Quote: I don't want to hurt fealings or step on toes but with his set-up IT WILL BREAK!
Any diff can break with enough abuse.
I speak from experience 3800lbs 69 Roadrunner with a 10" slick, 5 speed, Cal-Tracs, around 650lbs/ft torque. I have broke axles, bent things on a Dana 60. The 8 3/4 would have destoyed it self long, long ago.
I wouldn't recommend an 8-3/4 to anyone but everybody knows that.
This has been discussed by you and I before Quicktree. I'm still using one in my 67 Belvedere running low 10s. It weighs at least 3750 lbs race ready. Leaving at approx. 2000 rpm. 1.42 60 ft so I'm not beating it at the hit. Using Mark Williams axles, spool and Richmond gears. Like the Everready Bunny...still going. Happy Holidays!
I wouldn't recommend an 8-3/4 to anyone but everybody knows that. 
