8 degrees BTDC-- Before top dead center.
on the top side of the steering column under the dash
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
134 freon
Yes.
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