What type of Manual 5 speed transmission does a 1988 GMC S15 Jimmy 4x4 uses?

[PhantomGrafix]

The engine size is a 2.8 liter v-6.

 

[PaulK]

Borg Warner T5. Important to note that the truck version of the T5 is very different than the car version (found in Mustangs, for example) and are not interchangeable.