For 1990-2009 cars

The medium duty C model vehicle uses many different manual transmissions. Because of the many different manual transmissions, only a brief description follows. For further explanation of the description and operation of a certain Eaton Fuller manual transmission refer to the Eaton Fuller website http://truck.eaton.com/na/service_products/. Or contact Eaton Fuller transmission for the transmission service manual. Transmission Technologies Corporation now supports the Spicer transmission service manual information. For Spicer transmission service manuals, refer to TTC website www.ttcautomotive.com. For correct identification of the transmission, refer to the identification tag located on the transmission. Refer to Transmission ID and VIN Derivative Location in General Information. It is important to use the proper service manual and to order the correct parts for the specific transmission. Some models have different gear ratios and other internal components to meet the customer requirements. The transmission RPO will determine the correct components.

### RPO MSC Eaton Fuller Model FS4205B

The FS4205B is a five-speed transmission. The five forward gears are synchronized. The 1st gear is a 6.99 ratio and the 4th gear is an 1.28 ratio. The transmission is used with engines up to 569 N·m (420 lb ft) torque.

### RPO MSG Eaton Fuller Model FS4205A

The FS4205A is a five-speed transmission. The five forward gears are synchronized. The 1st gear is an 8.05 ratio and the 5th gear is a direct drive ratio. The transmission is used with engines up to 569 N·m (420 lb ft) torque.

### RPO MNC Eaton Fuller Model FS5205

The FS5205A is a five-speed transmission. The five forward gears are synchronized. The 1st gear is a 6.82 ratio, the 4th gear is a 1.28 ratio and the 5th gear is direct drive. The transmission is used with engines up to 705 N·m (520 lb ft) torque.

### RPO MPU Eaton Fuller Model FS5205A

The FS5205A is a five-speed transmission. The five forward gears are synchronized. The 1st gear is a 7.52 ratio and the 4th gear is 1.52 ratio. The transmission is used with engines up to 705 N·m (520 lb ft) torque.

### RPO MK0 Eaton Fuller Model FS6305A

The FS6305A is a five-speed transmission. The five forward gears are synchronized. The 1st gear is a 7.22 ratio and 4th gear is a 1.39 ratio. The transmission is used with engines up to 854 N·m (630 lb ft) torque.

### RPO ML0 Eaton Fuller Model FS6105B

The FS6105B is a five-speed transmission. The five forward gears are synchronized. The 1st gear is a 7.22 ratio and 4th gear is a 1.27 ratio. The transmission is used with engines up to 827 N·m (610 lb ft) torque.

### RPO MM7 Eaton Fuller Model FS5406A

The FS5406A is a six-speed transmission. The six forward gears are synchronized. The transmission is used with engines up to 759 N·m (560 lb ft) torque.

### RPO MM8 Eaton Fuller Model FS6406A

The FS6406A is a six-speed transmission. The six forward gears are synchronized. The transmission is used with engines up to 895 N·m (660 lb ft) torque.

### RPO M69 Eaton Fuller Model FSO8406

The FSO8406 is a six-speed transmission. The six forward gears are synchronized. Sixth gear is an overdrive gear with a 0.78 ratio. The transmission is used with engines to 1 139 N·m (840 lb ft) torque.

### RPO MR3 Eaton Fuller Model FO8406A-ASX

The FSO8406A-ASX is a six-speed transmission. The six forward gears are synchronized. An automatic electronic shifter shifts the transmission. Sixth gear is an overdrive gear with a 0.78 ratio. The transmission is used with engines to 1 139 N·m (840 lb ft) torque.

### RPO MUT Eaton Fuller Model RT6609

The RT6609 is a nine-speed transmission. The transmission uses multi-mesh gearing and is not synchronized. Because the transmission is not synchronized, it requires a clutch system that utilizes a clutch brake. The transmission uses an auxiliary section to achieve a low range and a high range. The air control shifter shifts the auxiliary section. The range selection in the auxiliary section is synchronized. The transmission is used with engines up to 895 N·m (660 lb ft) torque.

### RPO MS9 Eaton Fuller Model RT8709

The RT8709 is a nine-speed transmission. The transmission uses multi-mesh gearing and is not synchronized. Because the transmission is not synchronized it requires a clutch system that utilizes a clutch brake. The transmission uses an auxiliary section to achieve a low range and a high range. The air control shifter shifts the auxiliary section. The range selection in the auxiliary section is synchronized. The transmission is used with engines up to 1 180 N·m (870 lb ft) torque.

### RPO MT3 Eaton Fuller Model RT8908LL

The RT8908LL is an eight-speed transmission with 2 addition deep reduction ratios in low and reverse. The transmission uses multi-mesh gearing and is not synchronized. Because the transmission is not synchronized, it requires a clutch system that utilizes a clutch brake. The transmission uses an auxiliary section to achieve a low range and a high range. The air control shifter shifts the auxiliary section. The range selection in the auxiliary section is synchronized. The transmission is used with engines to 1 139 N·m (840 lb ft) torque.

### RPO MK8 Spicer Model ES52-7B

The ES52-7B is a seven-speed transmission. The seven forward gears are synchronized. The transmission is used with engines to 705 N·m (520 lb ft) torque.

### RPO MK9 Spicer Model ESO66-7B

The ESO66-7B is a seven-speed transmission. The seven forward gears are synchronized. The seventh gear is an overdrive ratio. The transmission is used with engines to 895 N·m (660 lb ft) torque.