U660E Shift Kit 2006-2018

A V6 Camry, Avalon, Venza, Highlander, Sienna, RAV4 or Lexus ES350 or RX350 that shuttles between 2nd and 3rd, lets the revs climb under throttle in 3rd or 4th, or sets torque converter clutch slip codes is showing the classic signs of a worn U660E valve body. This is the TransGo SK U660E SHIFT KIT valve body repair kit for 2006-2018 U660E and U660F six-speed transaxles, sold under Transtar number T47165. It replaces the three valves in that unit's valve body that wear first, using the bores you already have.

What the SK U660E does in a U660E

Toyota runs line pressure, lockup and clutch apply on the U660E through pulse-width-modulated solenoids. Constant valve movement against aluminum eventually wears the bores, and Gears Magazine names the solenoid modulator and the lockup control boost valves among the parts that must always be checked on these units. TransGo builds this kit around three of those wear points:

• TCC boost valve and bushing in the accumulator body. When they leak, the computer loses accurate control of lockup apply and release, which is where the TCC codes come from.
• Solenoid regulator (modulator) valve in the mid body. It caps the oil fed to the solenoids no matter what main line is doing. A worn bore lets that feed run high or low, and line pressure and shift feel follow it. The kit supplies a new bushing, valve, orange spring and outer sleeve that restore the circuit inside the worn bore with no reaming.
• B2 regulator outer valve with a new white spring. The hardened replacement rides on an unworn part of the bore, which is the fix for the 2-3 flare.

The box also includes a 0.055 in. drill bit used to enlarge one hole in the main separator plate and one in the lower body plate. TransGo labels those plate updates as cooling steps.

Symptoms this kit addresses

• Shuttle shift or flare on the 2-3 upshift
• Slipping with throttle applied in 3rd and/or 4th gear
• TCC slip or performance codes, often with a 25-50 mph shudder under light throttle
• Shift-quality complaints with line pressure reading high or low

How to confirm before buying

Rule out the cheap causes first. Gears Magazine reports that wrong or worn fluid alone can produce converter shudder, harsh or flaring shifts and solenoid codes in these units, so set the level with Toyota WS at 185-194 F using the check-plug method. To separate engine roughness from converter shudder, drive in Manual 3rd, which disables flex lockup. On the U660E only, the transmission computer bolts to the case and plugs into the solenoid connector; it can fail on its own and is plug-and-play for testing. If the complaints survive those checks, a vacuum test of the valve body or a teardown confirms bore wear. The full sequence is in our U660E and U760E problems and service guide, and fluid specs are in the U660E fluid type and capacity guide.

Fitment

TransGo lists this kit for 2006-2018 Toyota and Lexus vehicles with the U660E or U660F; the source listing adds Lotus, whose V6 cars used the same transaxle. Gears Magazine dates the U660E's first use to the 2007 ES350 and Camry, so a 2006 vehicle should be checked by its ID tag. This kit does not fit the four-cylinder U760E; TransGo's own instructions say so, and that unit takes the separate SK U760E kit. If you are unsure which transaxle you have, read the code on the case tag or send us your year and VIN. Other U660E kit listings, including the 2007 U660E shift kit, plus every U660E and U760E part are on our U660E and U760E parts page.

Install notes

• Mark every check ball, filter and retainer location before you lift the plates. TransGo shows a typical layout, but tells you to put parts back where you found them if yours differ.
• Every retainer must sit below the valve body surface once installed; grind the TCC boost retainer if it stands proud. The new boost valve goes into its bushing stepped end first.
• Drill the two separator plate holes with the supplied 0.055 in. bit; do not skip this step.
• If the planetary has failed, the valve body must be fully stripped and cleaned. If clutches are already burnt, pair the kit with a U660E master rebuild kit. When the bores are too far gone, a replacement U660E valve body may cost less in labor.
• Refill with genuine Toyota WS fluid. Reset adaptive values with a scan tool that can run the ECT reset; Gears warns that crossing battery cables can damage the modules and does not clear this memory.

Will this kit fit a four-cylinder Camry or Highlander with the U760E?

No. TransGo states SK U660E does not fit U760E models. The four-cylinder U760E and U760F use SK U760E, which we sell separately.

Does it fit the all-wheel-drive U660F?

Yes. TransGo lists the kit for both the U660E and the U660F from 2006 to 2018.

Do I have to ream the valve body?

No. The solenoid modulator repair uses a supplied bushing that works in the existing worn bore, and the B2 valve uses an unworn area of its bore. The only machining is drilling two separator plate holes with the included 0.055 in. bit.

Will it fix converter shudder at 25-50 mph?

It can when the cause is a worn TCC boost valve and bushing. Shudder can also come from wrong fluid, the converter itself or programming, so service the fluid with Toyota WS and isolate it in Manual 3rd first.

How do I reset the transmission after installing it?

Clear codes in all modules, then run Toyota's ECT reset memory function with a capable scan tool or Techstream. Disconnecting the battery does not clear the adaptive memory on these units.

• Toyota/Aisin U660E and U760E: Shudder, Valve Body Wear, and the WS Fluid-Level Procedure
• U660E Fluid Type, Capacity and Service Interval