[Yukon Jack]

What is your axle ratio? That will have a bit to do with how well you can go 60-65 mph. My 69 K20 with 4.56 gears and 35"s is reving pretty high to hit 60 mph. I usually just drive at about 55 mph.

In relation to your steering question, with a closed knuckle axle you use an adjustable drop drag link to correct your steering. Skyjacker or Superlift has one available. That is what I'm using on my 69.