LS1/4L60E in a chevelle....???
Last edited by 72ChevelleConv.LS1; Sep 7, 2005 at 12:02 PM.
Borrow a cheap GPS and in 2-3 days you will know your speed exactly with the tach.
For me with 3.90s and 25.5" tire-
4th = 20 mph for every 1000 rpm
6th = 40 mph for every 1000 rpm (IE 2000 rpm = 80mph)


what he said 