Open the cover, count the teeth on the big gear ( the ring gear ) next count the teeth on the small gear ( the pinion gear). Divide the big gear by the little gear and that is your ratio.
I get around 17 mpg with my g20 with the 350 motor \3.42 rearend
14mm is the thread size.
I have a 1999 Suburban-JB6 brakes. The drum size is 11"
Tire size is 235's. That is the stock size.
8.6
16 in.
42 gallons
9006
15 inches
215/70r15
16 inches.
195/75/R15