According to Ad-Engineering:
Q: What is the best year S10 frame to use?
A: The S10 frames are very similar. We have customers using frames as early as 1982 to as late as 2002. My
preference in frames has evolved to include the later model frames that have the parking brake cables both
routed down the drivers side. This makes it much easier to adapt to the stock AD truck park brake pedal.
Also:
1982-1983 Does not have a spare tire winch built in / No ext. cabs available
1985 Fuel Injection begins on the 2.8L V6
1988 4.3L V6 with EFI introduced
1989 Rear ABS introduced
1991 Turbo charged AWD GMC Syclone introduced
1994 ZQ8 Sport Suspension package introduced / New body style introduced
1996 Four wheel ABS available on all S10's
1998 Four wheel disc brakes
1999 S10 Extreme introduced