[nxtruck]

The " half of the teeth are gone" part sounds like what happened to me. I'm assuming you are running a spool and a/m axles. When you said that you leave at 4000, is that with a transbrake or foot-breaking? Powerglide or 3spd? If you're running a brake, this changes things some. If you don't load the driveline before setting the brake, this could be the result. If you're footbraking, however, I don't see any reason why the street gear wouldn't work. I spray mine out of the hole without any problems, foot-braking it BTW. The things I'd recommend to make it live would be a spool, 33 spline axles, a braced rear cover, studs in place of bolts in the caps, and possibly weld the tubes to the center section.