attached
drip pan is good, and I can access anything such as a little compressed air to help
settle clutches and test. Bruce Roe
Attachments
TH400Std.png
TH400Std.png (72.97 KiB) Viewed 188 times
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Re: th400 rebuild

Postby PJ McCoy » Fri Apr 07, 2017 12:09 pm

Bruce your amazing! what a wonderful idea. The only draw back is you miss out on all the FUN!! As in trying to remove a stuck transmission from a plastic barrel.
laying it down and kicking the $#It out of it. watching it thump and roll down the drive. Oh how much fun you are missing with your portable ans convenient space saving stand. :relieved: :relieved:
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Re: th400 rebuild

Postby PJ McCoy » Tue Apr 18, 2017 1:11 pm

[img]
20170409_130017.jpg
20170409_130017.jpg
[/img]
Attachments
20170409_130017.jpg
20170409_130017.jpg (32.53 KiB) Viewed 121 times
20170408_114054.jpg
notice the chip on the corner
20170408_114054.jpg (27.57 KiB) Viewed 121 times
20170408_114133.jpg
clutches and steels look great and measure out perfect,
20170408_114133.jpg (34.79 KiB) Viewed 121 times
20170408_103546.jpg
can see the ink still on the clutch,
20170408_103546.jpg (25 KiB) Viewed 121 times
20170408_103538.jpg
I was told it needed a rebuild, The front pump did not measure good, everything else did. hummm, im scratching my head on why it didnt shift for him
20170408_103538.jpg (31.6 KiB) Viewed 121 times
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Re: th400 rebuild

Postby PJ McCoy » Tue Apr 18, 2017 1:17 pm

more pics,
Attachments
20170408_095606.jpg
20170408_095606.jpg (30.12 KiB) Viewed 121 times
20170408_102656.jpg
this looks as good as the one in my kit,
20170408_102656.jpg (29.02 KiB) Viewed 121 times
20170408_103407.jpg
20170408_103407.jpg (29.06 KiB) Viewed 121 times
20170408_103230.jpg
the bushings look new, all of them.
20170408_103230.jpg (33.67 KiB) Viewed 121 times
20170408_103252.jpg
everything looks new, even the piston seals fit better than my kit. Again. What could cause this trans not to shift.
20170408_103252.jpg (20.37 KiB) Viewed 121 times
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Re: th400 rebuild

Postby PJ McCoy » Tue Apr 18, 2017 1:39 pm

IM STUCK
Can you guess were? Those who have done this before already know. Everything was going great until I reach the forward drum or the last what ever its called. I had lined up all the clutches and steels. slowly lower the forward drum(thats what im calling it anyways) then shake,bounce,bam drops down one maybe two? How the heck am i to know. Repeat and repeat, until your pissed off and walk away. Your dominating arm will slowly start to lift upwards after all this struggle.
I dont drink(YET) or smoke(yet)(thinking C.A. or CO.) :relieved: but this part is a royal pain. To me the hardest part of the build. Ok now im there (i think) slide the front pump on and something doesnt feel right.
Pull it all back apart, 3x i did this, Finally got there. Bolts can thread down. pump looks very close.
NO GO!! bolts are hand tight and the shaft dont turn. nothing turns, the out put shaft dont turn. the only thing turning is my face! And that is turning red :gnasher:
I dont have the make shift tool i need to make this work.

How can i know for sure the drum is all the way down?
I need help.
PJ
ps, i have not touched it for 4 days. On vacation now so i can spend some quality time on this trans.
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Re: th400 rebuild

Postby PJ McCoy » Tue Apr 18, 2017 1:59 pm

I have a few more questions.
what could keep the trans from shifting? This is what i was told.
Im thinking its in the valve body, if so what could i look for in there.
Remember, it only had two check balls. Im thinking i should put all 5 back in.
I dont know what im looking at in the valve body to see if its been modified or not.
Nor do i know what the stock item should like.
Thanks to all who are willing to help.
Oh, the check balls if i remember correctly were in the #1 and #5 valve body. In my book i saw 3 checkballs in line kinda. The one in the middle. I dont have the book in front of me but i think it was 1,3,5, were inline. 2,4,6 were elsewhere.
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Re: th400 rebuild

Postby Outlaw » Tue Apr 18, 2017 2:33 pm

That's the problem I had, wish I could remember how you could tell when its in all the way, only way I got it to go all the way is just keep jerking it around,, took a couple days
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Re: th400 rebuild

Postby PJ McCoy » Tue Apr 18, 2017 2:58 pm

Outlaw wrote:That's the problem I had, wish I could remember how you could tell when its in all the way, only way I got it to go all the way is just keep jerking it around,, took a couple days


Im sure i can jerk it for a couple days, just hope it dont take that long. Im ready for a ride.
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TH400 rebuild

Postby Bruce Roe » Tue Apr 18, 2017 3:54 pm

This picture on my PHOTOBUCKET and some on either side show
how I measure to be SURE the direct clutch is seated (3 and 5/8"), then
measure to be SURE the forward clutch is seated (1 and 5/16"), before
making any attempt to install the pump. And some ways to help them
drop into place.

Looks like PHOTOBUCKET totally messed up my text, need to go clean
all that up. Bruce Roe


http://s93.photobucket.com/user/bcroe/m ... ort=3&o=12
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Re: TH400 rebuild

Postby PJ McCoy » Tue Apr 18, 2017 5:40 pm

Bruce Roe wrote:This picture on my PHOTOBUCKET and some on either side show
how I measure to be SURE the direct clutch is seated (3 and 5/8"), then
measure to be SURE the forward clutch is seated (1 and 5/16"), before
making any attempt to install the pump. And some ways to help them
drop into place.

Looks like PHOTOBUCKET totally messed up my text, need to go clean
all that up. Bruce Roe


http://s93.photobucket.com/user/bcroe/m ... ort=3&o=12


Thanks Bruce, Going to take it back down in the morning. Thats good info right there.
:beer2: :beer2: :beer2: :beer2: :beer2: :beer2: 6pack lol
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Re: th400 rebuild

Postby Darius » Tue Apr 18, 2017 7:07 pm

Outlaw wrote:That's the problem I had, wish I could remember how you could tell when its in all the way, only way I got it to go all the way is just keep jerking it around,, took a couple days


You are tempting me! I'm trying to stay "family friendly" but those words are rich in ways to go. :tapedshut:

Best,

d
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Re: th400 rebuild

Postby Darius » Tue Apr 18, 2017 7:09 pm

PJ McCoy wrote:
Outlaw wrote:That's the problem I had, wish I could remember how you could tell when its in all the way, only way I got it to go all the way is just keep jerking it around,, took a couple days


Im sure i can jerk it for a couple days, just hope it dont take that long. Im ready for a ride.
PJ


DUDE!! You aren't helping matters. A couple of DAYS?? Dang, you got stamina.

Bro.

d
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Re: th400 rebuild

Postby Bruce Roe » Tue Apr 18, 2017 7:12 pm

I showed how I get down to less than hours. Bruce Roe
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Re: th400 rebuild

Postby PJ McCoy » Wed Apr 19, 2017 8:23 am

Bruce Roe wrote:I showed how I get down to less than hours. Bruce Roe


YOU BOYS!!!!! I carefully and mischievous choosen the words to do 2 things,
1. Ansewer to the responce above
2. Give room for plenty of comedy.

Ya'll are cracken me up.
Darin i know your struggling right now, holding back provocative comments :devil: , I can only imagine whats going on in the wonderful mind of yours :scratchchin:
:jack:

Let'EM rip Boys!!!!! :owned:
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Re: th400 rebuild

Postby PJ McCoy » Wed Apr 19, 2017 11:50 am

PJ McCoy wrote:
Outlaw wrote:That's the problem I had, wish I could remember how you could tell when its in all the way, only way I got it to go all the way is just keep jerking it around,, took a couple days


Im sure i can jerk it for a couple days, just hope it dont take that long. Im ready for a ride.
PJ


I would like to retract my statement at this time. Its been 3-1/2 hrs and my forearms are done :eyebrow:
Im using Bruces measurements cause i dont have any. Im 3/32 off from his.
Im 3/32 longer(higher than i should be) acording to my depth gauge(digital caliper). Not sure if thats accurate as ive guessed a little(on the heavy side). both have a taperd edge so i had eye ball it. I dont think it has anymore to give. I turned,shook,rattled,and pumped air into the bolt hole to bounce the clutches. That dropped it about 1/4" and thats were im at now.

Any thoughts? Anybody?
Thanks PJ
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Re: th400 rebuild

Postby PJ McCoy » Wed Apr 19, 2017 2:49 pm

Isn't it amazing that when you walk away for an hour or two then come back to the project, everything just falls into place.
Yahoo!! Got the hard part done. Everything on the inside is done. pump is on, the new thrust washer for the front pump measured out at .975" there is some give to the shaft but i havent measured it yet. Finally, Now i need to sorce out 3 more check balls for the trans. The ones i got from a mom and pops are bigger than whats in the trans. Im going back with all 6. Hopefully i can find them in the morning. Im itching for this to be my T/A. :D :D
Thanks Bruce for the PM's and pics. They are worth more than 1000 words.
PJ
edit:
Ill be grabbing them from my long shaft 400. I totally forgot about it. Its been hiding under the work bench to long.
Ill update as i go.
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Re: th400 rebuild

Postby PJ McCoy » Thu Apr 20, 2017 5:38 pm

Made some progress today. I pulled the checks from the long shaft trans. got everything close to done. I was putting on the valve body and trying to connect the shifter with the valve body was giving me a fit. The servo on the other side i had in upside down. didnt know this until i tightened it all up. The i notice i cracked the valve body. The shifter slipped out toward the rear and sat on the 7/16 bolt head. Split my valve body about 1/4 inch. :banghead: :banghead:

Questions.
Can i use the valve body off my 76? The reason im asking is mt 70's model has a electrical connection in the servo. The 76 has a port thats plugged.
Can i disasseble the 70 and put it in the 76 without problems?

Thanks
PJ
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TH400 rebuild

Postby Bruce Roe » Thu Apr 20, 2017 5:51 pm

Generally you can swap valve bodies along with the plate; the cases are all the
same. A 70 is probably calibrated for a more powerful engine than a 76; the
pressure reg and vacuum modulator will be the same. That switch is for
emissions control of ignition on a 70; they didn't use it in 76. Bruce Roe
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