Power Transfer Unit: Description
WARNING: This page is about a different car, the 2006 Dodge Grand Caravan, 2006 Dodge Caravan, and 2006 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
The Power Transfer Unit (P.T.U.) is attached to a modified automatic transaxle case where the right half shaft extension housing would normally be located.
The Power Transfer Unit is sealed from the transaxle and has its own oil sump. The Unit uses Mopar® SAE 80W-90 Gear and Axle Lubricant (MS-9020) and holds 1.15 liters (1.22 quarts).
| 1 - PLUG | 18 - CASE-PTU | 35 - SHIM |
| 2 - WASHER FLAT | 19 - PINION-PTU | 36 - TAPERED ROLLER BEARING |
| 3 - SEAL RING | 20 - O-RING | 37 - SHAFT ASSY. FRONT L.H. |
| 4 - SNAP RING | 21 - SHIM | 38 - SEAL RING |
| 5 - BALL BEARING | 22 - TAPERED ROLLER BEARING | 39 - OIL WIPER |
| 6 - SEAL RING | 23 - COVER-PTU CASE REAR | 40 - RETAINER DIFFERENTIAL BEARING |
| 7 - COVER-PTU CASE END |
24 - FLANGE TUBE-PTU-OUTPUT ASSY. | 41 - SHAFT DIFFERENTIAL PINION |
| 8 - TAPERED ROLLER BEARING | 25 - LOCK NUT-HEX FLANGE | 42 - PIN |
| 9 - SEAL RING | 26 - O- RING | 43 - CASE DIFFERENTIAL |
| 10 - SEAL RING | 27 - RETAINER PLATE | 44 - TAPERED ROLLER BEARING CONE |
| 11 - HEX HEAD SCREW | 28 - O-RING | 45 - SEAL RING |
| 12 - SHAFT-PTU INPUT | 29 - BRACKET | 46 - SEAL RING |
| 13 - GEAR-PTU RING | 30 - THRUST WASHER | 47 - PLUG |
| 14 - TROUGH-PTU (RT.) | 31 - SIDE GEAR-DIFFERENTIAL | 48 - O-RING |
| 15 - TROUGH-PTU (LT.) | 32 - FINAL DRIVE GEAR | 49 - SHIM |
| 16 - TAPERED ROLLER BEARING | 33 - PINION DIFFERENTIAL | 50 - MAGNET |
| 17 - HEX HEAD SCREW | 34 - WASHER DIFFERENTIAL PINION | 51 - DOWEL |
| - | - | 52 - SHAFT ASSY. FRONT R.H. |
| - | - | 53 - HEX HEAD SCREW |
Service of the Power Transfer Unit is limited to:
- Fluid Change
- Seals
- Gaskets
- One ball bearing
- Output flange
If the ring gear and pinion, any tapered roller bearings, case, covers, or pinion carrier fail the entire unit must be replaced.