There are three ways. 1 A dealer can normally tell from the vin number. 2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement info. 3 You can count how many times you have to turn the driveshft to get one complete turn of the tires.
Absolutely.
C20 was Chevy's designation for a 3/4 ton. 2500 was GMC's designation for a 3/4 ton. Basically they are the same.
from a library
Yes.
134 freon
SAE 10W30
3/4 ton.
Might say on title
Before 1998 - no. 1998 and after - yes.
No it doesn't it has a straight Axel
all you can get, depending on the shape and how well it runs
8 degrees BTDC-- Before top dead center.