A760E Clutch Drum

Searching for a direct clutch drum for a 2010-2019 Toyota Tundra or Sequoia with the 4.6L V8, or for a rear-drive Lexus GS 350 or IS 350 with the A760E six-speed? If the truck or car slips on the upper shifts, backs up slowly, or a teardown turned up a cracked drum or a scored sealing ring land, this is the hard part that fixes it. It is a used original-equipment Toyota/Aisin direct clutch drum, part number 117555A, cleaned and inspected, and it comes with the reverse clutch piston still installed in it, exactly as the photo shows.

What the clutch drum does in an A760E

The A760E is Aisin's electronically controlled six-speed for rear-drive Toyota and Lexus models. It shares its first five ratios with the five-speed A750 (3.520, 2.042, 1.400, 1.000, 0.716) and adds a 0.586 sixth gear, and the direct clutch drum is one of the hard parts the two families have in common. This drum houses two clutches: the direct clutch (often called C2) on the inside and the reverse clutch (C3) applied by the piston that sits in the outer bore. Apply oil enters through sealing rings on the drum hub, fills the piston cavity, and squeezes the plate stack against a selective flange. If the hub wears, the drum cracks at the spline teeth, or a check ball leaks, the pack it carries loses clamping force and starts to slip.

Symptoms of a worn A760E direct drum

• Flare or slip on the shifts that bring the direct clutch on, while first and second feel normal.
• Slow, soft or missing Reverse, especially backing a Tundra or Sequoia up a driveway or with a trailer.
• Dark, burnt-smelling fluid and friction material packed in the filter after heavy towing.
• Brass flakes in the pan from a worn hub bushing, or steel glitter from plates and thrust surfaces.
• A freshly rebuilt unit that still slips because the original drum went back in with worn ring lands.

Solenoid and valve body faults are the A760E's other common complaints, and they can produce the same flare. A stored solenoid code or erratic line pressure should be sorted out first.

How to confirm it before you buy

Check fluid level and condition, then run a line pressure test. Toyota's service data for the closely related A750F calls for 52 to 62 psi in Drive and 73 to 87 psi in Reverse at idle, and engagement lag under 1.2 seconds into Drive and 1.5 seconds into Reverse. Confirm the exact numbers for your vehicle in its own repair manual, but the logic is the same: low pressure everywhere points to the pump or valve body, while good pressure with slip in specific gears points to a clutch circuit such as this drum. Our line pressure testing guide explains the gauge hookup, and the flare versus slip guide helps you tell a timing problem from a worn clutch.

Fitment

This drum is listed for the A760E, and the same 117555A catalog number is used on the A750 and A761 families from 2003 on. A760E applications include the 2010-2019 Tundra and Sequoia 4.6L, the 2005-2007 Lexus GS 300, 2006-2013 GS 350 and the rear-drive IS 350. Four-wheel-drive Tundras, Sequoias and the GX 460 use the A760F version. Two drum heights exist in this family: this one measures 4.285 inches tall with a 6-7/8 inch outside diameter and a 2.650 inch inside diameter, while the other version is about 4-3/4 inches tall with a 7-1/2 inch OD. Measure your old drum before ordering, or send us your year and VIN and we will check it. Browse more parts for this gearbox in our Aisin transmission parts collection.

Install notes

• Pair the drum with new frictions, steels, piston seals and sealing rings. Our A760E master rebuild kit covers the soft parts.
• Inspect the hub bore and ring lands, then air-check both the direct and reverse pistons before the drum goes into the case.
• Set pack clearance with the selective flange. Toyota lists 0.50 to 0.80 mm for both the direct and reverse clutches on the A750F; verify your A760E figure.
• If the old unit showed low pressure or solenoid faults, address the A760E valve body at the same time.
• Fill with Toyota WS ATF and set the level at operating temperature through the check plug, then let the transmission control module relearn shift adapts.

Is this the direct clutch drum or the input drum?

It is the direct clutch drum, Toyota/Aisin part number 117555A, which carries the direct clutch inside and the reverse clutch piston in its outer bore. The reverse piston is included and installed.

Which drum height do I need?

This drum is 4.285 inches tall with a 6-7/8 inch OD. A taller version, about 4-3/4 inches with a 7-1/2 inch OD, also exists. Measure your original drum or send us your year and VIN before ordering.

Will it fit a 4WD Tundra or a GX 460?

Those use the A760F, the four-wheel-drive version of this gearbox. The drum is a shared hard part across the family, but confirm by measuring your old drum or sending your VIN before you order.

What else should I replace with the drum?

New frictions, steels, piston seals and sealing rings for the direct and reverse packs, plus a new filter. Reusing worn soft parts on a good drum usually brings the slip right back.

What fluid does the A760E use?

Toyota WS ATF. Check the level hot through the check plug after the rebuild and let the transmission relearn its shift adapts on a road test.

• How to Check Transmission Line Pressure With a Gauge
• Shift Flare vs Slip: What Is the Difference
• Aisin Slipping Under Load: Root Causes and Fixes
• Adaptive Relearn After a Valve Body Swap or Rebuild