Anyone make a cross member?

General topics not pertaining to one particular type of engine, or topics regarding non-Cadillac engines.

Anyone make a cross member?

Postby PJ McCoy » Thu May 04, 2017 2:49 pm

As the subject title says,
Any ideas. I have the trans bolted in place and a jack stand on the tail of it.
Hacking up the trans mount for the 350? flipping ect.
Build one from scratch?
Issues to look out for?
Type of material to use? i.e. square or round
Thanks, PJ
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Re: Anyone make a cross member?

Postby Darius » Thu May 04, 2017 5:00 pm

PJ McCoy wrote:As the subject title says,
Any ideas. I have the trans bolted in place and a jack stand on the tail of it.
Hacking up the trans mount for the 350? flipping ect.
Build one from scratch?
Issues to look out for?
Type of material to use? i.e. square or round
Thanks, PJ


Howdy PJ,

I modified an old store bought one to make it suit my needs. After having that experience, and seeing how totally easy the process was, I plan to make the next one for the "married" transfer case/transmission deal. The existing round cross member will be joined with a second cross brace a few inches back in order to support the 80 pound weight of the transfer case.

Round, square? Go with what looks right with what you already have.

Best,

d
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Re: Anyone make a cross member?

Postby 76FleetBrougham » Thu May 04, 2017 5:13 pm

I built my own. some 3/16" leftover angle bolted to the frame on the stock mounts, some 1/8" wall 1-1/8" tube. Jack the trans tail ever-so-slightly higher than you want it (1/8"?) to account for rubber bushing compression. Then bolt in a new bushing and mount plate to the trans, fit the tube so it fit the angle tight, but not too tight. Hold the tube in it in place with magnets so it lines up with the trans bushing mount, then tack and weld up. The trans angle ended up exactly where I wanted it when I put it all back together. Still working great.
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Re: Anyone make a cross member?

Postby Ted in Olympia » Fri May 05, 2017 2:26 pm

I made my own and I most likely made it heavier than needed. But the Cadillac puts a lot more weight on the rear crossmember since the from motor mounts sit foreword more than most engines. On a small block chevy the front mount are almost in the center and the engine will rock on them with the transmission out, not true with the 500.
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Re: Anyone make a cross member?

Postby 8ad-f85 » Sat May 06, 2017 8:48 pm

For Firebirds converted to thm400's I've both moved the x member back the 6.75" ....or flipped the mounting bracket while leaving the x member in the same as factory place.
Either way was fairly simple.
I wouldn't mess with it any other way, you'll just spend a lot of time on it.
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Re: Anyone make a cross member?

Postby PJ McCoy » Mon May 08, 2017 6:17 pm

Yeah, it seems the short shaft trans has me in a mess. I have a PLAN!! I need to move the mount 4-1/2 inches to the rear. I have cut the X-Member pad and will weld it on the rear. The trans pan hits the X-member before the holes line up on the frame. :grumpy: So i took tons of measurements today and will now cut the member and add in a plate that is 4-1/2" long. I will post some info and pics soon.
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Re: Anyone make a cross member?

Postby pila78 » Tue May 09, 2017 11:51 pm

Some folks on another forum have used a Ford Crown Vic cross member, and trimmed the ends to get the length needed etc...
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Re: Anyone make a cross member?

Postby 8ad-f85 » Wed May 10, 2017 8:35 am

Good idea!
I did use a mustang(?) type one for a caddy full size that didn't have the double hump for duals.
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Re: Anyone make a cross member?

Postby PJ McCoy » Thu May 11, 2017 6:20 pm

Bill thats a great idea.
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Yeah I know my welding needs help
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Trying hard to figiure it out just not working for me, hahaha
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I believe this will hold well just looks bad.
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1981 Pontiac Trans Am Powered By A 1976 Cadillac.
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Re: Anyone make a cross member?

Postby PJ McCoy » Thu May 11, 2017 6:28 pm

Hey Guys i upgraded my cheap harbor frieght welder. Well not really. I just added a bigger gauged wire so i can move the welder around the garage. Like under the car to tack weld the brace. Made it so much easier. Should have done that years ago. :metal:
Oh Yeah, CAYSIE says, HI YA'LL!
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The small wire is the main power from Chicago Electric. The BIG WIRE is from PJ McCoy
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Re: Anyone make a cross member?

Postby PJ McCoy » Fri May 12, 2017 4:24 am

PINION ANGLE
Icrabtree posted this link for pion angle back in aug'16
Im reposting his link for others. I think its good info and im going to us it this week end.
https://www.iedls.com/#Power_Train

PJ
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Re: Anyone make a cross member?

Postby pila78 » Mon May 15, 2017 6:50 pm

Your little girl is a cutie PJ !! Thank Heaven for little girls ! :D
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Re: Anyone make a cross member?

Postby PJ McCoy » Mon May 15, 2017 7:37 pm

pila78 wrote:Your little girl is a cutie PJ !! Thank Heaven for little girls ! :D

Thank you so much.
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