Master overhaul kit for the Toyota and Lexus A760E and A761E six-speed: clutch frictions, steels, and the full seal and gasket set for a rebuild.
A Lexus IS350, GS350, GS430 or SC430 that slips on the 2-3 shift, flares in the upper gears or keeps setting solenoid performance codes after the solenoids were already replaced is often a six-speed with worn clutches. This master overhaul kit covers the Aisin A760E six-speed and the related A761E, and carries the friction plates, steel plates and the full rubber and gasket set you need for a bench rebuild. It lists OE overhaul references W188881A, B188820A and B188880A.
The A760E is a rear-wheel-drive six-speed with ratios of 3.520, 2.042, 1.400, 1.000, 0.716 and an overdrive sixth of 0.586. The A761E is a sister unit used behind the V8 in cars like the LS430, GS430 and SC430, with its own slightly different ratio set. Each gear is held by a clutch or brake applied through lip seals, O-rings and sealing rings. This kit renews the frictions and steels in those packs and every soft seal and gasket, so the whole unit is resealed in one job. Hard parts such as drums, shafts, the pump, the valve body and planetaries are not included and are reused from your core after inspection.
Sonnax points out that on the A761, AB60 and A960 six-speeds a solenoid performance code sets when the computer sees the wrong gear ratio, and a slipping clutch can trigger it just as easily as a failed solenoid. That is why a parts-swap approach on these cars often ends in a teardown anyway.
Record live data on a drive: commanded gear, input and output speed, and line pressure solenoid duty. If the ratio drifts during or after a shift while solenoid commands look correct, the clutch is slipping. Our guide to reading transmission live data explains which numbers to watch. Bench test the solenoids too; a weak one is cheap to replace with a nine-piece A760E solenoid kit while the valve body is out.
The listing covers the 2006-2009 Lexus IS250 2.5L and IS350 3.5L, 2007-2008 GS350, 2006-2007 GS430, 2006 GS300, 2006-2008 SC430, 2004-2005 LS430 and the 2005-up Toyota Crown. IS250 owners need to check the tag before ordering: published application lists show the rear-drive IS of that generation using the A960E, with the A760H in all-wheel-drive models, and neither of those is the A760E or A761E. Read the transmission code on the case and compare it to the OE kit numbers above, or send us your year and VIN and we will confirm fitment. All of our Aisin parts are on the Aisin transmission page, and V8 owners can compare our A761E master kit.
Build each pack and measure clearance as you go; new frictions rarely stack to the same height as the worn ones, so expect to change selective plates or snap rings. Soak the frictions in clean Toyota WS fluid first, air-check every apply circuit before the case is closed, and check end play before the extension housing goes on. The valve body on these units wears too, so a shift kit is a sensible addition. Flush the cooler, fill with Toyota WS, set the level at operating temperature through the check plug, and clear adaptive values afterward as described in our adaptive relearn guide.
| Transmission | |
| Type | |
| OE kit references | |
| Kit contents | |
| Fitment |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Only if your car actually has an A760E or A761E. Many rear-drive IS250s of that generation are listed with the A960E and all-wheel-drive versions with the A760H. Read the code on the transmission tag or send us your VIN before ordering.
Both are Aisin rear-wheel-drive six-speeds. The A761E was used behind the V8 in cars such as the LS430, GS430 and SC430 and has slightly different gear ratios. This kit is listed for both.
It includes clutch frictions, steel plates, seals and gaskets. Drums, shafts, the pump, the valve body and solenoids are reused from your core unless you replace them separately.
Yes. On these Aisin six-speeds a solenoid performance code sets when the gear ratio is wrong, and a slipping clutch causes that just as a stuck solenoid does. Test the solenoids and watch ratio data before deciding.
Toyota WS ATF. Pre-soak the new frictions in it, then set the level at operating temperature through the check plug, since these units have no dipstick.
