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2004r transmission crossmember

PostPosted: Sun Aug 27, 2023 9:00 pm
by al89
Hi, I have a 2004r trans to go into a 77 Sunbird. Does anyone have or know where I can get a cross member? It maybe that I need to fabricate one. Thanks in advance!

Re: 2004r transmission crossmember (no LS)

PostPosted: Wed Aug 30, 2023 10:48 am
by al89
I am still looking into how this is done. From what I understand I need to shorten the torque arm and mount it to the cross member. This sound like the hard part of this swap. I wish I could find someone who has already done this.

This car was suppose to be a birthday present for my wife, but I am a long way from being finished. It seem like there are a lot of parts that I have yet to find. I did buy a second car that had a 196 Buick V6 in it, but many of the parts are not there.

Also, I maybe willing to swap someone a 4.8 liter LS for the missing parts. I have no use for that engine, I am sure someone else would love to have it.

Re: 2004r transmission crossmember

PostPosted: Wed Aug 30, 2023 8:21 pm
by monzaaddict

Re: 2004r transmission crossmember

PostPosted: Mon Jan 15, 2024 1:19 pm
by Monza Harry
https://h-body.org/ many of your questions can be answered here. There is an entire transmission swap section within those links. Transmission is same overall length and spline dia./and count. Transmission mount is moved back ~2" IIRC a torque mount will be required, there are a few approaches to this use, the stock X member and create a new floor piece. Offset the stock X member to existing floor/car mount start from new. And what your imagination can do. An intragral X-member torque arm mount or create one from the transmission. None of these are "Buy & Bolt in" this is a more grass roots hot rod kind of car [built not bought]. Harry

Re: 2004r transmission crossmember

PostPosted: Mon Aug 26, 2024 10:40 am
by RandyC
I made my own, I also had to shorten the torque arm 5 inches and weld a bracket for it to connect to the cross member. Seems like it will have the pivot point right in line with the u-joint, hopefully making things pivot easier.

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Re: 2004r transmission crossmember

PostPosted: Mon Aug 26, 2024 11:14 am
by RandyC
Also, an easy way to do a lockup converter, I used one off a 85 Chevette, they have a vacuum switch, and if you find one in the junk yard get the plug, very hard to find. Newer gm had a vacuum switch but Im not sure what years.and you need a 2 switch brake switch. One is normally closed for the lockup, one is normally open for the brake lights. Wire power into either then run to the other in, then out to the converter plug on the trans.

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