AW4 Overhaul Kit 1986-2002, new and ready to install. Fits the AW4. Ships fast from the USA.
When a Jeep Cherokee XJ or Comanche with the AW4 four-speed starts flaring between gears, slips going into overdrive, or comes out of a pan drop with burnt fluid and friction material in the bottom, the clutch packs are finished and the seals are usually hard. This kit is built for that teardown. It covers the AW4 and its Toyota relatives, the A340E and A341E, and it is the complete version: a full overhaul gasket and seal set, a complete set of Borg Warner friction clutches, front and rear seals, and all of the steel clutch plates. That last part matters, because many cheaper kits make you reuse heat-checked steels.
The AW4 is an Aisin Warner four-speed electronic automatic. It shifts by applying clutch packs and brakes in combination, including the overdrive direct clutch and overdrive brake up front and the forward, direct and second brake packs behind them. Every pack is a stack of friction discs splined to one member and steel plates splined to the other, squeezed together by a hydraulic piston. The rubber piston seals and the sealing rings hold that pressure. When frictions glaze or wear thin and the steels discolor, the packs slip; when seals harden, pressure leaks off and the slip gets worse. This kit replaces every one of those wear surfaces at once: frictions, steels, piston seals, sealing rings, gaskets and the front and rear seals.
An AW4 is computer controlled, so rule out the electrical side first. Shift solenoid faults and sensor problems are common on this transmission and can feel like slipping or a missing gear. The 1997 Cherokee service manual specifies checking each shift solenoid for 11-15 ohms; a solenoid out of range is a far cheaper repair, such as the AW4/A340 shift and TCC solenoid kit with filter. Next pull the pan. Clean fluid with no debris points back to electrical or valve body problems. Heavy friction material, burnt fluid, or flaring that persists with good solenoids means the clutch packs are worn and the unit needs this kit.
The listing covers 1986-2002 and is sold for the AW4 and the A340E/A341E family. Note that Jeep did not offer the AW4 in a 1986 model year vehicle; it arrived in the 1987 Cherokee and Comanche and ran through the 2001 Cherokee XJ, and it was also used in early Grand Cherokee ZJ models. The later years in the range apply to Toyota A340E and A341E applications. Internal parts changed over this period, so check the clutch count in your old packs against the kit before you start, and send us your year and VIN if you want us to confirm. See all our Aisin transmission parts on the Aisin collection page.
| Fits | AW4 1986-2002 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Reference | A340E |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. It includes a full overhaul gasket and seal set, a complete Borg Warner friction clutch set, front and rear seals, and all the steel clutch plates. The bands, bushings, filter and solenoids are not listed as included, so inspect those separately.
The kit is sold for the AW4 used in 1987-2001 Cherokee XJ and in the Comanche and early Grand Cherokee. There was no 1986 model year AW4 Jeep even though the range starts at 1986. Send your year and VIN if you want us to confirm.
The kit is listed for the AW4, A340E and A341E. These are close relatives, but clutch counts differ by application, so compare your old packs to the kit before assembly or send your year and VIN.
Jeep specifies Dexron IIE or Mercon for the AW4, and the AW4 overhaul manual lists Mercon with Dexron II as the alternate. Soak the new frictions in the same fluid for 30 minutes before installing them.
It is a good idea on a high-mileage unit. Shift solenoid faults are one of the AW4's known problems, and they are easy to replace while the pan and valve body are off.
