Looking for a little advice...
I have acquired a D35 w/4.11 and plan to swap it for my 3.07 gear. One day I'll go heavy duty but for now this is what I have. The diff obviously has a good amount of miles on it (don't know how many but it's a 1990) and opening it up things look good but the pinion felt like it did not have enough preload. I measured the backlash at .009", pulled the carrier and measured not more than 4 in-lb preload (with the seal still installed). There is no measurable play either laterally or axially in the pinion.
Question, would it be OK to run it with this light preload? I am assuming that the light preload is a result of years of wear on the pinion bearings and seal.