Whats the best easiest way to tell the difference in a dana 50 and a dana 60 in the front of a duper suty??? 99 Dually f350 . My search revealed nothing to help,maybe my searching skills bring teh suck!!

Pinion nut sizes are different, i dont know what the measurements are though for them.

If its a dually......most likely will be a Dana 60. Only the SRW truck of that era got the D50 front ends

If its a dually......most likely will be a Dana 60. Only the SRW truck of that era got the D50 front ends

Ditto. Somewhere in 2002, all SD's came with the D60 front

The dana 50 will have an 1-1/8" pinion nut whereas the 60 has an 1-5/16" nut.

Aside from that, the rest of the differences are inside.

If you have it apart the necked down inner axles are a dead give away.

Diff cover- while the bolt pattern is the same,the dana 50 cover is kind of "stepped down" around the ring gear and wont fit on a 60. The larger diameter of the 60 ring gear requires the full diameter cover bulge. I might be doing a sorry job of explaining it, but if you compare the two, it's easy to see.

Being a 350 dually though, it SHOULD be a 60.

One of them should have a rainbow mark cast into the pumpkin.

Thanks for the help, will compare some covers in the local walmart parking lot!!! and measure my pinion nut to see if I gots a 60 jim

One of them should have a rainbow mark cast into the pumpkin.

:D nice... :rainbow:

housings are actually different...D50s pinion snout is 1" shorter. You can tell just by looking at them from the top.