The iconic “mushy” brake pedal on vacuum-boosted GMT400 trucks isn’t a design flaw or an accidental failure of aging parts—it is the deliberate side effect of GM’s early “Low-Drag” braking architecture. If you own a vacuum-boosted GMT400 (1988–1998 Chevrolet/GMC C/K series truck or SUV), hitting the brakes can often feel…
Category: 1989
1988
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L19 454 : Big Block Workhorse
The L19 was available from 1988 to 1995 in 2500 and 3500 trucks, and also in the 1990-1993 SS454 C1500. The general specifications remained very similar for its entire run, other than a block redesign to to new Mark V architecture in 1991.
1988
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CUCV II : GMT400 joins the Military
A rarely seen model is the 1987-2001 CUCV II, the militarized version of the civilian GMT400 platform. Only purchased in small numbers by the US military (Only number I have found in my research is around 800 units), with over 3,000 ordered by other governments across the world.
The CUCV II was a modernization of the more well know “squarebody” CUCV. Based almost directly on the civilian version, only specific changes were made for military use. CUCV II’s were not inherently more heavy duty than what was available to everyone else from their local GM dealership.
1989
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1989 Model Specifications : The Z71 is here
The 1989 model year featured only minor revisions from the previous year. Pickup trucks still remained the only body styles available in the GMT400 platform.
Here you will find specifications and information for 1989 model year Chevrolet and GMC full-size trucks.
This includes engine ratings, drivetrain specs, and chassis dimensions.
1989
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1989 Chevrolet Pickup Dealer Info Sheet
Documents supplied to dealers for vehicle ordering.
Options, specifications, RPO codes.
Scan quality varies.
Excellent source of what was available from GM for 1989 model year.