by Nighthawk » Sat Mar 18, 2006 10:34 pm
3.7 :1 means that for every 3.7 turns of the prop shaft sending drive into the diff, the diff's crown wheel does 1 complete rev.
so you can imagine that the 5.8 is revving a lot higher to get a similar road speed as yours. They are over 4k rpm at 70mph