th400 gbody crossmember

[daturbosix]

who makes one? its for a pre-'84 without the frame extentions

-Jeff

 

[forcefed3.8's]

A TH400 was never put in any g-body. The 2004r crossmember will work, you probably know all of this. You can either buy a dual exhaust crossmember from Summit, etc, or use a 2004r crossmember and buy the mount extension. Summit sells those as well. I am sure there are other sources though.

 

[daturbosix]

A TH400 was never put in any g-body. The 2004r crossmember will work, you probably know all of this. You can either buy a dual exhaust crossmember from Summit, etc, or use a 2004r crossmember and buy the mount extension. Summit sells those as well. I am sure there are other sources though.

wait, i can just buy a mount extension and then use a stock 200-4r xmember?

 

[forcefed3.8's]

Yes, the mount length is about the same, barley different. I think there might be a slight height difference when using the stock mount. HR sells a conversion mount. What it does, I am not sure. I am using a stock crossmember that was modified to use a center mount. The TH350, 200, 250 have a mount that is further foward.

 

[SSedan64]

Swap Info here>> Transmission Swap Tech many have used the Jeg's C-member lately, say it's cheaper, may be onsale.
Iceman has a nice light weight C-member & Extension also>> Iceman Products

 

[daturbosix]

i called jegs, they dont make one for a 400

 

[Scott Atk]

Here's the easiest way:
HRpartsNstuff "Your WWW performance parts supplier"
And here's the nicest way:
http://www.tntraceshop.com/g-body_crossmembers.html

 

[supercrackerbox]

If weight is a concern, that Iceman one is a very nice piece and reasonably priced.

 

[toofastforyou]

Swap Info here>> Transmission Swap Tech many have used the Jeg's C-member lately, say it's cheaper, may be onsale.
Iceman has a nice light weight C-member & Extension also>> Iceman Products

Speaking of crossmembers, do you know if the same crossmember will work if switching from a 200-4R to a 4L80E transmission?...or will there be some slight modifications to do?

Claude.

 

[SSedan64]

Claude, Looks like the 4L80E mount is 3-7/16" farther back compared to the 2004R mount location>> Automatic Transmission Identification so some Mods would be needed.
Iceman/Rick could make one for a 4L80E, could just add a longer mount pad on a 2004R C-member or weld the mount pad on opposite side of center bar if it wont interfere with Trans case/tail.

LW Crossmember Pic>> Iceman Products (1 of 11)

 

[SSedan64]

i called jegs, they dont make one for a 400

The 400 & 2004R mount locations are the same.

 

[daturbosix]

so i gotta buy one.. who has one thats is resonably priced?

that g-force one is almost $300!

 

[buickboy]

$99 from HR Parts and Stuff for a TH400 specific mount, or if you already have the HR 2004R mount, then just drill a new hole in the plate and bolt her up. I did the latter.

Mitch

 

[87buickracer]

Here's the easiest way:
HRpartsNstuff "Your WWW performance parts supplier"
And here's the nicest way:
http://www.tntraceshop.com/g-body_crossmembers.html

x2 that's what I got...