AW4 Shift Kit 1985, new and ready to install. Fits the AW4. Ships fast from the USA.
A Jeep Cherokee XJ, Comanche or Wagoneer with the AW4 that shifts harsh on a cold morning, goes soft and slow once it warms up, takes too long to kick down when you floor it on the highway, or runs hot with a converter that will not stay locked is a good candidate for this kit. It is the TransGo SK 340, which TransGo calls a Shift Kit Valve Body Repair Kit. It is aimed at restoring a worn AW4 valve body to correct, durable shifting rather than turning the truck into a hot rod. New, made in the USA, and ships fast from the USA.
The AW4 is the Aisin Warner four-speed Jeep shared with the Toyota A340 family. Two shift solenoids decide which gear you get, but the feel of each shift is hydraulic. The pressure regulator sets line pressure, separator plate orifices meter oil to the 1-2, 2-3 and 3-4 shift circuits, and accumulator pistons cushion the second brake (B2), the third gear clutch (C2) and the fourth gear brake (B0). Over time the lock-up relay valve wears its soft aluminum bore, the original springs relax and the shifts get longer and slipperier. The SK 340 attacks each of those areas. You get a USA-made hardened steel TCC relay boost valve and bushing, a blue pressure regulator spring for Type 1 valve bodies, an orange pressure regulator spring and thicker washer for Type 2, 3 and 4 bodies, short, medium and long accumulator spacers, six new accumulator springs and a 0.055 inch drill bit for the shift feed holes.
How it differs from our TransGo 340-HD2 AW4 kit: the 340-HD2 adds a hardened low hold 1-2 shift valve, three cut back valve springs and five drill bits for truck or hot rod calibration. The SK 340 is the simpler repair kit for a daily driver that just needs to shift like new again.
It will not cure a dead shift solenoid, a faulty neutral safety switch or speed sensor, or clutch packs that are already worn through. Those are common AW4 failures in their own right.
Start with fluid level and condition, then put a gauge on it. The Jeep AW4 overhaul manual lists 53-61 psi at idle and 161-196 psi at wide open throttle in Drive, and 73-87 psi idle and 223-273 psi at WOT in Reverse. Low or flat readings point at the throttle cable or regulator. Our line pressure testing guide shows the hookup, and Aisin harsh or delayed shifts walks through the other causes. If shifts go both soft and hard and line pressure does not follow the throttle, TransGo notes that a stuck EPC solenoid on Type 3 bodies can be the culprit, not the springs.
TransGo lists the SK 340 for 1985-on A340, A341, A343 and Jeep AW4 four-speeds, and the current instruction sheet covers 1987-2014 units. The 1985 in our listing title is the start of that kit coverage on the Toyota side; in a Jeep the AW4 runs 1987-2001. The instructions split the valve body into four types by solenoid layout and relief valve position, and the pressure regulator parts differ by type, so identify yours before you start. Type 1 bodies have seven different gasket variations. If you are unsure, send us your year and VIN. More AW4 and Aisin parts are in our Aisin collection.
If the fluid was burnt or full of friction material, install the kit with an AW4 overhaul kit, and replace tired solenoids with the AW4 solenoid kit while the body is out.
| Fits | AW4 1985 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Reference | SK340 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. This is the TransGo SK 340 valve body repair kit. It shares the hardened TCC relay boost valve, pressure regulator and accumulator parts, but the 340-HD2 adds a low hold 1-2 shift valve, cut back valve springs and extra drill bits for firmer truck or performance calibration.
TransGo lists the SK 340 for the Jeep AW4 along with the Toyota A340, A341 and A343. Identify which of the four valve body types you have before starting, and send us your year and VIN if you want fitment confirmed.
No. Everything in the SK 340 installs at the valve body and accumulators, which you reach by dropping the pan and removing the valve body with the transmission in the vehicle.
No. Buy a valve body gasket set for your body type separately; Type 1 bodies alone have seven gasket variations, so match the old gasket before ordering.
Use the Dexron or Mercon type ATF your Jeep owner's manual specifies, fill through the dipstick tube, and check the level at operating temperature.
On Type 2, 3 and 4 valve bodies the new hardened lock-up relay boost valve and bushing correct the most common cause of lockup slip and overheating. The Type 1 lock-up relay assembly is not furnished and is sold separately by Toyota.
