Complete overhaul kit for the Aisin A340E/A340F 4-speed: frictions, steels, gaskets, seals and sealing rings for 4Runner, Supra, Cressida and Crown.
If your 4Runner hesitates going into overdrive, your Supra slips on the 2-3 shift when it is hot, or a Cressida takes a long pause before it grabs Drive, and the fluid on the dipstick is brown and smells burnt, the Aisin A340 inside has worn its clutch packs. This master kit is built for that teardown on the A340E (two-wheel drive) and A340F (four-wheel drive). It packs the lined friction plates and the steel plates together with the overhaul gasket and seal set, so you are not ordering plates and soft parts separately and hoping they match. The listing also names the A340H, A341E and A343F, and covers the 1989-2004 Toyota 4Runner, 1988-1998 Supra, 1988-1992 Cressida and the 3.0L, 3.4L and 4.0L Crown.
The A340 is a four-speed rear-drive automatic: an overdrive planetary sits ahead of a three-speed gearset, giving 2.804, 1.531, 1.000 and 0.705 ratios. Each gear is held by a clutch pack or brake that a hydraulic piston squeezes, plus one-way clutches that hold on their own. When the friction lining glazes and the piston lip seals and D-rings harden, apply pressure bleeds off and the pack slips instead of locking. According to GearBoxList, when an A340E has run on dirty fluid the forward clutch usually burns first, followed by the 2nd brake and then the low/reverse brake, which is why a complete plate set makes more sense than replacing one pack. This kit replaces the frictions, steels, cork pan gasket, front pump and extension housing seals, piston seals, D-rings, and the Teflon and cast iron sealing rings on the shafts and drums. The photo also shows the plastic thrust washers.
An A340E picks gears by turning its two shift solenoids on and off, so a wiring fault can feel just like a slip. One documented 2002 Tacoma case traced erratic shifting and a P0755 code to a loose ground rather than a bad part. Check the fluid level and condition first, scan for codes, and test the solenoid circuits and grounds. If the electrical side checks out, pull the pan: clutch material in the pan means the unit needs this kit. Our guide on Aisin slipping under load covers the pressure checks, and shift flare vs slip helps you tell a timing problem from worn plates.
Listed fitment is the 1989-2004 4Runner, the 1988-1998 Supra, the 1988-1992 Cressida, and the Crown 3.0L, 3.4L and 4.0L. The plate set is listed for the A340E and A340F, with the A340H, A341E and A343F also named. Those units do not all use the same stack. For example, a 2003-2004 4Runner with the V8 used a five-speed, not an A340, and Sonnax documents different valve body castings for 2000 and later A340 units. Before you tear in, read the tag on the case and compare the plate count and pan gasket shape to your old parts, or send us the year and VIN and we will check it. You can browse all of our Aisin parts on the Aisin transmission parts page.
| Type | Master overhaul kit with friction and steel plates |
| Fits | Aisin A340E, A340F (also listed for A340, A340H, A341E, A343F) |
| Vehicles | 1989-2004 Toyota 4Runner, 1988-1998 Supra, 1988-1992 Cressida, Crown 3.0L/3.4L/4.0L |
| Includes | Frictions, steels, pan gasket, pump and extension seals, piston seals, sealing rings |
| Item weight | 9.53 lb |
| Condition | New |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for the A340F, the four-wheel-drive version used in the 4Runner. Confirm the transmission tag and compare the plate count to your old parts, since 4WD and 2WD units and different years can use different stacks. Send us the year and VIN if you are unsure.
You get lined friction plates, steel plates, the cork pan gasket, front pump and extension housing seals, piston lip seals, D-rings, sealing rings and thrust washers. Hard parts like the pump, drums, bands and the valve body are not included, and neither is a filter.
Toyota specifies Type T-IV ATF for the A340E. Use a T-IV compatible fluid for soaking the frictions and for the refill.
Not by itself. Solenoid codes come from the solenoid circuits, and a loose ground can cause erratic shifts. Rule out the electrical side first; this kit fixes slipping from worn frictions and leaking seals.
The A343F is named on the listing, but it is the heavier-duty version found mainly behind V8 engines and its clutch stack can differ. Compare the plates to your originals or send us your VIN before ordering.
