New to the site, thought someone might like to switch from the 4.11's to the 3.21's with gas prices lke they are! I got 15mpg with a Pontiac 400/TH400. I recently did a dually conversion with a 3.73 posi rear from a 93 1-ton stakebed truck. The 3.21's were installed in the original '81 rearend about 5 years ago. It is in perfect condition, just change the fluid and go. The brakes are included (13"x2-1/2" stockers). The drums are very good but it could use a new set of shoes. $500.00 obo. Pick up in Atlanta or shipped anywhere for about $200.00. It is out of the truck, on a pallat, ready to ship.