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For 1990-2009 cars only
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Automatic

AllisonĀ® transmission identification plates are located on the rear left side of the housing, just above the oil pan.

Allison Transmission ID
Object Number: 734423 Size: MF
(1)Indicates Planetary Gear Type Automatic Transmission
(2)Indicates Series
(3)0 - Indicates Close Ratio 5 - Indicates Wide Ratio
(4)6 or 7 - Indicates Number of Speed Ranges
(5)Indicates Major Revision
(6)Indicates Power Take Off
(7)T - Indicates Transfer Case R - Indicates Retarder

Manual

EatonĀ® transmission identification plates are located on the right rear side of the housing, near the top cover.

EatonĀ® Model FS ID
Object Number: 200589 Size: SF
(1)Synchronized
(2)x 100 = Nominal Torque Capacity
(3)Design Level
(4)Forward Speeds
(5)Ratio Set

EatonĀ® Model RT ID
Object Number: 200590 Size: SF
(1)Roadranger
(2)Twin Countershaft
(3)x 100 = Nominal Torque Capacity
(4)Multi-Mesh Gearing
(5)Forward Speeds
(6)Ratio Set

Dana/SpicerĀ® ID
Object Number: 200591 Size: SF
(1)Ratio Design B
(2)Forward Speed
(3)Maximum Foot-Pounds of Torque
(4)Easy Shift Synchronized