Master overhaul kit for the Toyota A340E, A340F, A340H, and A343F automatic: frictions, seals, gaskets, and thrust washers for 4Runner, Supra, Cressida, and Crown.
A Toyota 4Runner that slips on the 2-3 upshift, a Supra that hangs in 3rd before overdrive, or a Cressida that flares between gears on a cold morning all lead to the same place once the fluid is dark and smells burnt: the Aisin A340 four-speed needs a full soft-parts overhaul. This master kit covers the A340E, A340F, A340H and A343F (Aisin 30-40LE family) and is listed for the 1989-2004 4Runner with the 2.4L, 2.7L and 3.0L V6, the 1988-1998 Supra 3.0L, the 1988-1992 Cressida 2.8L and 3.0L, and the Crown 3.0L. Two-wheel-drive and four-wheel-drive builds are both covered.
The A340 is a rear-drive four-speed with a separate overdrive planetary section in front of a three-speed gearset. Clutches, brakes and one-way clutches are applied by hydraulic pistons, and two shift solenoids plus a lockup solenoid tell the valve body which elements to feed. Over time the friction material glazes, the lip seals on the pistons harden, and the sealing rings on the shafts wear their grooves, so apply pressure leaks away and the unit slips. This kit replaces those wear items in one box: friction clutch plates, oil and lip seals, the pan and case gaskets, sealing rings, cushion rubbers, O-rings and a thrust washer set. The A340F and A340H 4WD units carry a transfer adapter at the tail, and the kit is listed for them as well.
Electrical faults on this transmission can feel exactly like worn clutches. The A340E selects gears by switching shift solenoids S1 and S2 on and off, and a FenderBender case study on a 2002 Tacoma traced a P0755 solenoid code and erratic shifting to a loose ground, not a failed part. Check the solenoid circuits and grounds, pull the pan to look for friction debris, and compare a flare to a true slip using our guide on shift flare versus slip. If the unit slips in every gear under load, our Aisin slipping under load guide walks through pressure checks before a teardown. If debris is present, a rebuild with this kit is the fix.
The listing covers the A340E, A340F, A340H and A343F for the 4Runner 1989-2004, Supra 1988-1998, Cressida 1988-1992 and Crown 3.0L. Toyota used this family in many more trucks and cars with different torque capacities, and the A343F is mostly found behind Land Cruiser and Lexus LX V8 engines, so read the identification on your case and send us the year, model and VIN if you are working on anything outside the list. Sonnax also splits the valve bodies at 2000, with late V6 and V8 castings that are not the same as early ones; that matters for the valve body you reuse, not for this soft-parts kit. Browse the full Aisin and Toyota transmission parts range for matching hard parts.
| Transmission | Toyota A340E, A340F, A340H, A343F (Aisin AW30-40LE) |
| Fits | 4Runner 1989-2004 (2.4L/2.7L/3.0L V6), Supra 1988-1998 (3.0L), Cressida 1988-1992 (2.8L/3.0L), Crown 3.0L |
| Drivetrain | 2WD and 4WD (A340F / A340H) |
| Kit type | Master overhaul (frictions, seals, gaskets, sealing rings, thrust washers) |
| OEM part numbers | A340E, A340F, A340H, A343F |
| Ships | From the USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. The kit is listed for the A340F and A340H four-wheel-drive versions as well as the two-wheel-drive A340E, for the 1989-2004 4Runner with the 2.4L, 2.7L and 3.0L V6. Confirm the code on your case before ordering if you are unsure which unit you have.
The listed contents are friction plates, oil and lip seals, pan and case gaskets, sealing rings, cushion rubbers, O-rings and thrust washers. Reuse the steels and pump if they measure in spec, and plan to buy a pump or filter separately if yours are worn or missing.
Often it is not. The A340E selects gears with shift solenoids S1 and S2, and wiring or ground faults can cause erratic shifts and solenoid codes such as P0755 with perfectly good clutches. Test the circuits first.
Earlier A340 trucks and cars were filled with Dexron-type ATF and later ones with Toyota Type T-IV. Use whatever your dipstick or owner's manual specifies for your year.
The A343F is listed on this kit, but Toyota fitted that unit to several V8 trucks with their own internal variations. Send year, model and VIN and we will confirm before it ships.
