Is my rear axle equipped from the factory with a 8.5"? I have a 97 K1500 SWB with the 5.7 with a 10 bolt, 6 lug, semi float, 10" drum brakes. My concern is not about getting a heavier duty rear axle. My only concern is getting rid of these junk 10" rear brakes. So far, Ive been searching for rear axles out of 2whl 2500's. What should I be searching for in order to find the 8.5" with 11? I would be willing to drive to Bardstown Ky, but want to exhaust all options here locally.
Your truck has an 8.5 inch rear.
If you want another 8.5 inch rear with 11 inch brakes, they’re fairly easy to come by.
You want one from a 4x4 (K1500) so that it’s got the proper width.
A truck with RPO JB6 will be equipped with the 11” drums.
The heavier duty (2500/3500) trucks came with 9.5” and 10.5” rear gears.
Check your rear end ratio, I’m guessing you have 3.73 but the RPO code in your glove box will tell the tale. 3.73 rear gears are fairly common in pickups, Suburbans and some others might have 3.42.
If you can’t find one locally, or you want someone who will work with you, the fellow in Kentucky is a nice guy to work with.
