47-55.1 TH400 transmission cross member / bracket vs TH350 for a Camaro subframe - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**mr48chev** · 09-16-2019, 01:43 PM

I think I would have made a recess for the mount to get it down to the height I needed and still have a mount.

With the way you have it, I'd suggest cutting another piece of rubber to put on the bottom side of the crossmember and cut and drill a piece of flat bar to have rubber on both sides of the crossmember to let the trans wiggle a tad. Pretty much like the donut mounts on TF stock engines where there there is a rubber piece above and below the mounts to act as a two way cushion. Otherwise when the engine torques you might overstress an ear on the extension housing.

**Gregski** · 09-17-2019, 10:21 AM

Quote:

Originally Posted by mr48chev

...With the way you have it, I'd suggest cutting another piece of rubber to put on the bottom side of the crossmember and cut and drill a piece of flat bar to have rubber on both sides of the crossmember to let the trans wiggle a tad...

that actually sounds like a brilliant idea, thanks mate

jmlloar · 09-18-2019, 04:38 PM

Quote:

Originally Posted by mr48chev

I think I would have made a recess for the mount to get it down to the height I needed and still have a mount.

With the way you have it, I'd suggest cutting another piece of rubber to put on the bottom side of the crossmember and cut and drill a piece of flat bar to have rubber on both sides of the crossmember to let the trans wiggle a tad. Pretty much like the donut mounts on TF stock engines where there there is a rubber piece above and below the mounts to act as a two way cushion. Otherwise when the engine torques you might overstress an ear on the extension housing.

I would be willing to bet that even with 2 pieces of rubber your going to break something. keep in mind that you need it to flex under throttle AND still give with frame twisted at the same time. I forsee mounting tabs on tranny cracking.

I would take the time and drop the crossmember down and use factory style mount.

An ounce of prevention is worth a pound of cure.
Or do it right the first time will keep you from doing it again.

09-16-2019, 01:43 PM	#1
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,838	Re: TH400 transmission cross member / bracket vs TH350 for a Camaro subframe I think I would have made a recess for the mount to get it down to the height I needed and still have a mount. With the way you have it, I'd suggest cutting another piece of rubber to put on the bottom side of the crossmember and cut and drill a piece of flat bar to have rubber on both sides of the crossmember to let the trans wiggle a tad. Pretty much like the donut mounts on TF stock engines where there there is a rubber piece above and below the mounts to act as a two way cushion. Otherwise when the engine torques you might overstress an ear on the extension housing. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.



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