Quote Originally Posted by greggbruceauto View Post
I've built 700's for 502, supercharged 383's (600 rwhp) and nitrous cars... have had a couple issues, but they're still running....
the planets are actually bigger than 4L80E, but the hard parts actuating things are different, and the 80E does have an extra planet in front for overdrive, it for sure is heavier duty. Will be good to know how stuff works out...
I tore the case lugs off the side of the case in one. Broke the "beast" sun shell in another and broke an aftermarket input drum in another. Each time it looked like a grenade had gone off inside. The weakest point gave out and when it failed, took the whole unit out. I had one that cracked in the bellhousing area as well on a stock 2.8 S-truck.

I picked up the ATSG manual on the 4L80E and plan to build it myself. I will let you know how it works out. The beefier OD is one of the main things I am after, since I plan to swap either 4.10 or 4.30 gears into it and will be towing in OD.