Front Differential

This procedure covers removal and replacement of the front differential assembly on a 4WD Dodge Ram 2500 with 5.9L Cummins diesel engine, including draining fluid, disconnecting axle shafts and driveshaft, and differential removal.

Warnings

Tools required

Parts

• Front differential assembly (if replacing complete unit) × 1 — Verify gear ratio matches door sticker
• Differential cover gasket × 1 — Use OEM specification or RTV
• Axle shaft cotter pins × 2 — Use OEM specification
• Differential fill plug seal washer × 1 — Copper or aluminum crush washer
• Drain plug seal washer × 1 — Copper or aluminum crush washer

Fluids

• 75W-90 synthetic gear oil — 3.5 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Chock rear wheels securely
3. Raise front of vehicle and support on jack stands under frame rails behind front suspension
4. Remove both front wheels
5. Spray all differential mounting bolts, CV joint bolts, and driveshaft bolts with penetrating oil
6. Allow vehicle to cool if recently driven to prevent burns from hot gear oil

Procedure

1. 1

   Drain front differential fluid
   Place drain pan under front differential. Remove the drain plug from the bottom of the differential housing and allow all gear oil to drain completely. Once drained, reinstall drain plug with new crush washer but do not fully tighten yet.
2. 2

   Remove axle shaft nuts
   At each front wheel hub, remove the hub/bearing retaining hardware per the Dana 60 procedure. The front wheel bearings are adjusted for preload rather than torqued to a fixed high value; consult the FSM for the correct bearing adjustment procedure and locknut torque. Discard and replace any single-use retaining hardware.
   ⚠Axle nuts are extremely tight. Ensure vehicle is stable and use proper leverage to avoid injury.
   Torque spec

   Axle Nut250 Nm (184 lb-ft)
3. 3

   Disconnect CV axle shafts from differential
   This vehicle uses a solid Dana 60 front axle, not independent CV axle shafts. To remove the differential (carrier), the front axle shafts must be pulled from the axle tubes: remove the hub/spindle assemblies or unbolt the inner axle shaft as required, then withdraw the axle shafts far enough to clear the differential carrier. Support removed components to prevent damage.
   ℹ️Mark CV joint orientation before removal to prevent driveline vibration on reassembly.
   Torque spec

   CV Joint Bolts61 Nm (45 lb-ft)
4. 4

   Disconnect front driveshaft
   Mark the relationship between the front driveshaft and the differential input flange. Remove the U-joint strap bolts or flange bolts securing the driveshaft to the front differential pinion yoke. Support the driveshaft and lower it away from the differential, securing it to the frame or crossmember with wire to prevent it from hanging.
   ℹ️Marking driveshaft orientation is critical to prevent driveline vibration and u-joint wear.
   Torque spec

   Driveshaft U-Joint Straps20 Nm (15 lb-ft)
5. 5

   Disconnect vent hose and brake line brackets
   Locate the differential vent hose on top of the housing and disconnect it from the fitting. Remove any brake line brackets or ABS sensor wiring that may be attached to the differential housing. Take note of routing for reinstallation.
6. 6

   Support differential with transmission jack
   Position a transmission jack or heavy-duty floor jack under the center of the differential housing. Raise it slightly to take the weight off the mounting bolts. Ensure the differential is securely supported and stable on the jack before proceeding.
   ⚠️Differential must be properly secured to jack before removing mounting bolts. Use safety chains or straps if available.
7. 7

   Remove differential mounting bolts
   To service the front differential (carrier), remove the differential cover to access the carrier, or unbolt and remove the complete front axle assembly if replacing the housing. The Dana 60 carrier is retained by bearing caps inside the housing, not by external mounting bolts to axle tubes; follow the FSM for carrier removal and ring/pinion setup.
   ⚠Differential will become unstable as final bolts are removed. Maintain control of the jack and have an assistant help guide it.
8. 8

   Remove differential from vehicle
   Carefully lower the differential assembly on the transmission jack and maneuver it out from under the vehicle. Be aware of any remaining connections or obstructions. Once clear, remove from jack and place on a sturdy workbench for inspection or rebuild.
9. 9

   Inspect and prepare replacement differential
   If installing a replacement differential, verify the gear ratio matches the original (check door sticker or rear differential tag). Clean all mounting surfaces thoroughly with a wire brush. Inspect axle tube mounting surfaces for damage or corrosion. Apply a thin coat of RTV silicone to mounting surfaces if gaskets are not used.
10. 10

    Install differential assembly
    Position the differential on the transmission jack and raise it into position under the vehicle. Align the differential with the axle tube mounting points and slowly raise while guiding into place. Start all mounting bolts by hand before tightening any. Torque mounting bolts to specification in a crossing pattern.
11. 11

    Reconnect front driveshaft
    Align the marks made during disassembly and position the front driveshaft to the differential pinion yoke. Install U-joint strap bolts or flange bolts and tighten evenly in a crossing pattern to the specified torque. Verify all bolts are secure.
    ℹ️Driveshaft must be aligned to original marks to prevent vibration.
    Torque spec

    Driveshaft U-Joint Straps20 Nm (15 lb-ft)
12. 12

    Reconnect CV axle shafts
    Align the CV joint flanges with the marks made during disassembly. Install all CV joint bolts and torque to specification. Repeat for both sides. Ensure flanges are properly seated before tightening bolts.
    Torque spec

    CV Joint Bolts61 Nm (45 lb-ft)
13. 13

    Install axle shaft nuts
    Clean the hub and spindle components. Adjust the front wheel bearing preload per the Dana 60 FSM procedure (typically snug the adjusting nut while rotating the hub, then back off and set to the specified preload). Install the locking hardware and new cotter pin/retainer as applicable. Verify the hub rotates freely with correct preload.
    ⚠Axle nuts must be properly secured with new cotter pins or staking. Do not reuse old cotter pins.
    Torque spec

    Axle Nut250 Nm (184 lb-ft)
14. 14

    Fill differential with gear oil
    Tighten the drain plug with new crush washer to specification. Remove the fill plug from the side of the differential housing. Using a gear oil pump, fill the differential with approximately 3.0 quarts of 75W-90 gear oil, or until oil is level with the bottom of the fill hole. Verify capacity against the Dana 60 specification in the FSM. Install fill plug with new crush washer. Reconnect differential vent hose.
15. 15

    Reinstall wheels and lower vehicle
    Reinstall both front wheels and torque lug nuts to specification in a star pattern. Remove jack stands and carefully lower the vehicle to the ground. Perform a final torque check on lug nuts with wheels on the ground.
    Torque spec

    Wheel Lug Nuts183 Nm (135 lb-ft)

Reassembly

1. Ensure all alignment marks on driveshaft and CV joints are properly matched to original positions
2. Use new cotter pins or properly stake axle nuts - never reuse old hardware
3. Apply thread locker to mounting bolts if specified by manufacturer
4. Verify all brake line brackets and ABS sensors are properly secured and routed
5. Double-check all torque specifications after vehicle is lowered

Verification

• Check for gear oil leaks around differential cover, drain plug, and fill plug after installation
• Start vehicle and shift transfer case through all ranges to verify proper engagement
• Test drive vehicle at low speed and verify no abnormal noises from differential
• Check for vibration during test drive - improper driveshaft or CV joint alignment will cause vibration
• Recheck differential fluid level after test drive and top off if necessary
• Inspect all mounting bolts and axle nuts for proper torque after 50-100 miles of driving

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