Sorry alittle more info would have helped. 96 F350 Crew cab 4x4 w/460 (not heavyduty). auto hubs. auto tranny. shift on fly. I hear a loud clunk when in 4WD. After many beers and alot of sitting on my ****. I think it maybe the hubs. I do know they are a problem for Ford. It may have been the cold and lots of snow we had.

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Thanks
Eric Adams