Bullet proof GM 12 bolt.

[Captainfab]

The TBSS ' have 9.5 SF 14 bolts under them?

I would go with either a Dana 60 or the 9.5 SF 14 bolt, and have it shortened to your needs. The Dana 60's are very common under F250's and the 9.5 SF 14 bolts starting in mid 80's GM C20,K20 and the 2500's from '88 and up.

Originally Posted by 68GMCCustom

I too am wondering about rear ends..............truck rears that is.
Can't argue with the toughness of a 9"...also can't put a blue oval part on my GM truck.

Currently have a rebuilt truck 12 bolt with new Eaton posi, 3.73 gears, and "bearing saver" bearings. Running street 275/60-15 BFG's on 8" wheel, but I want to go to a wider 29"-30" tire, preferably MT ET Street drag radials and 4.11 or maybe 4.56 gears. Have a line lock, but its not currently installed. My 6.0L LY6 should be making over 500hp at the crank and is running thru a "built?" 200-4r, and I may add some spray....or preferably a Vortech supercharger later.


That said.......what is the "better GM" choice for a rear end tuff 'enuff to get beat on at the track by a 500+hp motor and sticky tires, yet still be up for street duty for weekends, cruises, long tours, etc. I know I'll also have to do a bit more for my 200-4r (or replace it) for it to live long. As for a rear diff.....I've always thought I'd choose a Dana 60......but the 9.5" 14 bolt semi-floater in our TBSS has me thinking about one of those.