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GMT400 History

The power ratings on the 1996 Vortec powered trucks differed slightly from the '97-'99 trucks due to a software change in the OBD 2 system 1996 5.7 L V8 was rated at 250 hp and 335 lbft of torque the '97-'99 5.7 L V8 changed to 255 hp and 330 lbft of torque the 1996 5.0 L V8 was rated at 220 hp...
- Reyosito
- Post #175
- Dec 18, 2014
- Forum: Engine Performance + Maintenance
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GMT400 History

Research and Development on the 1988 GMT 400 trucks began in October of 1983 Production began December 8th 1986 and they were introduced April of 1987 some of the production plants had not changed over yet and were still producing the 73-87 bodystyle trucks in January and early 1987 therefor...
- Reyosito
- Post #174
- Dec 18, 2014
- Forum: Engine Performance + Maintenance
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GMT400 History

Just for fun I'll post all the exterior factory colors of the 1988 Gmc Sierra and Chevrolet C/K since that was the first year of these great trucks #1 Spice Brown Metallic #2 Adobe Gold Metallic #3 Sandstone metallic #4 Iced blue metallic #5 Pacific blue metallic #6 Summit White #7 Brandywine...
- Reyosito
- Post #173
- Dec 18, 2014
- Forum: Engine Performance + Maintenance
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GMT400 History

Of significance and usually overlooked the first run of the 1988 GMT-400Trucks had lines between the gages GM revised the gages in January 1988 I believe all trucks manufactured in 1987 as 1988 trucks had the lines between the gages also i noticed there is no mention of the factory steering...
- Reyosito
- Post #169
- Nov 27, 2014
- Forum: Engine Performance + Maintenance