Exterior Badges:
88-91: EFI sticker on lower right corner of tailgate.
GMC:
88-91: Large GMC letters on the center of the tailgate, tailgate width chrome bar was also used to mount the GMC letters to the back of the tailgate.
92-97: GMCTruck in the lower right corner of the tailgate with chrome letters and charcoal surround. Sierra was badged on the lower left corner of the tailgate, also with chrome letters and a charcoal surround.
98-00: GMC in lower right corner of tailgate with chrome letters and charcoal surround. Sierra badged on lower left corner of tailgate, again, with chrome letters and charcoal surround.
88-96: C-Pillar badge is square.
97-00: C-Pillar badge is square with rounded edges.
Chevy:
88-97: Chevrolet on tailgate width chrome bar.
98-00: Chevrolet Silverado badge on lower right corner of the tailgate.
88-97: C-Pillar badge is square.
98-00: C-Pillar badge is square with rounded edges.
Engines:
Six engines were used between 1988-1998.
The 4.3, the 5.0, the 5.7, the 7.4, the 6.2, and the 6.5.
(6.2 and 6.5 were diesels with the latter having a turbo option)
I will illustrate the history of the 5.7L here as it is the most common among GMT400 enthusiasts and owners.
The LO5 was introduced in 1987 for use in GMT400 and still continued older body style K5 Blazers and Suburbans. The Bore and Stroke of the LO5 was 4.000 in x 3.48 in.
Its factory applications included:
1992/1993 Buick Roadmaster
1990-1992 Cadillac Brougham (opt)
1993 Cadillac Fleetwoodfever
1992/1993 Chevy Caprice Wagon (opt)
1993 Chevy Caprice LTZ
1992 Olds Custom Cruiser Wagon
The LO5 was replaced by the GM LT1 after 1993 in B-Body cars until LO5 production ceased in 1996.
The Vortec 5700 L31 is the last production Gen I small-block from Chevrolet (GM). The cylinder heads feature combustion chambers similiar to those of the LT1, but with reverse flow cooling. The L31 heads are compatible with older small-blocks. Vortec heads however use four bolts attaching the intake manifold as opposed to the older and traditional six bolts per head. 2005 model year was the final year for the L31, used in the Kodiak and TopKick, whose small block origins date back to 1955. The Bore and Stroke of the L31 was 4.000 in x 3.48 in.
The L31 produces 255 horsepower and 330 ft lbs of torque.
Its factory applications include:
1996-2003 Chevy Express / GMC Savana
1996-1999 GMT400s (C/K, Suburban, Tahoe-Yukon)
The L31 used TBI in its G-Series vans in 1996.
(also used in Isuzu Box Trucks)
F44 package. Factory 14b 9.5 rear with 1500 Badging but Higher GVW and Bigger rear brakes. And + 1 more leaf spring in the pack. Pretty sure this was available from 88-98 in GMt400 trucks but 88-94 they were badged as 2500's but Still 6 lug just with the F44 package.
95+ F44 trucks were badged as 1500 but were identically equipped to 88-94 trucks.