Twisted PRO™ 46RH / 47RH Cummins Diesel Transmission

1991–1995 Dodge 5.9L Cummins Diesel

46RH / A518 • 47RH / A618 • 2WD & 4WD

Rated Up To 450 HP / 850 LB-FT

Built for modified 12-valve Cummins trucks, towing and street performance.

PRO CLUTCH PACKAGE

• Raybestos GPZ or equivalent high-energy forward clutches
• Raybestos GPZ or equivalent high-energy direct clutches
• High-energy overdrive clutches
• High-energy overdrive direct clutches
• New performance steels throughout
• Increased direct clutch capacity where drum configuration allows
• Increased overdrive clutch capacity where application allows
• Selective pressure plates used as required
• Clutch packs individually clearanced

FRONT BAND & APPLY

• High-temperature performance front band
• Upgraded front servo
• 3.8–5.0 ratio band apply lever, application dependent
• Billet band strut
• Band anchor inspected and replaced as required
• Drum checked for scoring, heat and taper
• Band apply clearance set during assembly

TRANSGO TFOD-HD2

TransGo TFOD-HD2 Reprogramming Kit

• Higher operating pressure calibration
• Increased clutch and band holding capacity
• Revised pressure curve
• Improved shift timing
• Converter drainback corrections
• TCC pressure improvements on applicable 47RH units
• Servo and accumulator calibration

SONNAX GOVERNOR UPGRADE

Sonnax 12802-01 Primary Governor Valve

• Hardcoat-anodized replacement governor valve
• Longer valve lands for increased bore support
• Improved wear resistance
• Helps maintain consistent hydraulic governor operation

Governor body, weights, springs and feed circuits are cleaned and inspected during assembly.

Additional Sonnax governor and valve-body bore repairs are performed as required by wear.

VALVE BODY

• Complete valve body teardown and cleaning
• Pressure regulator circuit inspected
• Throttle valve and bore inspected
• Governor circuits inspected
• Shift valves inspected
• Accumulator circuit serviced and calibrated
• Overdrive circuit inspected
• 47RH lockup circuit inspected
• Line pressure verified after calibration

OVERDRIVE

• Increased-capacity OD clutch pack where applicable
• High-energy OD frictions
• New OD steels
• OD direct clutch rebuilt
• New OD piston seals
• OD piston and retainer inspected
• OD roller clutch / sprag and races inspected
• OD planetary inspected
• OD sun gear and ring gear inspected
• Intermediate shaft inspected
• OD bearings and bushings replaced as required
• OD clutch clearance set during assembly

46RH and 47RH overdrive geartrain parts remain application-specific.

PUMP

• Pump completely disassembled
• Pump gears and pocket inspected
• Stator support inspected
• New pump bushing
• New pump seal
• Pressure regulator circuit inspected
• Converter charge circuit inspected
• Pump clearances checked and set
• Correct 46RH / 47RH pump configuration retained

LOW / REVERSE

• Heavy-duty low/reverse band
• Reverse drum inspected
• Rear servo rebuilt
• Apply linkage inspected
• Band adjustment set to specification
• 47RH double-wrap reverse band configuration retained where applicable

BEARINGS, BUSHINGS & SEALS

• Complete new bushing kit
• Torrington / roller-bearing upgrades at applicable locations
• New sealing rings
• New lip seals
• New O-rings
• New gaskets
• New front seal
• New manual shaft seal
• New output seal
• New transmission filter
• End play set during assembly

PRO DIESEL TORQUE CONVERTER

Billet-Cover Diesel Converter

• Billet front cover
• Diesel-specific stall calibration
• Furnace-brazed turbine
• Upgraded bearings
• Heavy-duty internal construction

46RH: Correct non-lockup configuration where applicable

47RH: Lockup diesel converter matched to the PRO hydraulic calibration

FINAL BUILD & TEST

• Clutch clearances set
• Band adjustments set
• Pump clearance checked
• End play set
• Clutch circuits air checked
• Governor operation checked
• Cooler circuit checked
• Line pressure verified
• Leak checked before shipping

APPLICATION

46RH / A518 Diesel

1991–1993 Dodge 5.9L Cummins

47RH / A618 Diesel

1994–1995 Dodge Ram 2500 / 3500 5.9L Cummins

2WD & 4WD configurations available