Originally Posted by madscientist
Originally Posted by Chip
I dropped my big block RB 775hp stroker engine in my 70 Barracuda this weekend.

When I got the car it had a 383 425hp engine with front aluminum motor plate and a stock style automatic 727 transmission mount with the rubber. That's it.

I now have added solid steel motor mounts (stock k-frame car) on both sides along with the same front motor plate. (no mid plate) I can not find a solid transmission mount.

I could just fabricate a solid transmission mount i guess.

What do you guys run for transmission mounts for the 727 auto?



I've always used a rubber mount under the transmission, even with solid front mounts or a motor plate. Never had any issues with it. I've always "heard" that solid mounts in all three potions would cause the transmission case to fracture. Can't say if that's true or not, and it probably isn't. I just never did it.


Depending on chassis rigidity will determine how long it will last but in the majority of cases you will fracture the extensions housing.