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Discussion Starter · #1 ·
Hi there,

I have a G-body (79 Malibu) that I want to build a replacement transmission crossmember in an effort to reduce some weight. The stock piece notched and boxed is pretty hefty. I'll know exactly how much once I take it out again.

Anyway, by the space available, I can squeeze in a 1 1/4" diameter tube side to side. If I measured and looked at it correctly, it should be able to be made to fit straight accross side to side with no bends. I will use 4130 chromoly and Tig weld all the end brackets and trans mount. I'm not sure what wall thickness should be used.

The tube will be 48" long and supported on either end of course with the th400 resting in the center (Duh!).

I was thinking of using either .083" or .095" wall. Which would be most appropriate given it's quite wide. I'm gonna guess .095", but felt I should ask an expert.

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