Back in 1970 at the Dodge Shop we were told the 60 could only be spread maybe 3 times then a new housing. Told this by the Dodge rep and it was in the book too. I asked him why couldn’t you use the ‘spreader’ to pull it back once the case was empty? He just looked at me and shook his head while walking away.
I use a long crow bar to get them out then a big hammer to drive it back in, tighter shims on the back side of ring gear, pinion holds the other side tight. Use checker bearings and original Miller set up tools, inch pound TQ wrench to check preload. Piss poor design but cheaper than making adjusters like an S60, 8-1/4, 9-1/4 8-3/4, 9”