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Below is a list of the years of the spindle and knuckle you’ll need for a Chevy disk conversion to run Ford hubs on it. Do note all the differnet knuckles!
BOM......Year........Truck..............Spindle........Knuckle......Inner Wheel bearing
Chevy Truck
603374...73..........K5 or K10..........706528x......706135x......705110x
603354...74-75.....K5 or K10..........706528x......706135x......705110x
603706...76..........K5 or K10..........706528x......706484x......705110x
603676...76 1/2....K5 or K10..........706528x......706116x......705110x Jeep
603462...74-76.....Wag & Cherokee..706528x......706135.......705110x......Disk Brakes ONLY!
603633...75-76.....Cherokee Chief..706528x........706135.......705110x
603646...74-76.....J10 Pick-up.......706528x.........706135.......705110x......Disk Brakes ONLY!
Note, last BOM for J10 may be 603464.
any other circumstances (reasons) that you know of during the same time period that they swittched to 6 lug? ex: did 6 lug start when they started putting model 20's in the back?