Allison Transmission 3000/4000 4th Generation description of the catalogue:

Allison Transmission
ALLISON 4TH GENERATION CONTROLS
VOCATIONAL MODELS

4000 EVS
4500 EVS
4700 EVS
4800 EVS B 500
4000 HS
4500 HS
4700 RDS
4800 SP T 425
4000 MH
4500 RDS
4700 SP
T 450
4000 RDS
4500 SP
T 525
4000 SP
4000 TRV