I have read some about converting the rear axle to something more current and the overall width being a problem but how much wider are they and what fender modifications are typically done to accommodate them?.
I have a 3600 running 30” tires, I’m looking to go to a 3.73 FD to raise my cruise speed. You can swap to a 14bolt for pre 85 trucks pretty easy. The hub to hob with will be the same 72” bit the wheel mounting surface differs between axle versions. You’d want to find one with no wider than a 67” wms-wms. Then any fine tuning to tuck the tires can be done with wheel back spacing.
