U660F Master Rebuild Kit 2006-2011, new and ready to install. Fits the U660F. Ships fast from the USA.
The first U660 six-speeds were built in 2006, so an all-wheel-drive Toyota or Lexus V6 from that first run has usually covered a lot of miles by now. When one of these early U660F units starts flaring on the 2-3 or 3-4 shift, slips once it is hot, or drops dark fluid full of friction dust, the clutches are finished and the transaxle needs a full overhaul. This master rebuild kit is listed for the U660F from 2006 through 2011 and cross-referenced to the U660E, the front-wheel-drive version of the same gearbox.
The U660 makes six forward gears with just two rotating clutches, three brakes and one sprag, per ATSG's component chart. With that few elements, every pack is applied in several gears, so one tired pack shows up as a slip in more than one range. The TCM hides early wear by raising apply pressure through its linear solenoids; by the time a first-generation unit slips noticeably it has usually been compensating for years and more than one pack is worn. A master kit renews the frictions and steels and supplies the gaskets and seals to reseal the whole case in one job, so you are not tearing the unit down twice.
ATSG's model application list for this transmission runs from 2006 to 2011 across the Camry, Avalon, Highlander, RAV4, Sienna, Venza and Lexus ES350 and RX350, which is the same production window this kit is listed for. The AWD units in that group add rear-driveline drag on top of a strong V6 and a low first gear, so expect heat damage in several packs rather than one.
Older units are the ones most likely to have had the wrong fluid or a cold-checked level at some point. Correct both first: Toyota sets the level hot through an overflow plug, and our U660E fluid type and capacity guide covers the temperature window. Then sort shudder from slip. A buzz between 25 and 50 mph that goes away in Manual 3rd is the converter clutch or lockup valve, not worn plates, and the U660E and U760E problems guide explains that test plus the harsh coast-downshift check that turns out to be throttle-body carbon. If the fluid is correct and the slip is still there, the rebuild is justified.
Listed for the U660F, 2006-2011, with the U660E as its reference. Read the tag on the transmission case and confirm U660F before ordering, and do not confuse it with the four-cylinder U760F, which is a different unit. Plate counts and some seals were revised during the run, so count what comes out of each pack. If you are unsure, send your year, model and VIN and we will check it. Every U660-family part we carry is on the U660E and U660F collection page; a single-year 2006 U660F master rebuild kit is also listed.
| Fits | U660F 2006-2011 |
| Part type | Master Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Reference | U660E |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for U660F transmissions from 2006 through 2011. Not every AWD V6 from those years used the U660F, so confirm the tag on your case reads U660F, or send us your VIN and we will check it before you order.
This kit is cross-referenced to the U660E, so the internal soft parts are shared. The F is the all-wheel-drive version; parts outside the main transaxle, such as the transfer seals, are not part of this kit.
Check drums and the clutch module for wear, have the valve body serviced, and inspect the case bearing bore. A shift kit and fresh Toyota WS fluid are normally done at the same time.
Probably not yet. Shudder between 25 and 50 mph that disappears in Manual 3rd points at the torque converter clutch, lockup valves or wrong fluid, not worn clutches. Fix the fluid and test before committing to a rebuild.
There is no dipstick. Fill with Toyota Genuine ATF WS and set the level through the overflow plug with the fluid at 185-194 F, as Toyota's level-adjustment bulletin describes.
