Hi wetwilly5757, Thanks. The disc brake set up is stock on this axle. One of the reasons I am happy the way things are going. I recently talked to my spring shop techs and they are going to help make some new bushing for the front king pins when I swap to a modern spindle with discs. Grigg's tech info is great and I am going to do just that. The tolerances for the new vs old king pins for me are just .07". The spring shop guy said they have a guy that can make those bushings in the shop no problem. I'm getting excited to do that too. I just need to find a source for spindles for a P30 step van now. I see lots of hardware and such, but no spindles.
Tango, yes this is a Dana 80 from a 2001 HD3500 truck. I'm running a rebuilt 454 and the SM420 transmission at the moment, but going to do a TH400 when I find the right one. I think it would be good to put it in first. Then I won't have to modify the driveline more than once. I'm looking for one out of a Motorhome to match the weight it is pulling. Then if I want to put in another gear I'll add an overdrive unit. We'll see how it goes with just the TH400 first though.
Just got the new Ubolts yesterday so more work this weekend.