U660E Input Drum 2007

Shops call it the input drum because it rides on the transmission input shaft; Toyota's own name is the forward and direct clutch drum. Whatever you call it, it is the part behind a V6 Camry, ES350, Avalon or Venza that slips on acceleration, flares into fifth, or loses Drive while Reverse still works. This assembly is a rebuilt original U660E drum for 2007-and-later units with a 40-lug piston. The listing says it is built ready to install, with new clutches and new pistons, and new steels fitted where the originals did not pass inspection.

Why the input drum matters in a U660E

The torque converter turbine turns the input shaft, and the input shaft carries this drum. Everything the engine sends to the gear train passes through it. ATSG's U660E service information charts two clutches here: C1, the forward clutch, which is on in first, second, third and fourth, and C2, the direct clutch, which is on in fourth, fifth and sixth. Pressurized fluid travels up the shaft past sealing rings to the two pistons. That design means three things wear: the friction packs, the piston seals, and the sealing ring lands and bushings that keep oil where it belongs. Lose any of them and the clutch it feeds starts to slip.

Symptoms of a worn input drum

• Delayed or soft engagement into Drive, worst when the fluid is hot
• Flare or slip in first through fourth (forward clutch)
• Slip after the 4-5 shift or in sixth on the highway (direct clutch)
• Drive is gone but Reverse still moves the vehicle
• Dark fluid and friction material in the pan after a short service interval

Check these first

A slipping complaint is not always the drum. Gears Magazine lists wrong or worn fluid as a cause of flaring shifts and pressure solenoid codes in this transaxle, so confirm Toyota WS fluid at the correct hot level before anything else. On the U660E the TCM bolts directly to the case connector, and Gears notes those modules fail with circuit performance codes and U0402, which can mimic a mechanical problem. With electrical and fluid faults ruled out, read pressure at the C1 and C2 test ports ATSG shows on the case. Normal readings with slip mean the drum. Low readings across the board point to the pump or valve body; our U660E and U760E problems guide walks through those valve body wear points.

Fitment

The listing covers U660E and U660F transmissions from 2007 onward with the 40-lug piston design. According to Gears Magazine, the U660E went into the Camry V6 and ES350 for 2007, the Avalon for 2008 and the Venza for 2009. Toyota built more than one drum style for this family; we also offer an early 2007-2009 drum with an 8-lug direct retainer, so count the lugs on your old piston and compare the shaft length and spline count with the photos before you buy. The four-cylinder U760E uses a different drum. Not sure? Send us the year, model and VIN and we will check it. See every part for this family on the U660E transmission page.

Installing it

• Clean or replace the cooler before the new drum goes in. Burnt lining left in the circuit will contaminate the fresh clutches.
• Check the case bearing support. Gears Magazine reports U660E cases wear at the main gear train bearing, causing centerline and bushing wear; if the outer race moves, repair the case first.
• Use new input shaft sealing rings, pre-lube them with WS fluid, and air-check both pistons through the case before installing the valve body.
• Measure clutch clearance against the factory specification.
• Refill with WS fluid, set the level hot as described in our U660E fluid guide, and clear the adaptive memory with the ECT reset.

For the rest of the unit, the U660E banner rebuild kit for 2007-2011 supplies the gaskets, seals and remaining frictions, and a remanufactured Camry U660E valve body addresses the pressure loss that often burns this drum in the first place.

Is an input drum the same as the forward/direct drum?

Yes. On the U660E the forward (C1) and direct (C2) clutches share one drum mounted on the input shaft, so it is sold under both names.

What does 40-lug piston mean for fitment?

It describes the piston design this drum is built with. Count the lugs on your old piston and compare the shaft with the photos; we also carry an early 8-lug version for 2007-2009 units.

Will it fit my 2010 Camry with the four-cylinder?

No. Four-cylinder Camrys from 2010 use the U760E, which has its own drum. This part is for the V6 U660E and the AWD U660F.

Are the clutches and steels new?

The listing states new clutches and new pistons, with steels replaced as needed during the rebuild. It ships assembled and ready to install.

Do I need a scan tool after installing it?

Yes. Clear codes in all modules and run Toyota's ECT memory reset so the TCM relearns shift pressures on the new clutches. Disconnecting the battery does not clear these values.

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