Auto Trans Crossmember - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tdangle** · 10-18-2022, 11:18 PM

Are the replacement crossmembers that only bolt to the bottom portion of the frame as strong as the pain in the butt factory one that bolts to the top and bottom of the frame? I wonder if the factory did this as an additional frame brace.

**tdangle** · 10-20-2022, 07:19 PM

Hmmm, after over a 100 views I would think someone would have an opinion at least.

Accelo · 10-20-2022, 07:57 PM

It might affect the torsional stiffness of the frame.
However, the effect should be minimal.
I used to drill out the rivets and replace them with bolts.
A lot easier to deal with than spreading the frame and hammering them in.
The later GM trucks had bolts in them from the factory.
Cheers.

tim_mc · 10-21-2022, 08:07 AM

Just a tip when relocating the factory trans crossmember - I used a longer drill bit to reach from the bottom to drill the holes through the top frame rail. It wasn't bad at all.

1967-C10 · 10-21-2022, 09:22 AM

cars, corvette and camaro bolted in using bottom of rail only.
Never heard of a failure in this area.
The early C10 frames were built like a tank.

10-18-2022, 11:18 PM	#1
tdangle Senior Member Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,210	Auto Trans Crossmember Are the replacement crossmembers that only bolt to the bottom portion of the frame as strong as the pain in the butt factory one that bolts to the top and bottom of the frame? I wonder if the factory did this as an additional frame brace. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC

10-20-2022, 07:19 PM	#2
tdangle Senior Member Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,210	Re: Auto Trans Crossmember Hmmm, after over a 100 views I would think someone would have an opinion at least. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC

10-20-2022, 07:57 PM	#3
Accelo Registered User Join Date: Mar 2015 Location: washington Posts: 2,177	Re: Auto Trans Crossmember It might affect the torsional stiffness of the frame. However, the effect should be minimal. I used to drill out the rivets and replace them with bolts. A lot easier to deal with than spreading the frame and hammering them in. The later GM trucks had bolts in them from the factory. Cheers.

10-21-2022, 08:07 AM	#4
tim_mc Registered User Join Date: Jan 2019 Location: St Peters, MO Posts: 435	Re: Auto Trans Crossmember Just a tip when relocating the factory trans crossmember - I used a longer drill bit to reach from the bottom to drill the holes through the top frame rail. It wasn't bad at all. __________________ 1967 C20, 350 SBC w/Comp roller cam, 700R4 w/3.42 posi, PS, 4-wheel PDB, Old Air AC & GM Tilt column.

10-21-2022, 09:22 AM	#5
1967-C10 Registered User Join Date: Mar 2022 Location: Round Rock Texas Posts: 104	Re: Auto Trans Crossmember cars, corvette and camaro bolted in using bottom of rail only. Never heard of a failure in this area. The early C10 frames were built like a tank.



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