Transmission Assembly for 2012-2018 Toyota Avalon, Camry

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

• Confirm the 5th digit of your VIN is 'K' (for Camry owners) or confirm your vehicle is equipped with the 3.5L V6 engine (for Avalon owners).
• Locate the manufacturer's certification label on the driver's side door pillar and confirm 'U660E' is listed under the 'A/TM' section.
• Confirm your vehicle is Front-Wheel Drive (FWD/2WD), as this transmission does not have provisions for a transfer case.

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

Special tools this job needs:

• Engine support bar
• Transmission jack
• Toyota Techstream scan tool (or equivalent professional bi-directional scan tool)
• 6mm Allen key
• 24mm socket
• Fluid transfer pump

Budget for these consumables at install:

• Toyota Genuine ATF WS (World Standard) fluid
• Transmission filter (strainer) and pan gasket kit
• Torque converter seal (front pump seal)
• Axle seals
• Cooler-line flush aerosol (e.g., Lubegard Kooler Kleen)

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

What’s involved: Transaxle Compensation Code Registration & TCM Adaptive Relearn

The U660E has a unique 60-digit alphanumeric Transaxle Compensation Code printed on a QR label on top of the case. This code must be programmed into your vehicle's TCM/ECM using a dealer-level scan tool (like Toyota Techstream) to prevent harsh shifts and internal damage. The TCM's learned adaptive values must also be cleared.

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

• Write down or take a clear photo of the 60-digit alphanumeric QR code on top of the transmission case BEFORE installation, as it is completely obscured once installed.
• Ensure the torque converter is fully seated into the front pump (typically three distinct clicks/drops) before bolting the transmission to the engine to avoid cracking the pump gear.
• The fluid level must be set using the overflow plug method while the vehicle is perfectly level and the transmission fluid temperature is strictly between 104°F and 113°F (40°C to 45°C).
• Gently torque the plastic overflow tube inside the drain plug hole to only 7 in-lbs (0.8 N-m) using a 6mm Allen key to avoid stripping it.
• Dropping the subframe requires marking the alignment or using subframe alignment pins to prevent steering pull and suspension binding.

Easy to get right once you know them:

• Mixing up the U660E and U760E: The U760E is for the 2.5L 4-cylinder engine and has a completely different bellhousing bolt pattern.
• Ordering for a Sienna, Highlander, or RX350: These models use different final drive ratios and mounting configurations.
• Failing to record the 60-digit QR code before the transmission is installed in the vehicle.
• Using generic or universal ATF instead of Toyota Genuine ATF WS, which causes immediate shift flares and torque converter shudder.
• Not fully seating the torque converter before tightening the bellhousing bolts, which cracks the pump gear.
• Guessing the fluid level instead of performing the strict temperature-controlled overflow procedure.

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: