U660F Clutch Drum, used and ready to install. Fits the U660F. Ships fast from the USA.
The U660F is the all-wheel-drive version of Toyota's V6 six-speed, found in AWD Highlanders, Lexus RX350s, Siennas and Venzas. When one of those loses Drive, flares between gears or comes apart with a damaged drum, this is the part that carries the repair. It is a genuine Toyota C1/C2 clutch drum assembly, part number 35650-33010, with the input shaft and both pistons, pulled from a working unit. The drum, shaft splines, teeth and pistons are clean with no cracks. The original steels show heat discoloration, so the clutch pack should be replaced with new frictions and steels during your build.
The F suffix adds the transfer drive for the rear wheels, but the gear train inside the transaxle is the same as the U660E, and so is this drum. ATSG lists two driving clutches, C1 and C2, and both live here. C1 is applied from first through fourth and C2 from fourth through sixth, with both on together for the 1.000 fourth gear. A loaded Highlander or Sienna working hard on a hot day puts real heat into these packs, and heat is what discolors steels like the ones in this assembly and hardens piston seals.
On an AWD vehicle, first rule out the driveline: a failed transfer or rear drive unit makes noise and binding, not engine flare. Then check the WS level hot, because low fluid mimics clutch slip. The Sonnax vacuum test guide for the U660E and U660F lists the valve body wear points that cause pressure loss, and pressure at the C1 and C2 case taps tells you whether oil is reaching the drum. Good pressure with slip is a drum problem. Our U660E and U760E problems guide explains how to tell those faults apart, including the shudder that is really a converter clutch issue.
This drum fits the U660F used in AWD V6 applications of the Highlander, RX350, Sienna and Venza, and it also fits the front-drive U660E. Toyota revised the drum in production, and we list the 2010 U660F drum separately, so check that your old drum's input shaft length, spline count and sealing ring grooves match the photos. The four-cylinder U760F drum is not the same part. Send us your year, model and VIN if you want us to confirm before you order. Everything for this family is on the U660E and U660F collection page.
| Fits | U660F |
| Part type | Clutch Drum |
| Condition | Used |
| 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.
No. The U660F adds the AWD transfer drive, but the C1/C2 drum, Toyota 35650-33010, is shared between the two. Toyota did revise the drum during production, so match your old part.
AWD versions of the V6 Highlander, Lexus RX350, Sienna and Venza. Front-drive versions and the Camry, Avalon and ES350 use the U660E.
No. It includes the original clutches and steels, and the steels show heat discoloration. The drum, shaft and pistons are sound; install new frictions and steels.
That pattern fits a C1 failure, because ATSG shows C1 applied in first through fourth but not in Reverse. Check fluid level and C1 pressure first to confirm.
Toyota WS in the transaxle, with the level set hot through the overflow plug per Toyota bulletin T-SB-0036-13.
