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Look for a 4x4 tow truck or small chevy dump trucks (4x4) usally have 60's up front
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The only problem with those is they're usually high mile, been worked real hard too...IMO the best D60 deals out there are still the Ex-M1008 D60's and 14 bolts. Good gearing, usually low mile and very little 'use'. The set I got only had 35,000 miles on them and had the gearing I wanted. The thought of paying $1000 for a diff I need to strip and rebuild was not very appealing.
Rene