tubular trans crossmember question

[70 Chevelle]

can anyone suggest tube thickness, diameter, material ? any help?

[CamaroAJ]

i have built a few with 1 1/2 square tube and the one on my car with 1 1/4 roll bar tube that i didn't use on my cage.
https://static1.pt-content.com/images/pt/2007/07/sweetcamaro006-1.jpg
https://static1.pt-content.com/images/pt/2007/07/sweetcamaro005-1.jpg

[chicane67]

1.25 to 1.5 x 0.060-0.095" round mild, DOM or chromo steel will suffice.

[jason@gmachine]

my vote is for 1.5" .065 wall 4130.


Jason

[Mathius]

I have a design question. Looking at my '76 Malibu, the tranny crossmember actually doesn't run directly under the tranny mount, but has a small arm that comes out and bolts to the tranny mount. Is there a reason for this? It seems to me that this creates a stress point where the little plate meets the actual crossmember, and it would be far stronger to have the crossmember run directly underneath the tranny mount.

I hope that made sense.

Mathius

[jason@gmachine]

i would run it directly under it, but im not familiar with a 76 malibu so hopefully someone can chime in and give a better answer.


Jason