The base engine used in the Sierra was 4.3 liter V6 engine that produced 160 horse power and other optional engines were the 5.7 liter and 5.0 liter models.
All the models came with the antilock rear brakes and were offered in either the 6-speed automatic transmission or the 5-gear manual transmission.
Here are some cool Pictures of 1990 Gmc Sierra
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