Just found that. It is a Dana 60 with 3.55 gears standard differential.
I have had this rear rebuilt 6 times in 560k
Looking to upgrade to 70 with 3.73's and disc brakes or is this 60 worth rebuilding again
Wow, 560K! Still, with 6 rebuilds IMO the D70 with a bigger ring and pinion would be more durable. I'm sure others more knowledgeable than me will chime in.
__________________
2005 E350 RB 6.0 PSD for extended fun
1989 Landcruiser FJ62 for local fun
2011 VW TDI Golf for hwy fun