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**Bob B.** · 09-11-2022, 01:55 AM

The C-30 probably has a 10.5 Corporate 14 bolt. It should be the right width but everything else will be wrong including the spring perches, U-joint flange, and number of wheel studs. I have never seen any 10 stud hubs for a 10.5 but I think there were (very rare) 8 stud 22.5" tubeless wheels. I think it would be a lot of effort with mediocre results. Plus what will you do with a rear axle-less C-30? Better to sell the C-30 and buy a Gear Vendors overdrive or maybe replace the SM-420 with a NV5600 5 speed overdrive (I think kits are available to bolt one to your bell housing). You got a nice truck there resist the temptation to turn it into a mechanical Frankenstein. Shortening the frame and mounting a pickup box can look really nice if done right and the truck is still somewhat useful. I think custom 9' stake beds with finished racks and floors are even better.

09-11-2022, 01:55 AM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,309	Re: Heavy Hauler Diff swap The C-30 probably has a 10.5 Corporate 14 bolt. It should be the right width but everything else will be wrong including the spring perches, U-joint flange, and number of wheel studs. I have never seen any 10 stud hubs for a 10.5 but I think there were (very rare) 8 stud 22.5" tubeless wheels. I think it would be a lot of effort with mediocre results. Plus what will you do with a rear axle-less C-30? Better to sell the C-30 and buy a Gear Vendors overdrive or maybe replace the SM-420 with a NV5600 5 speed overdrive (I think kits are available to bolt one to your bell housing). You got a nice truck there resist the temptation to turn it into a mechanical Frankenstein. Shortening the frame and mounting a pickup box can look really nice if done right and the truck is still somewhat useful. I think custom 9' stake beds with finished racks and floors are even better. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.