Since I added my notes for the Cherokee XJ, I figure I would add what notes I have for other Jeep models, though they are not as extensive.

Jeep Wrangler/YJ changes:

1988: Islander badge
new mirrors on both door styles

1991: Fuel Injection added to 6-cylinder
4.0L High Output engine replaces regular 4.0L
Renegade introduced
Electronic speedometer

1992: Square roll bar
Rear 3-point belts (the reason for the new roll bar)

1993: CHMSL
Anti-lock brakes (ABS) optional

1994: New mirrors on full doors
CHMSL

1995: Mid-year new hood design


So this is just a starting point. Feel free to add what you know to help us ID them on the main board!