A343F Overhaul Kit 1985-2000, new and ready to install. Fits the A343F. Ships fast from the USA.
If you are tearing down the four-speed automatic in an 80-series Land Cruiser, an LX450, an early 100-series LX470, a 1985-2000 4Runner, a Tacoma or a T100, this is the reseal kit for that job. It is a Precision International overhaul kit, part number K88900D, catalogued for the A340E, A340F, A340H and A343F built from 1985 to 2000. The photo shows the kit packed in individual bags of gaskets, so every case, pump and valve body joint goes back together with fresh material instead of a scraped and reused sheet.
The A343F is the heavy-duty member of the Aisin A340 family, used behind the big six-cylinder and V8 engines in four-wheel-drive Land Cruisers and the matching Lexus. It shares the same layout as the A340E: an overdrive planetary ahead of a Simpson gear train, with clutches and brakes applied by hydraulic pistons. Ratios are 2.804, 1.531, 1.000 and 0.753, with 2.393 in reverse. The front pump feeds the valve body, and the valve body routes pressure through the case and across sealing rings into the spinning drums. Every joint along that path is sealed by a gasket, an O-ring or a lip seal. After 20 years of heat cycles those parts harden and shrink, and the transmission starts leaking outside and losing apply pressure inside. An overhaul kit is what replaces them all at once during a rebuild.
This is a gasket and seal kit. It is not a friction kit, so it does not bring new clutch plates, steels or a band. If your packs are burnt, buy it together with a complete A340E, A340F and A343F master rebuild kit or source frictions separately.
Clean the case, drive 20 minutes and look for where fresh fluid appears first. A leak at the bottom of the bellhousing almost always means a pump seal; a leak where the transfer case bolts on is an adapter seal. For shift complaints, check fluid level and condition hot in Park, then read stored codes before deciding on a teardown. Late engagement with clean fluid points to internal seal leakage, while burnt, dark fluid usually means the frictions are also done. Our guide to Aisin harsh and delayed shifts walks through line pressure checks and the solenoid faults that can mimic a worn unit, and Aisin slipping under load covers the clutch side.
The kit is catalogued for these applications: Toyota 4Runner 1985 to July 2000, Toyota pickup 1985-1994, Tacoma 1995 to July 2000, T100 1993-1994 and T100 six-cylinder 1995 to August 1998, Land Cruiser 1995-1998, Cressida 1987-1992, Supra 1986-1988, Lexus LX450 1996-1997 and LX470 1998, and the Isuzu Trooper II four-cylinder from July 1987 to 1991. The A340 family changed over those years, and the catalog splits the 4Runner and Tacoma partway through 2000, which is why the cutoff dates read July 2000 rather than a model year. For a 4Runner, Tacoma, Tundra or Land Cruiser built after that change, use the 1999-2009 A340E and A343F overhaul kit instead. Compare your old gaskets to the kit before you clean anything, and if you are unsure, send us your year and VIN or the transmission tag code and we will check it. More parts for this family are in the Aisin transmission collection.
Before you decide which old parts to reuse, read our gasket and seal materials guide for why some seals harden and others swell.
| Fits | A343F 1985-2000 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Reference | K88900D |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. K88900D is the overhaul gasket and seal kit. Frictions, steels and the band are sold separately or as part of a master rebuild kit.
No. The kit covers units built up to July 2000 on 4Runner and Tacoma. For 2000-and-later production use the 1999-2009 A340E and A343F overhaul kit. Send us your VIN if your truck was built in mid-2000.
They share the same basic layout and gear ratios, but the A343F is the heavier-duty version built for the Land Cruiser and Lexus LX with larger engines. This kit is catalogued for both, along with the A340E and A340H.
Use what your owner's manual specifies. Later A340-family units call for Toyota T-IV, and older ones were filled with Dexron. A Land Cruiser A343F holds about 12.3 liters total, but a dry rebuild still needs a hot level check in Park.
A new filter at minimum. Check the pump bushing, the sealing ring grooves on the shafts, and the frictions. If the fluid was burnt, add frictions and steels; if the pump bushing is worn, replace the pump.
