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Powertrain & Performance
- The EFI Transition: In 1986, the base engine shifted to the 4.3L LB4 V6 (140 hp), which featured throttle-body fuel injection. However, the most popular choice remained the 5.0L (305 cu in) V8, which transitioned from the carbureted LG4 to the fuel-injected LO3 in 1989, delivering approximately 170 hp and 255 lb-ft of torque.
- Transmission: Most civilian models were equipped with the 700R4 (4L60) 4-speed automatic with overdrive, though some base fleet models carried the 3-speed Turbo-Hydramatic 200.
- The 9C1 Police Package: This legendary variant featured the beefier 5.7L (350 cu in) L05 V8 (standard by 1989 for police), heavy-duty suspension, extra frame bracing, and a high-output alternator to handle emergency electronics.
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