here is the story, i bought a project car (85 firebird) with no engine or trans, but came with trans crossmember and driveshaft
my question comes in where i dug the crossmember out of the hatch and it is definately custom, made so that there is a torque arm mount on it and put there very solidly, and the driveshaft seems thinner than what i remember mine being on my 89 camaro, so i am wondering if this is most likely setup for a th400/350 setup also i have not found a tv(kickdown) cable in the car
the car is an ex-v6 and someone at somepoint changed to a carbed v8
or did someone just possibly throw a 700r4 with a tailshaft that doesn't have a torque arm mount on it
i can get driveshaft measurements, pics, or any other measurements someone might need either tomorrow or thursday if needed

what ever information i could get on this would be great, because i have not made my mind up about what tranny will be going in the car yet, at some point i want a moderatly powered engine in it, prob. between 300 and 400

 

well i think after doing some more searching on the site that this is prob. setup for a th350 9"

 

 

I did something like that to my old 84 if you do a shift kit and 300 to 400 HP be careful. I used 1/4" angle iron it snaped and tore a hole in the floor board and almost cut the break lines

 

how does a crossmember take that much tension that it could snap angle iron, and to be clear i am not doubting you, i am just curious

 

when the trans shifted it used to break the tires loose in all gears, dont think that helped the cause too much. I think that was most of the problem repeated shock though the angle iron lasted about 3 months on the car before it broke. I drove that car pretty hard at the time.

 

not that i do not believe you, but shouldn't welds hold up to atleast 10'000 psi tensil stregth if properly done

 

it wasnt the weld that broke the angle iron broke just past the trans crossmember about an inch from the end of the weld

 

ah i understand now