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**THI** · 03-25-2026, 08:41 AM

If you are already turning it from 2WD to 4WD it is no longer "original" anyway so why worry about the axles not being correct for a 1985? Just my opinion for what it is worth.

You will either need to find a doner frame to get the parts you need or a complete rolling chassis. Also as mentioned you will need the center hump from a 4WD truck or heavy duty C20 or C30 for the clearance of the driveline. Also, 1985 was the changeover year for 4WD crossmembers to the newer "W" shape crossmember and shorter t-case adapters.

03-25-2026, 08:41 AM	#5
THI Senior Member Join Date: Jan 2017 Location: Traverse City, MI Posts: 221	Re: C10 to K10 conversion If you are already turning it from 2WD to 4WD it is no longer "original" anyway so why worry about the axles not being correct for a 1985? Just my opinion for what it is worth. You will either need to find a doner frame to get the parts you need or a complete rolling chassis. Also as mentioned you will need the center hump from a 4WD truck or heavy duty C20 or C30 for the clearance of the driveline. Also, 1985 was the changeover year for 4WD crossmembers to the newer "W" shape crossmember and shorter t-case adapters.