AW4 Clutch Module, new and ready to install. Fits the AW4. Ships fast from the USA.
A Jeep Cherokee XJ, Comanche or Wagoneer with the Aisin AW4 that now slips into gear, flares on the shift into overdrive or puts out dark, burnt-smelling fluid has usually worn through its friction plates. This module is a complete set of 28 friction plates for re-clutching the AW4, built from US-made friction brands. Depending on stock, the plates in each pack may come from Alto, Borg Warner, Raybestos or Allomatic, each to the AW4/A340 application.
The AW4 is a four-speed rear-drive automatic: a three-speed Simpson gearset with an overdrive unit in front of it. Gear changes come from three clutches (overdrive direct, forward and direct), four brakes (overdrive, second coast, second and first/reverse) and three one-way clutches. The factory overhaul manual explains the roles. The overdrive direct clutch connects the overdrive sun gear to the overdrive carrier, the overdrive brake holds that sun gear for fourth gear, the second brake holds the outer race of the No. 1 one-way clutch, and the first/reverse brake holds the rear planetary carrier. Each of those packs relies on friction plates clamped against steels. Once the lining wears, the pack slips and the heat it creates breaks down the fluid fast.
Frictions only. Steels, seals and gaskets are sold separately. The factory manual calls for different disc counts in four-cylinder and six-cylinder transmissions, and it lists six forward clutch discs and four overdrive brake discs for six-cylinder units, so lay your old plates out by pack and match the count before you build each drum.
The AW4 is controlled by three solenoids, and a failed shift solenoid or a bad sensor can make the unit hold one gear or shift erratically without any clutch wear. Check fluid level and condition first, then road test and note which shift slips. A stall test and a time-lag test, both covered in the factory manual, separate a slipping pack from a pressure or one-way clutch problem. Our Aisin slipping under load guide and the general slipping diagnosis guide walk through the order of checks. If shifts are late or harsh instead of slipping, see Aisin harsh or delayed shifts.
This module is listed for the AW4 used in the 1987-2001 Jeep Cherokee XJ, Comanche and Wagoneer, and it shares plate numbers with the Toyota A340 family that the AW4 is based on. Plate counts and tooth counts changed between four-cylinder and six-cylinder versions, so compare your plates to the new set. Send us the year and VIN if you want us to check it first. Browse all AW4 parts on our Aisin transmission parts page.
| Fits | AW4 |
| Part type | Clutch Module |
| Condition | New |
| Brand | OEM |
| Reference | A340 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for the Aisin AW4 in the 1987-2001 Jeep Cherokee XJ, plus the Comanche and Wagoneer that used the same transmission. Disc counts differ between four- and six-cylinder versions, so count your old plates.
No. The module is 28 friction plates only. Reuse your steels if they are flat and not heat-blued, or replace them if the unit slipped hot for a long time.
The module is built to A340-family plate counts. The AW4 factory manual lists six forward discs for six-cylinder units and five for four-cylinder units, so check the number you remove and add a plate if your drum needs six.
The factory overhaul manual calls for Mopar Mercon ATF and allows Dexron II if Mercon is unavailable. Soak the new frictions in the same fluid before assembly.
Yes. A failed shift solenoid can lock the AW4 in one gear or cause odd shifts. Check fluid, codes and solenoid resistance before tearing the unit down.
