Automatic Transmission Assembly for 2015 Jeep Grand Cherokee

A quick look at your own vehicle makes sure the right transmission shows up:

• Verify drivetrain is 4x2 (RWD) only: confirm there is no front driveshaft, front differential, or transfer case.
• Verify engine is 3.6L Pentastar V6: check emissions label or confirm the 8th digit of the VIN is 'G'.
• Locate and match the transmission ID stamp on the driver's side machined pad.

What the install really takes — plan and budget with confidence:

Special tools this job needs:

• Professional diagnostic scan tool (wiTECH or J2534 pass-thru)
• Infrared thermometer or scan tool for fluid temp
• Fluid transfer pump
• Pass-thru connector sleeve tool (Mopar P/N 10377A)
• Torpedo or magnetic level
• Transmission jack
• Torque wrenches

Budget for these consumables at install:

• Mopar ZF 8&9 Speed ATF (P/N 68218925AA) or ZF Lifeguard 8 fluid
• Replacement plastic transmission pan assembly with integrated filter and gasket
• Torque-converter input shaft seal
• Electrical pass-thru connector sleeve with fresh O-rings
• Professional thermal cooler-line flush

What your vehicle’s computers will need after the swap:

What’s involved: VIN-specific programming/flashing and TCM adaptive relearn (Quick Learn)

The TCM is integrated into the valve body. A used unit will have a VIN mismatch causing communication faults or limp-in mode. It must be flashed with the correct software calibration matching the vehicle's VIN using a dealer-level tool (wiTECH or equivalent J2534 pass-thru), followed by a 'Quick Learn' adaptation reset.

Pro tips for a smooth first start-up — hand them to whoever does the install:

• Torque Converter Seating: Must click/drop three distinct times during rotation. Failure to seat fully will crack the internal oil pump upon bolting to the engine.
• Level Pan Fluid Check: No dipstick. Vehicle must be perfectly level, engine running, and fluid temperature strictly between 30C and 50C (86F to 122F) when checking the side fill plug.
• Cooler Bypass Valve: Transmission must be warmed up sufficiently to open the thermal bypass valve and purge air from the cooling loop during fluid level check.
• Pass-Thru Connector Sleeve: Never use pliers to pull the sleeve; use release tool Mopar P/N 10377A to avoid cracking the plastic housing.
• Plastic Pan Torque: Pan bolts must be torqued to a strict sequence and low value of 10 Nm (89 in-lbs) to prevent warping and leaks.

Easy to get right once you know them:

• Ordering a 4x2 transmission for a 4x4 vehicle, assuming the tailhousing can be easily swapped (requires total internal teardown).
• Mixing up V6 (845RE) and V8 (8HP70) transmissions, which have completely different bellhousing bolt patterns.
• Using cheap, generic, or incorrect fluid (like ATF+4) instead of the required Mopar ZF 8/9 Speed fluid.
• Skipping the TCM programming/VIN flashing step, leading to calibration mismatch codes and limp-in mode.
• Over-tightening the plastic transmission pan bolts, causing warping and immediate leaks.
• Failing to fully seat the torque converter, resulting in a broken front pump gear upon installation.
• Skipping the mandatory transmission cooler line flush, introducing old debris into the replacement unit.

Not issues with the units on this page — the manufacturer documented these for every transmission of this family, wherever you buy one. Handy for your installer: