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Just curious to know if "K5" was some kind of option on the '89-91 full-sized Blazers and Jimmys. Or is that just a kind of general reference like "S10" or "A-body"?
K5's are actually any fullsize Blazer from 69-88. 89-91's are V5's. All it is is a code number just like K-1500 is a 88-present 1/2 ton 4x4 truck and C-1500 is a 1/2 ton 2x4 truck.
Actually .. the S10 is a Chevy... the S15 is a GMC.
Additionally, even though they all said either S10 or S15 but (its been a long time since I dealt with them, so take it for what its worth) S=2WD and T=4WD