Does anyone know what the torque specs for the 4 big bolts that hold the rear cross member in place?

 

i'd go with 90 ft/lbs

seriously

 

W/ 1/2" impact gun, a hammer and then a hammmer, is good. Dude, it a crossmember, get it tight, but don't break those bolts off (doubt you could, but still).
The only thing I torque is engine-wise, and even then for rotational parts. I torque wheels, I torque flywheel/pressure plate bolts, cam valve train, engine train, and that's about it.
You gotta learn the feel of what torqued is... and not stretching the crap out of bolts.
Absubtle
CO