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Has anyone fabricated a T56 "Hump Style" crossmember?

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Old Apr 8, 2010 | 12:11 PM
  #1  
zacharyhorn's Avatar
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From: Greenville WI
Car: 91 Firebird
Engine: Turbo 355
Transmission: T-56
Axle/Gears: 3.73:1 7.625" 10 Bolt
Has anyone fabricated a T56 "Hump Style" crossmember?

If so, do you have any pics? I'd like to do this. I have the normal Skulte crossmember and my exhaust has literally 2" clearance at the y-pipe. Any help is appreciated.
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Old Apr 8, 2010 | 12:19 PM
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built91Z28's Avatar
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From: Orlando
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

I'm making mine this Saturday. I'll post pics of what I make
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Old Apr 8, 2010 | 01:11 PM
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85MikeTPI's Avatar
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From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

Since Andris officially closed up SPD, I don't feel too bad about posting these pics.. He used my car for the proto-type SPD double-hump T56 xmem..

I never formatted the pics, just raw as they came out of the camera:

http://www.eecis.udel.edu/~davis/z28/2006/060115SPD/

Afterwards, I built and welded up a bracket to it for my Spohn TQ arm:

http://www.eecis.udel.edu/~davis/z28...CP_%20001.html
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Old Apr 8, 2010 | 01:35 PM
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built91Z28's Avatar
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From: Orlando
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

Mike, do you know what size tubing he used for that? I was going to use flat plate strenghtened by square tubing welded to it but that looks stronger and easier in the end.
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Old Apr 8, 2010 | 01:46 PM
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85MikeTPI's Avatar
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From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

Originally Posted by built91Z28
Mike, do you know what size tubing he used for that? I was going to use flat plate strenghtened by square tubing welded to it but that looks stronger and easier in the end.
It's 1x3" box tubing. Mild steel. The end pieces that bolt to the sub-frames are 3x3 angle steel.
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Old Apr 8, 2010 | 02:11 PM
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zacharyhorn's Avatar
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From: Greenville WI
Car: 91 Firebird
Engine: Turbo 355
Transmission: T-56
Axle/Gears: 3.73:1 7.625" 10 Bolt
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

Originally Posted by 85MikeTPI
It's 1x3" box tubing. Mild steel. The end pieces that bolt to the sub-frames are 3x3 angle steel.
Wow. Very helpful Mike! My plan was to chop up my straight style skulte crossmember and salvage the mount piece as well as the two angle pieces that mount to the subframe. I would like to use anlge iron though. Not sure what your take on that would be?
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Old Apr 8, 2010 | 02:18 PM
  #7  
built91Z28's Avatar
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From: Orlando
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

I just called a few places near me and I'm not sure I'm going to be able to get boxed steel so mine my still be made out of angle iron, flat plate, and some small square tubing to brace everything. I may even make box tubing out of flat plate and square tubing. I planned on using 3/16" for the angled pieces and flat plate. The square tubing is thinner though.
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Old Apr 8, 2010 | 02:28 PM
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zacharyhorn's Avatar
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Joined: Oct 2005
Posts: 809
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From: Greenville WI
Car: 91 Firebird
Engine: Turbo 355
Transmission: T-56
Axle/Gears: 3.73:1 7.625" 10 Bolt
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

Originally Posted by built91Z28
I just called a few places near me and I'm not sure I'm going to be able to get boxed steel so mine my still be made out of angle iron, flat plate, and some small square tubing to brace everything. I may even make box tubing out of flat plate and square tubing. I planned on using 3/16" for the angled pieces and flat plate. The square tubing is thinner though.
Sounds like its going to work out. I don't really have access to tube steel either. I'm curious to see yours when yours is complete!

Also, Do you guys think I can just make one out of 3" x 1/4" flat stock?

Last edited by zacharyhorn; Apr 8, 2010 at 02:56 PM.
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Old Apr 9, 2010 | 07:06 PM
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From: Orange County,NY
Car: 1982 Z28
Engine: 355
Transmission: T56
Axle/Gears: 12 Bolt
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

I used 1/4" plate bent into a squared U around the trans mount... and 1/8" plate for the rest.

https://www.thirdgen.org/forums/fabr...6-gen-1-a.html
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Old Apr 17, 2010 | 08:29 PM
  #10  
built91Z28's Avatar
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Joined: Feb 2010
Posts: 1,446
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From: Orlando
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

Alright well it took a lot longer than expected but I said I would post pics when done so here they are. I'm only posting two pics but if you click the cardomain link in my sig and go to page 3, there are a lot more pics of it.




This pic is before welding it all up. I also cut some of the ends sticking out off the crossmember before welding up. The pic above is after final welding though.

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Old Apr 17, 2010 | 09:16 PM
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//<86TA>\\'s Avatar
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Posts: 12,812
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

hmmm, not sure how well that will withstand twisting, but i guess we'll see
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Old Apr 17, 2010 | 09:21 PM
  #12  
built91Z28's Avatar
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Joined: Feb 2010
Posts: 1,446
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From: Orlando
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: Has anyone fabricated a T56 "Hump Style" crossmember?

Its braced on both sides. I have more pics in my T56 swap thread at the bottom of the page. I also have solid motor mounts so its not going to be twisting much anyways. Its also made out of 3/16" steel so its fairly thick metal.
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