Complete master overhaul kit for the Aisin AA80E 8-speed in the Lexus LS460, GS460 and IS F: frictions, steels, gaskets, sealing rings and lip seals.
If your Lexus LS460, GS460 or IS F is flaring on the upper shifts, banging into second or third, or smelling burnt with dark fluid at the overflow plug, the eight-speed behind that V8 has usually worn its clutch packs or hardened its piston seals. This is a master overhaul kit for the Aisin AA80E: friction plates, steel plates, valve body separator gaskets, the pan gasket, Teflon sealing rings, piston and case O-rings and the bonded lip seals, packed for a complete teardown instead of a partial reseal.
The AA80E was the first eight-speed automatic in a production car when Toyota put it in the 2007 LS460. Inside, a simple front planetary set feeds a Ravigneaux gearset, and eight forward ratios come from six apply elements, four clutches and two brakes, plus a low one-way clutch. The C2 drum is splined directly to the turbine shaft. Because every shift is a hand-off between two of those elements, the TCM times each one by watching how quickly the pack fills and grabs. Once the frictions glaze or a piston seal stops holding pressure, that timing falls apart, and a fluid exchange cannot restore the friction material or the seal lip. A master kit lets you renew every friction and steel and re-seal every piston and drum in one job, so the unit comes back with even clearances and fresh sealing throughout.
Check fluid level correctly first. The AA80E has no dipstick; level is set at the overflow plug with the fluid at the specified temperature, and a unit that was run low will show the same flare as worn clutches. Then pull the pan. Heavy friction material, steel glitter or a dark, varnished filter means the packs are done and a rebuild is the honest fix. Read live data for slip on each shift and compare input and output speeds; our guide to Aisin slipping under load walks through which readings separate a mechanical slip from a pressure or solenoid problem. If the fluid is clean and the complaint is only harsh shifts, work through harsh and delayed Aisin shifts before committing to a teardown.
The listing covers the Lexus LS460 4.6L 2007-2014, the GS460 4.6L 2008-2011 and the IS F 5.0L 2008-2014, and cross-references AA80E kit numbers B208820A, B208880A and W208881A. It also names the 2014-2019 Cadillac CTS 3.6L. That car uses the TL-80SN, Aisin's version of the same eight-speed built for other manufacturers, so check the tag on your case before ordering. Read the Aisin ID plate on the side of the transmission. If it does not read AA80E or you are unsure, send your year and VIN and we will confirm before it ships. More parts for this family are in our Aisin transmission collection and the full rebuild kit category.
Tear the unit down in order and keep every pack together so you can compare old and new plate counts. Inspect the drums, bushings and the pump before anything goes back in; new frictions will not survive a scored drum or a worn pump bushing. Soak the new frictions in Toyota WS fluid before assembly, stack each pack and measure clearance against the factory figure, and use selective plates or snap rings to correct it. A dial indicator with magnetic base makes clearance and end play checks repeatable, and a proper clutch spring compressor keeps the return springs from cocking the new pistons. Lube sealing rings with assembly gel, clean the valve body, and lay the new separator gaskets down flat and straight.
Fill with Toyota WS fluid only, set the level at the overflow plug at operating temperature, and flush or replace the cooler so debris from the old clutches does not come back. Finish by clearing the learned values with a scan tool and driving the car through every shift so the TCM relearns the new packs. Our relearn after a rebuild guide covers what to expect on the first drives.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The listing names the CTS 3.6L. That car uses the TL-80SN, Aisin's version of this eight-speed for other manufacturers. Read the ID plate on your case and send your VIN if you want us to confirm before ordering.
Toyota WS (World Standard) ATF. Do not mix in a universal multi-vehicle fluid. Level is set at the overflow plug with the fluid at the specified temperature, since the unit has no dipstick.
The listed contents are frictions, steels, separator gaskets, pan gasket, sealing rings, O-rings and lip seals. Plan to source the filter and any worn bushings separately after you inspect the unit.
Only if the fluid was low or badly degraded and the clutches are still healthy. If the pan shows friction material or steel debris, the packs are worn and new fluid will not bring the shift quality back.
Yes. Clear the learned shift values so the TCM starts fresh on the new clutch packs, then drive through every gear at light and moderate throttle so it can relearn the fill times.
