I have narrowed 6 or 7 truck Dana's over the years. the 60's 1/2 ton Ford ones I have tried to use were bent so badly, that i quit getting them, not sure if they were that much lighter, or just badly abused farm trucks. Have had good luck with the 3/4 ton Dodge and Ford rears. And as mentioned Dr Diff has all the parts. I usually just use 8 3/4 ends unless somebody requests otherwise. The S-60's adjusters are real nice if you do not have the pullers and spreaders, but definatley cheaper to go the truck route. Jim