CVT Transmission Assembly with Transfer Case for 2017-2023 Subaru Impreza

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

• Confirm transmission code TR580GDJAB on the B-pillar ID plate or bellhousing tag.
• Verify the vehicle has a 2.0L naturally aspirated 4-cylinder engine.
• Confirm the vehicle is an AWD model with an automatic CVT, not a 5-speed manual.

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

Special tools this job needs:

• Engine support bar or hoist
• Heavy-duty transmission jack
• Fluid transfer pump
• OBD2 Scan Tool with bi-directional capabilities

Budget for these consumables at install:

• Genuine Subaru CVTF-II (Green) fluid (Part #SOA427V1660) or Subaru CVT Fluid Lineartronic II (SOA748V0200) - 8.0 to 13.0 quarts for dry fill
• Front Differential Fluid: 75W-90 GL-5 Gear Oil - 1.2 to 1.4 quarts
• Torque converter hub O-ring and input shaft seal
• New drain plug crush washers (Part #803916010)
• Transmission Pan Gasket
• Axle Seals
• Aerosol cooler-line flush (e.g., Lubegard Kooler Kleen)

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

What’s involved: TCM Adaptive Relearn (AT Learning Mode)

TCM adaptive relearn is mandatory immediately after installation to calibrate the control module to the specific tolerances and hydraulic pressures of the replacement unit. Skipping this will cause harsh shifting, slipping, and permanent transmission damage. Can be performed with Subaru Select Monitor SSM4 or high-end professional bi-directional scan tools (Autel, Launch, OTOFIX).

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

• The 'Two Chambers' Trap: The CVT and front differential share the same case but are completely separate chambers with different fluids. Draining the front diff and overfilling the CVT (or vice versa) will instantly destroy both.
• Torque Converter Seating: Ensure the torque converter is fully seated onto the input shaft and oil pump splines (must click inward three distinct times). Forcing the bellhousing bolts tight on an unseated converter will crack the internal oil pump gear.
• Fluid Leveling Temperature Window: Fluid level must be checked with the vehicle level, engine idling, and transmission fluid temperature strictly between 95°F and 113°F (35°C to 45°C) via the side fill hole.
• Cooler Line Flush: Debris from the previous failed unit must be completely flushed out of the cooler lines to prevent immediate contamination and failure of the replacement unit.

Easy to get right once you know them:

• Using Aftermarket 'Universal' CVT Fluid: The TR580 requires Genuine Subaru CVTF-II. Universal fluids cause chain slippage and ruin the transmission.
• Mixing Up the Fill and Drain Plugs: Accidentally pumping gear oil into the CVT chamber or CVT fluid into the front differential.
• Skipping the TCM Relearn: Assuming the transmission is plug-and-play, leading to erratic shifting and premature clutch wear.
• Incorrect Fluid Level Check: Checking fluid level without monitoring the specific temperature window using a scan tool.

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: