Gm Muslecars Full Ladder Frame Breaking The Rear Crossmember Rumors Are True

B&R Racing

B&R Racing

solid fixture here in the forum
If Your Making 500 + Hp and 500 Ft/lbs torque Racing Running Super Hard Your going the Crack the Rear Crossmember Eventually.
The Crossmember that holds the Upper Control Arms.
Stories of the SD421 Catalina, Big Block Chevelles, Pontiac GTO All Years, 442, Buick GS 455 Stage 1 cracking Ripping out is True.

It needs to be reinforced up.

Broke it in the 1963 Grand Prix.
Spent all day repairing.
Its Reinforced 3/16" thick Plated now.
 
Last edited:
Getting ready to make the Last Rear Frame Rail Brace to strengthen the 63 Pontiac Gp Frame.
She took my abuse for over 20 years Reminiscing this morning.

I bought a spare 1963 Grand Prix Frame back in 2003 a full rolling chassis have it still .
Going to sand blast it, prep, paint this fall.
Reinforce areas I know need Beefing up.
Talking to Ed last night I want to add 4130 1-1/2" Chromemoly Tubing another crossmember up front and one in the Rear tieing in the lower control mounting points. Unique how it's done on the 63-64 Pontiacs.
All 63-64 Grand Prix's have a Heavy Duty Fully Boxed Frame stock.
Want it as strong as the 2000 Hp Street Drag Cars Eddie and me work on Frame Chassis mods we do with no Roll Cage.
They hold up track use No Prep Racing time clocks off.
 
Last edited:
100% Success Repairing the 1963 Grand Prix Rear Crossmember Frame.
What started off replacing the Front and Rear Shocks turned out to be a 3-day long project.
Its putting the 455 Pontiac power down clean again.
I think it's better now with the Rear Frame Reinforcement Brackets I welded on.
Tap the gas it burns rubber hooks up quick lurches forward with Authority.
 
https://pin.it/1Gj6V8g

Relaplaced the Pinion oil seal today and crush sleeve along with a 9.3 Pontiac Companion Flange I bought NOS and painted up.
Been wanting to do that for 5 years it's done today !
 
You must log in or register to reply here.
Back
Top