Master overhaul kit for the Toyota U660E/U660F 6-speed with frictions, steels and seals for Highlander, Avalon, Camry V6 and Lexus ES350 from 2006 on.
When a Toyota or Lexus V6 six-speed starts slipping, flaring between gears or leaves clutch material in the pan, the fix is a teardown, and this is the kit that goes back in. It is a master rebuild kit for the Aisin U660E (front-wheel drive) and U660F (all-wheel drive), manufacturer part DEE-U660F, and it includes the friction plates and steel plates along with the overhaul gasket and seal set and sealing rings. It is the kit for shops and serious DIY rebuilders doing a complete overhaul on a V6 Camry, Avalon, Venza or Lexus ES350, not a pan-drop repair.
The U660E uses multiple clutch and brake packs to build its six ratios, and the TCM controls each apply with linear solenoids that modulate pressure rather than switching hard. As the frictions wear, the TCM keeps adding pressure and adjusting timing to hold the shift quality it expects; when the packs are too far gone, that compensation runs out and you feel flare, slip or harsh engagement. A master kit renews every one of those packs at once and reseals the whole unit, so the clutches you did not inspect closely are not left as the next failure. Because the U660E is behind Toyota's torquey 3.5L V6 with a low first gear, heat and load on the packs are significant, which is why worn-out units tend to come in with several packs burned at once.
Rule out the cheap causes first. Check fluid type and level using the hot overflow procedure in our U660E fluid type and capacity guide, because low or incorrect fluid alone produces flare and harsh shifts. Scan every module and repair engine faults; a dirty throttle body or slow MAF sensor causes harsh coasting downshifts on these vehicles without any transmission code. If the problem is a 25-50 mph shudder with clean fluid, the cause is more likely the converter or the lockup valves in the valve body than worn clutches, so read the U660E and U760E problems and service guide before committing to a rebuild. Gears Magazine (ATRA) also notes that the U660E case can wear where the main bearing support mounts, so inspect that bearing race closely once the unit is apart; if the outer race moves at all, the case needs repair or replacement.
The kit is listed for U660E and U660F transmissions from 2006 on. The U660E launched in the 2007 Lexus ES350 and Camry V6, then appeared in the 2008 Avalon and 2009 Venza, always behind the V6. The listing also names the Highlander; earlier V6 Highlanders used a five-speed, so confirm the transmission ID tag reads U660E or U660F before ordering. Four-cylinder Camry, RAV4, Highlander and Venza models use the U760E and need a different kit, such as our U760E master rebuild kit. Clutch counts and some seals changed over the production run, so compare plate counts as you disassemble, or send us your year, model and engine size. Every U660E part we stock is on the U660E collection page.
Replace the one-way clutch while you are in there if it shows any wear; our U660E sprag clutch is sold separately.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Friction plates, steel plates, the overhaul gasket and seal set, and the sealing rings for a full U660E or U660F overhaul. Hard parts such as drums, bushings, the sprag and the valve body are not included.
Yes. The kit is listed for both the U660E front-wheel-drive and the U660F all-wheel-drive versions of the six-speed.
No. Four-cylinder models use the U760E, which needs its own kit. Check the transmission ID tag before ordering.
ATSG lists about 6.57 liters, or 6.94 US quarts, total including the differential. Use Toyota WS and set the final level hot through the overflow plug.
Yes. Clear adaptive values with a scan tool that supports Toyota's ECT reset. Disconnecting the battery does not clear them because the TCM memory is non-volatile.
Probably not yet. A light-throttle shudder with clean fluid usually points to the converter or the lockup valves in the valve body, not worn clutches.
