A340E Overhaul Kit 1985-2000, new and ready to install. Fits the A340E. Ships fast from the USA.
Rebuilding the Aisin four-speed in an older 4Runner, pickup, T100, Supra, Cressida or a Jeep Cherokee with the AW4? This is the gasket and seal kit for the job. It covers the A340E, A340F, A340H, A341E and AW4 built from 1985 to 2000, and it is what stops the leaks and restores clutch apply pressure when a high-mileage unit starts slipping or engaging late. The box holds the overhaul gasket set, rubber seals and O-rings, metal clad seals, sealing rings, the pan gasket, extension housing seals and pump seals.
The A340E is a hydraulically applied four-speed: an overdrive unit up front, then forward and direct clutches, a second coast band and low and reverse brakes, all fed by a gear-type front pump through the valve body. Each clutch piston has rubber seals, and the rotating shafts carry sealing rings that pass fluid from the case into spinning drums. After years of heat those seals harden and the rings wear grooves, so pressure leaks away before it reaches the piston. The result is a soft or late shift even though the frictions may still have life in them. A full overhaul kit replaces every one of those sealing points in one pass.
Shift solenoid faults are common on this family too, but seals will not fix an electrical fault. On 1996 and later OBD-II trucks, codes such as P0750 or P0755 point to a solenoid circuit and should be chased first.
Check the fluid level and smell, look for wet spots at the bell housing, pan and tailshaft, and scan for codes. A line pressure test tells you whether pressure loss is real. If the fluid is dark and full of friction material, plan a full rebuild rather than a reseal; our rebuild vs replacement cost guide helps with that call, and the gasket and seal materials guide explains why 20-year-old rubber fails.
The listing covers A340E, A340F, A340H, A341E and Jeep AW4 transmissions from 1985-2000. These share most hard parts, but pan shapes, case details and seal counts vary between 2WD and 4WD versions and over the years. Match the transmission code on the case or send us your year and VIN before ordering. For 1999 and later units, compare our A340E overhaul kit 1999-2009, and more parts are on the Aisin parts page.
| Fits | A340E 1985-2000 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Reference | A340H |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is the seal and gasket kit only: gaskets, rubber seals, O-rings, metal clad seals, sealing rings, pan gasket, extension housing and pump seals.
The listing names the Jeep AW4 among its applications. The AW4 is close kin to the A340, but confirm the case and pan with your year and VIN before ordering.
Both are named in the listing. 4WD units use different tailshaft and transfer adapter seals than 2WD, so check that your extension housing seal matches during teardown.
Early units used Dexron-type ATF; later Toyota units specify Toyota Type T-IV. Use what your owner's manual or dipstick calls for.
Not if the cause is a sticking accumulator, a worn valve body or a bad solenoid. It cures leaks and pressure loss through worn seals and rings.
