AW4 Overhaul Kit 1999-2009, new and ready to install. Fits the AW4. Ships fast from the USA.
Listed under the AW4 family name, this kit is really built for the later Toyota members of that family: the A340E, A340F and A343F used in Tacoma, 4Runner, Tundra, Sequoia and Land Cruiser trucks from the 1999-2000 redesign onward. It is a Precision International kit, part number K88900DL, covering 1999-2009. Buyers usually find it because their truck has started weeping fluid at the bellhousing, because Reverse takes a moment to grab when the truck has sat overnight, or because the transmission is already out for clutches and the old seals are not worth reusing.
Toyota kept the basic AW4/A340 layout for decades: a gear-driven front pump, a valve body with shift and lock-up solenoids, and clutch and brake pistons fed through sealing rings on the input and output shafts. Around 1999-2000 the case, valve body and some sealing details were revised, which is why the soft parts for a late truck are not the same as the early AW4 and A340 sets. This kit carries the full sealing layer for that later design: gaskets, lip seals, O-rings, piston seals, sealing rings and the small rubber pieces. Frictions, steels, bands, the filter and the pump bushing are not included, so plan those around what you find at teardown.
If the truck suddenly loses a gear or will not shift into overdrive, look at the solenoids before you buy seals. On these trucks a code such as P0750, P0755 or P0770 points at a solenoid circuit, and the 2000-up A340E solenoid kit is the usual fix.
Scan for codes first, then check the fluid hot on level ground. Bright red fluid with a leak means seals; brown, burnt-smelling fluid with debris in the pan means the clutches are done and you need frictions too, such as the A340E master rebuild kit with frictions and steels. Our ATF color and smell chart covers what to look for, and the gasket and seal materials guide explains why decades-old rubber stops sealing.
The kit is for the late A340 family, 1999-2009. Toyota switched to the late design at different build dates on each truck, not at a clean model year. Late-design applications include 4Runner and Tacoma from August 2000, Tundra from February 1999 and Sequoia from September 2000, plus 1999-2003 Land Cruiser and 1999-2002 LX470. Because of those mid-year splits, a 2000 4Runner can need either kit. Check the build date on the door jamb, compare your old pan gasket with the new one, or send us the year and VIN. Jeep AW4 owners should start with the 1985-2000 AW4 overhaul kit, and the 2000-up revision kit is the alternative for late Toyota units. Browse all of our A340 and AW4 parts on the Aisin transmission page.
| Fits | AW4 1999-2009 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The A340 family started out as the Aisin Warner AW4 design and still carries that name in parts catalogs. This K88900DL kit is the late design, so it is aimed at 1999-2009 Toyota trucks rather than Jeep Cherokees.
Use the 1985-2000 AW4 overhaul kit for Jeep applications. If you have a 2001 XJ, send us the VIN and we will confirm which kit matches.
The change happened at an August 2000 build date on those trucks. Check the build date on the driver door jamb sticker, or send us the VIN and we will match the kit.
No. This is the gasket, seal and sealing ring set. Frictions, steels, bands, the filter and the pump bushing are sold separately.
Refill with the correct fluid, check the level hot, and road test through all four gears and lock-up. Inspect the pan, cooler lines and bellhousing for leaks after the first drive.
