Shift Fork

Replace the shift fork in the manual transmission by removing the transmission from the vehicle, disassembling the transmission case, replacing the damaged shift fork assembly, and reassembling.

Warnings

Tools required

Parts

• Shift fork assembly (specify 3rd-4th, 5th-6th, or reverse as needed) × 1 — Use OEM specification
• Transmission input shaft seal × 1 — Use OEM specification
• Transmission to engine gasket × 1 — Use OEM specification
• Transfer case to transmission gasket (if equipped) × 1 — Use OEM specification
• Shift rail seals × 1 — Use OEM specification
• Transmission case sealant (RTV) × 1 — Mopar or equivalent anaerobic sealant
• Clutch release bearing × 1 — Replace if worn

Fluids

• ATF+4 — 8 qt
• ATF+4 (transfer case) — 2.5 qt

Preparation

1. Disconnect both battery cables, negative first
2. Raise vehicle on lift or support securely on jack stands rated for vehicle weight
3. Remove skid plates and crossmembers as needed for access
4. Drain transmission fluid completely into appropriate container
5. Drain transfer case fluid if equipped
6. Support engine with support fixture or overhead hoist to prevent tipping when transmission is removed
7. Place transmission jack under transmission and secure with safety chains

Procedure

1. 1

   Remove transfer case
   Disconnect front and rear driveshafts, marking orientation for reinstallation. Remove shift linkage and electrical connections from transfer case. Remove transfer case mounting bolts and carefully separate transfer case from transmission. Set aside on clean work surface.
2. 2

   Disconnect clutch and shift linkage
   Disconnect clutch slave cylinder from bellhousing (leave hydraulic line attached and secure cylinder out of the way). Disconnect shift tower or linkage from transmission. Remove backup light switch connector and any speed sensor connections.
3. 3

   Remove transmission from vehicle
   Remove transmission crossmember mounting bolts. Remove all bellhousing-to-engine bolts (verify exact count and torque sequence per service manual). Carefully slide transmission rearward on jack, ensuring input shaft clears clutch disc and pilot bearing. Lower transmission from vehicle and transport to clean workbench.
4. 4

   Remove shift tower and external components
   With transmission on bench, remove shift tower mounting bolts and lift tower assembly off transmission. Remove any external sensors, switches, and PTO covers if equipped. Clean exterior of transmission case thoroughly before opening.
5. 5

   Split transmission case
   The G56 uses a one-piece case; do not attempt to split case halves. Remove the front bearing retainer/adapter and rear housing, then withdraw the internal geartrain assembly from the case per the service manual, noting position of all internal components.
6. 6

   Remove shift rail assemblies
   Remove shift rail detent plugs, springs, and balls. Carefully pull shift rails from case while noting position and orientation. Remove shift forks from their respective synchronizer sleeves as rails are withdrawn. Inspect shift rail bores for wear or scoring.
7. 7

   Disassemble mainshaft and identify damaged fork
   Remove mainshaft rear bearing retainer. Use snap ring pliers to remove snap rings securing synchronizer assemblies. Remove gears and synchronizers in order, documenting position of each component. Identify which shift fork is damaged and verify the replacement matches exactly.
8. 8

   Install new shift fork
   Install new shift fork onto corresponding synchronizer sleeve, ensuring fork pads engage properly in sleeve groove. Check for smooth operation and proper clearances. Verify fork alignment with shift rail bore.
9. 9

   Reassemble mainshaft assembly
   Reassemble gears, synchronizers, and bearings onto mainshaft in reverse order of disassembly. Install all snap rings ensuring they seat fully in grooves. Check endplay of each gear assembly with dial indicator if available (should be minimal). Install mainshaft bearing retainer.
10. 10

    Install shift rails and forks
    Apply light coat of manual transmission fluid (75W-85 GL-4 / Synchromesh) to shift rails. Install shift forks into their synchronizer sleeves. Carefully insert shift rails through case bores and fork bores, ensuring forks engage properly. Install detent balls, springs, and plugs. Verify all rails move smoothly through full range of motion.
11. 11

    Reassemble transmission case
    Apply appropriate sealant to case mating surfaces per service manual specifications. Carefully align and join case halves, ensuring all shafts and rails align properly. Install case bolts and tighten in crisscross pattern gradually to avoid warping case.
12. 12

    Install external components
    Install new input shaft seal using seal driver. Reinstall shift tower with new gasket or sealant. Install all sensors, switches, and external covers. Verify shift tower operates smoothly through all gear positions.
13. 13

    Reinstall transmission in vehicle
    Apply a light film of high-temperature grease to input shaft splines only (do not grease a hydraulic concentric slave bearing if equipped). Position transmission on jack and carefully guide input shaft through clutch disc using clutch alignment tool as reference. Align transmission with engine and install all bellhousing bolts. Reconnect clutch slave cylinder.
14. 14

    Reinstall transfer case and drivelines
    Install new gasket between transmission and transfer case. Mount transfer case to transmission and install mounting bolts. Reconnect shift linkage and electrical connections. Reinstall front and rear driveshafts in original orientation. Install crossmember and mounting hardware.
15. 15

    Fill fluids and final checks
    Fill transmission with approximately 4 quarts of Mopar manual transmission fluid (75W-85 GL-4 or equivalent Synchromesh) through fill plug to the bottom of the fill hole. Fill transfer case with approximately 2.0 quarts of ATF+4 (verify capacity per service manual). Reconnect all shift linkage and adjust as needed. Reconnect battery cables. Install skid plates and lower vehicle.

Reassembly

1. Ensure all case bolts are tightened in proper sequence to avoid case warping
2. Verify shift tower moves smoothly through all gear positions before final installation
3. Double-check that all snap rings are fully seated in their grooves
4. Apply thread locker to case bolts as specified in service manual
5. Ensure driveshafts are installed in original orientation to maintain balance

Verification

• With engine running and clutch pedal depressed, verify transmission shifts smoothly through all gears
• Test drive vehicle through all gears under light load to verify proper shift fork operation
• Check for any fluid leaks around case joints, shift tower, and input shaft seal
• Verify no abnormal noises such as grinding or popping during shifts
• Confirm proper clutch engagement and disengagement with no slippage
• Recheck fluid levels after test drive and top off if necessary

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