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franken · 10-25-2020, 02:16 AM

I think the early 60s trucks were very similar to 67-72 regarding the frame and WMS stuff. WMS means wheel mounting surface or the distance from where a wheel mounts to the other. Measure from rear drum face to the other to start. Look for a front diff w/ the same/close dimensions. The new diff has to have the same ratios as the rear.
73 and up fronts are supposed to be a bolt in for 67-72 but since you're 2x4 you need the frame mounts. The crossmember on a 4x4 is different.
Needless to say you need a TC and cut/new rear driveshaft and one for the front.
Power brakes has little to do with the conversion...

10-25-2020, 02:16 AM	#2
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,057	Re: 66 K30 Front Diff I think the early 60s trucks were very similar to 67-72 regarding the frame and WMS stuff. WMS means wheel mounting surface or the distance from where a wheel mounts to the other. Measure from rear drum face to the other to start. Look for a front diff w/ the same/close dimensions. The new diff has to have the same ratios as the rear. 73 and up fronts are supposed to be a bolt in for 67-72 but since you're 2x4 you need the frame mounts. The crossmember on a 4x4 is different. Needless to say you need a TC and cut/new rear driveshaft and one for the front. Power brakes has little to do with the conversion...