Th400 case repair - Chevelle Tech
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post #1 of 19 (permalink) Old Jan 17th, 20, 7:14 PM Thread Starter
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Th400 case repair

Hey! don't know if i'm on the right section but but i'll take my chance. I bought a used th400 to rebuild it for my project and after about 2 hours of trying to remove one of the tailhousing bolt, the case broke. Now i fear the second one on the left does the same since it's as stuck as the other. Might be a bad idea but since i can't weld aluminium to repair it myself, i was wondering if bolting the tailhousing using only 5 bolts could be a solution. What do you think about it?
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post #2 of 19 (permalink) Old Jan 17th, 20, 9:17 PM
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Re: Th400 case repair

Just my opinion, if the other bolts come out ok and don't break you could install a longer bolt and put a nut on the bolt in that hole as long as the rest of the case has no other issues.. Since it has a gasket on the tailhousing and the broken part is on the top of the case it might work.. If not you could find a case on e-bay or Craigslist.. thanks, Gary

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post #3 of 19 (permalink) Old Jan 17th, 20, 10:17 PM
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Re: Th400 case repair

0>>>Hey! don't know if i'm on the right section but but i'll take my chance.

Gee, I wonder if the transmission section would be the right place?
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post #4 of 19 (permalink) Old Jan 17th, 20, 10:18 PM Thread Starter
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Re: Th400 case repair

Quote:
Originally Posted by TAG55 View Post
Just my opinion, if the other bolts come out ok and don't break you could install a longer bolt and put a nut on the bolt in that hole as long as the rest of the case has no other issues.. Since it has a gasket on the tailhousing and the broken part is on the top of the case it might work.. If not you could find a case on e-bay or Craigslist.. thanks, Gary
little update, got the other bolt out without breaking anything else. I just saw that there is still threads for about the same length as a nut left on the remaining material so i though maybe i could bolt it with that and jb weld the bit that came off to prevent it from breaking again.
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post #5 of 19 (permalink) Old Jan 17th, 20, 10:21 PM Thread Starter
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Re: Th400 case repair

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Originally Posted by Tom Mobley View Post
0>>>Hey! don't know if i'm on the right section but but i'll take my chance.

Gee, I wonder if the transmission section would be the right place?
Well it's not a transmission related problem and more of a machining issue. Guess i'm sorry about that.
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post #6 of 19 (permalink) Old Jan 17th, 20, 11:11 PM
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Re: Th400 case repair

Carry the case to a welding shop, they can repair that for you.

Your just jealous because you can't hear the voices!

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post #7 of 19 (permalink) Old Jan 18th, 20, 12:23 AM
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Re: Th400 case repair

HI
Use either
Devcon aluminium putty
Loktite aluminium putty
Both canbe drilled and tapped
Its best to helicoil a repaired thread in alloy [its stronger ]
No better fillers or epoxy 2 part glues if u still have a complete broken section to reattach .

Both brands work well
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post #8 of 19 (permalink) Old Jan 18th, 20, 9:08 AM Thread Starter
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Re: Th400 case repair

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Originally Posted by oldcutlass View Post
Carry the case to a welding shop, they can repair that for you.
I though about it but here the prices are so high it would be cheaper just to buy an empty case...
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post #9 of 19 (permalink) Old Jan 18th, 20, 10:24 AM
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Re: Th400 case repair

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Originally Posted by GabLeGrand View Post
I though about it but here the prices are so high it would be cheaper just to buy an empty case...
I don't know where here is, I'm lucky as I have a friend that welds.
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post #10 of 19 (permalink) Old Jan 18th, 20, 11:57 AM
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Re: Th400 case repair

If you have some threads in case left clean real good. Then consider a 3/8" threaded stud, use red locktite on the threads of case and stud. Just a thought, I did this on a intake water outlet threads were some what stripped. Worked well. Good luck.
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post #11 of 19 (permalink) Old Jan 18th, 20, 1:29 PM
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Re: Th400 case repair

I'm for welding it also.

I'm a big fan of studding castings, especially aluminum. It allows the fastener to fully bottom out into the casting thereby grabbing every available thread. My 400 has studs and nuts in this location.
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post #12 of 19 (permalink) Old Jan 19th, 20, 12:39 PM Thread Starter
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Re: Th400 case repair

Quote:
Originally Posted by oldcutlass View Post
I don't know where here is, I'm lucky as I have a friend that welds.
I'm in Qc, Canada. I've been through a similar problem with another trans last year so i looked around and the cheapest i found was 150$ for welding a plug that i gave to him. I'll definitely invest in a gas bottle for my welder so i can weld aluminium soon.
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post #13 of 19 (permalink) Old Jan 19th, 20, 12:40 PM Thread Starter
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Re: Th400 case repair

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Originally Posted by paul bell View Post
I'm for welding it also.

I'm a big fan of studding castings, especially aluminum. It allows the fastener to fully bottom out into the casting thereby grabbing every available thread. My 400 has studs and nuts in this location.
I'm also a big fan of studding every single parts that can be studded. Will do so!
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post #14 of 19 (permalink) Old Jan 21st, 20, 1:30 PM
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Re: Th400 case repair

Quote:
Originally Posted by Tom Mobley View Post
0>>>Hey! don't know if i'm on the right section but but i'll take my chance.

Gee, I wonder if the transmission section would be the right place?
Why is this guy always an ass - always?

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post #15 of 19 (permalink) Old Jan 21st, 20, 1:37 PM
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Re: Th400 case repair

Tom is not an ass ALWAYS, only sort of short and curt, at times. I have no idea what his ass looks like. He did help Gabe, yes?

Anyway, my point to Gabe was that inert gas for a MIG wont really do aluminum, unless you have a combo or TIG machine. TIG does alloys best. Good luck!
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