Dana S130 now. Was a Dana S110, yes.
Edit:
Funny sequence of events. 04 was the cutover year between dana s135 and the Dana s110, but both were still a funky 8 lug pattern from the earlier years. 05 went to a 10 lug Dana s110, and my 05 parts truck was used to convert my 04 to 10 lug. 10 lug hubs bolt right onto the 04 spindles.
The diff I bought just recently, and installed last night, was advertised as a Dana S110 4.30 lsd diff, and shipped to me with the differential and axle shafts. Upon receipt, I realized that the new axle shafts were 36 spline, not 34 spline like s110s. Dana s130 (not s135, s130) was introduced in f450/550 trucks in the late oughts, early '10s, as a slightly higher weight capacity axle, using the same brakes, bearings, axle housing, etc. Only difference is a tad larger ring gear, and 36 spline axles instead of 34. Capacity benefit doesn't really matter to me, as I'd never max it out in original config, let alone this new config.
Anyway, now I effectively have say a 2012 Dana s130 axle in my 04 truck, with less than 80k miles on it (new wheel bearings and brakes last year) that should go down the highway much nicer than before
