Transmission Assembly for 2013 Chevrolet & GMC • Equinox, Terrain

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

• Verify the 8th digit of the VIN is 'K' or 'C' to confirm the 2.4L 4-cylinder engine.
• Verify the glove box RPO sticker contains code 'MHC' (AWD 6T45).
• Verify the vehicle is physically All-Wheel Drive (has a center driveshaft and rear differential).
• Verify the barcode sticker on the transmission case displays code '3KEW' or '3MDW'.

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

Special tools this job needs:

• Engine support fixture/bar
• Transmission jack
• Subframe alignment pins
• GM MDI / MDI2 scan tool with active GM SPS2 subscription

Budget for these consumables at install:

• DEXRON-VI Full Synthetic ATF
• Torque converter input shaft seal (sources differ on part number: GM Part #24266675 vs #24256953 — confirm with us before install)
• Left and right CV axle output seals
• Transfer case (PTU) seal
• High-pressure chemical cooler-line flush
• Transmission filter and pan gasket kit

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

What’s involved: VIN-Specific Programming, Solenoid Characterization, and TCM Adaptive Relearn (Fast Learn)

The internal TEHCM must be flashed with the vehicle's VIN using GM's Techline Connect / SPS2 software via a J2534 pass-thru or GM MDI tool. The unique 30-digit Solenoid Characterization Code must be entered, followed by a mandatory 'Fast Learn' adaptive reset to calibrate shift pressures.

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

• Torque Converter Seating: Must spin and push the converter until it drops backward three distinct times to fully engage the pump. Failing to do so will crack the fluid pump upon bolting the transmission to the engine.
• No Dipstick Fluid Fill: Fluid level must be checked via the oil level check plug on the side of the case with the engine running, vehicle level, and fluid temperature between 185°F and 203°F.
• Subframe Alignment: Must use subframe alignment pins during reassembly to prevent throwing off steering geometry.
• Transfer Case Spline Lubrication: Apply high-temperature, water-resistant splining grease to the PTU splines to prevent rust and stripping.
• Gen 1 vs Gen 2 Components: Internal components like the valve body, TCM, and solenoids do not interchange between Gen 1 (pre-2012) and Gen 2 (2012+) units.

Easy to get right once you know them:

• Buying a FWD transmission for an AWD vehicle due to visual similarities.
• Reusing the old contaminated TEHCM to avoid programming, which introduces metal debris into the replacement unit.
• Skipping the mandatory adaptive 'Fast Learn' relearn, causing harsh shifts and rapid clutch destruction.
• Checking the fluid level with the engine off, leading to severe underfilling.
• Misdiagnosing the original problem when the issue was actually an external sensor, wiring, or ground fault.

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: