U660E Banner Rebuild Kit 2007-11, new and ready to install. Fits the U660E. Ships fast from the USA.
This kit is for the 2007-2011 Lexus ES350 or RX350 with the 3.5L V6 whose U660E six-speed has started slipping, flaring between gears or engaging late, and has reached the point of coming out of the car. It is a banner-style kit: the transmission overhaul set of seals and gaskets with Viton sealing, a standard set of new friction plates, and new late-design pistons for the C2 clutch. The pistons are what set this version apart from our lower-priced banner kit, and they matter when the original bonded pistons have hardened or been cooked by overheated fluid.
Gears Magazine notes the U660E first appeared in the 2007 ES350 and Camry and is used behind Toyota's V6 engines. Each of its six ratios comes from applying clutches and brakes, labeled C1, C2, B1 and so on in Toyota's service information, against the planetary gear sets. Every clutch has a piston that is pushed by fluid pressure to squeeze the friction plates. When the piston's rubber lip hardens or tears, pressure leaks past it and the clutch slips even with good plates. A banner kit replaces the sealing and the friction material; the version with pistons also replaces the C2 apply pistons with the later design, so that circuit is not depending on a used part.
Rule out the cheaper causes first. Gears Magazine reports that harsh coasting downshifts with no codes often trace to a dirty throttle body or slow mass airflow sensor, not the transmission, and that a 25-50 mph shudder is most often torque converter flex lockup, which you can isolate by driving in Manual 3. Check the level hot at the overflow plug and look at the fluid, then use our U660E and U760E problem guide for the full sequence. If the unit slips on a correct fill and the pan shows clutch debris, it needs to come apart.
This kit is listed for the U660E in the 2007-2011 Lexus ES350 3.5L and 2007-2011 Lexus RX350 3.5L. RX350 owners in particular should read the transmission plate before ordering: all-wheel-drive models carry the U660F, and Toyota used more than one transaxle in the RX350 over those years. Match the plate to U660E, or send us your year, model and VIN and we will confirm. The product photo is representative of the kit rather than your exact parts. Other parts for this family are on our U660E and U760E parts page.
Inspect the hard parts carefully. Gears Magazine documents case wear at the main bearing support on the U660E from the V6's torque, internal bushing wear, and in extreme cases breakage at the torque converter input spline area; if the outer bearing race moves, the case needs repair before any rebuild will last. Check the drums for scoring and replace a damaged one with a U660E clutch drum. If the old steels are blued or warped, replace them, because this kit supplies frictions, not steels.
Valve body bores in this unit wear from constant pressure modulation, so a worn body should be addressed with the rebuild; a U660E shift kit or a replacement body are the usual options. Refill with genuine Toyota WS fluid; ATSG lists the U660E at 6.57 liters including the differential. Set the level hot at the overflow plug, then clear the adaptive values with a tool that can run Toyota's ECT reset.
| Fits | U660E 2007-11 |
| Part type | Banner Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Reference | ES350 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
A transmission overhaul kit with Viton seals, a standard set of friction plates, and late-design C2 pistons. It does not list steel plates, so plan to replace any heat-marked steels separately.
The lower-priced version is the same overhaul set and frictions without pistons. Choose this one when the original pistons are hardened, cracked or heat damaged.
AWD RX350 models use the U660F, which is a different unit. This kit is listed for the front-wheel-drive U660E, so check the plate on your transmission.
Toyota WS fluid only. ATSG lists the U660E capacity as 6.57 liters including the differential, and the level is set hot at the overflow plug, not with a dipstick.
Check the case bearing bore, all bushings, the drums and the converter input spline area. Gears Magazine notes these wear on high-mileage U660E units and a kit will not cure them.
