Need an expert on 90s 3500hd dually trucks

[Henry Ford]

I have a '50 Studebaker R16 with 5.9 Cummins and NV5600. I was running the original Timken rear with 6.66 ratio and 8.25x20 tires. Although the rear axle looks beefy and designed to haul heavy loads, once taken apart, it was obvious the carrier was only designed to handle the 106HP of the flathead 6 the truck was equiped with new. I replaced the rear with a Spicer S130 out of a F550. The big hydraulic disc brakes was a nice improvement also. Good luck with your project.