The SRT-10 trucks do have Dana 60 rearends. The diesel trucks haven't used a 60 REAR in a LONG time (or ever?), just for the front axle. I know my '01 has a Dana 60 front, but Dana 70 rear.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax