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In 3500 series 88 was the last year for the 4.8L. The 4.8L was still a carb motor in 88. It was also the last year for the 6, either inline or v6. The 4.1 was never available in 3500.

In 2500 series 84 was the last year for the 4.1, 88 was the last year for the 4.8L (carb motor). It was replaced by the V6 in 89.

In 1500 series 84 was the last year for the 4.1L. In 85 it was replaced with the V6. Side note, 85 and 86 were carb motors, 87's were Fuelie motors.

This above only applies to US Square trucks. Mexican Square trucks were carb (and reg fuel) till 91. I don't have a break down of engine choices of Mexican trucks, sorry. All 88-up NBS US trucks were Fuelie motors.

4.1L 250 ci

4.3L 262 ci

4.8L 292 ci