G3GM
Would you like to react to this message? Create an account in a few clicks or log in to continue.

G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


TH350 to TH400

5 posters

G3GM :: G3 Tech :: Engine & Driveline

Go down

TH350 to TH400 Empty TH350 to TH400

Post by bluemonte87 Sun Nov 08, 2009 12:44 am

What does this swap entail?

It's my 74 El Camino, and the donar trans is coming out of an 83 Chevy van (with really low miles). My trans has been beat and it's just tired, so I'd want to swap in this TH400. What does this operation entail and have any of you guys done this before?
bluemonte87
bluemonte87
G3GM Member
G3GM Member

Street Cred : 1

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by bigredlaguna Sun Nov 08, 2009 12:49 am

Electric switch at the gas pedal, move the crossmember back, and the yoke for the driveshaft. That's all I can think of right now.
bigredlaguna
bigredlaguna
G3GM Senior Member
G3GM Senior Member

Street Cred : 53

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by bluemonte87 Sun Nov 08, 2009 12:57 am

So it's a weekend job? If I move the crossmember back, will that require welding?
bluemonte87
bluemonte87
G3GM Member
G3GM Member

Street Cred : 1

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by bigredlaguna Sun Nov 08, 2009 1:54 am

It isn't that much of a difference. Maybe drilling a couple of new holes in the frame rail. You might not even have to do that since some of these cars came with TH400's anyway.
bigredlaguna
bigredlaguna
G3GM Senior Member
G3GM Senior Member

Street Cred : 53

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by bigredlaguna Sun Nov 08, 2009 2:27 am

Here is a description of a swap in a 70 chevelle. The process is almost identical to this generation

http://www.chevelles.com/forums/showthread.php?p=2406285
bigredlaguna
bigredlaguna
G3GM Senior Member
G3GM Senior Member

Street Cred : 53

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by BlackChevelleSS Sun Nov 08, 2009 11:19 am

The switch at the gas pedel isnt required. all it does is downshift when needed and change the shift points when WOT.

Since the tranny is out of a van, make sure its not a long tail, if it is then you might want to look for another. the driveshaft will only be a few feet long and might stress the joints and the frame will have to be drilled for it.

Using a short tail should go right in using a 1" shorter drive shaft with th400 yoke.
Youll need to use the th400 dipstick as well.

___________________________________________
www.cardomain.com/id/3115ultima

TH350 to TH400 SIG2
BlackChevelleSS
BlackChevelleSS
Management
Management

Street Cred : 20

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by The Dude Sat Nov 14, 2009 6:30 pm

Hey Black while we're on the subject, what's my 73 set up for? I know that sounds bad, but I still haven't had time to mess with it much.
The Dude
The Dude
Management
Management

Street Cred : 48

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by BlackChevelleSS Sat Nov 14, 2009 6:38 pm

Its not, the driveshaft is for a th350.... but other than that you can put anything in it.

___________________________________________
www.cardomain.com/id/3115ultima

TH350 to TH400 SIG2
BlackChevelleSS
BlackChevelleSS
Management
Management

Street Cred : 20

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by The Dude Sat Nov 14, 2009 7:10 pm

Yeah, my main concern was the driveshaft. I thought you had said something about it having a TH400 at one point, didn't know what all is hooked up to the TH350 in it now.
The Dude
The Dude
Management
Management

Street Cred : 48

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by BlackChevelleSS Sat Nov 14, 2009 7:20 pm

The th400 driveshaft that was in it was from the SS

___________________________________________
www.cardomain.com/id/3115ultima

TH350 to TH400 SIG2
BlackChevelleSS
BlackChevelleSS
Management
Management

Street Cred : 20

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by The Dude Sat Nov 14, 2009 8:02 pm

Duhhh, I guess I forgot about that one. Brain fart.
The Dude
The Dude
Management
Management

Street Cred : 48

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by novaderrik Sat Dec 12, 2009 6:01 pm

BlackChevelleSS wrote:The switch at the gas pedel isnt required. all it does is downshift when needed and change the shift points when WOT.

Since the tranny is out of a van, make sure its not a long tail, if it is then you might want to look for another. the driveshaft will only be a few feet long and might stress the joints and the frame will have to be drilled for it.

Using a short tail should go right in using a 1" shorter drive shaft with th400 yoke.
Youll need to use the th400 dipstick as well.

even if it is a long tailshaft trans, it still mounts up the same as a short shaft TH400- just slide the crossmember back and shorten the driveshaft as needed and put on the TH400 yoke. the length of the driveshaft won't affect the operation- there are many cars out there with much shorter driveshafts that what will be required for even a long shaft TH400. as long as the angles are good, then it won't be a problem.

novaderrik
G3GM Member
G3GM Member

Street Cred : 7

Back to top Go down

TH350 to TH400 Empty Re: TH350 to TH400

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

G3GM :: G3 Tech :: Engine & Driveline

 
Permissions in this forum:
You cannot reply to topics in this forum