AW4 Valve Body 1986-1999, remanufactured and ready to install. Fits the AW4. Ships fast from the USA.
If your 1986-1999 Jeep Cherokee, Comanche or Wagoneer is slow to engage from Park or Neutral, has lost overdrive with a 1-2 shift solenoid code, won't hold torque converter lockup once it's warmed up, or feels like it drops a gear on its own, the AW4's hydraulic brain - the valve body - is one of the most common places that complaint starts. This is a remanufactured, bench-ready AW4 valve body for 1986-1999 applications, so you install a known-good unit instead of chasing worn bores and a drifting solenoid feed piece by piece.
The AW4 is a four-speed, Aisin-Warner-built automatic that was co-designed by AMC and Borg-Warner and shares many parts with Toyota's related Aisin 450-43LE family - which is why you'll see an A340E cross-reference on parts for this unit. The valve body routes line pressure through precision bores and spool valves to apply each clutch and band, and carries the shift and torque-converter-clutch solenoids the computer uses to time every shift and lockup event. Even with the shared Aisin-Warner lineage, the AW4 and Toyota's A340E are not drop-in interchangeable at the valve body - the hydraulic circuits and shift logic differ enough that swapping between the two is not a simple parts-bin fix.
A generic P0700 code on these Jeeps is just a messenger telling you the TCM logged a fault - it isn't a diagnosis by itself, so pull the specific transmission code behind it before replacing anything. On 1996-2001 Cherokees, the two most common culprits behind shift and engagement complaints are the valve body's shift solenoids and a worn or dirty Neutral Safety Switch, so check the NSS and solenoid wiring for corrosion or a poor ground before assuming the valve body itself is bad. If the solenoids and NSS test fine and the symptoms above persist, the wear is in the valve body's bores.
This valve body is built for the AW4 as used in the 1987-2001 Jeep Cherokee XJ, 1987-1992 Comanche and the related Wagoneer applications from 1986-1999, running Dexron or Mercon ATF. One real fitment detail to check: the AW4's output shaft changed from a 21-spline to a 23-spline design around the 1990-1991 model year alongside the High Output 4.0L six, so on a 4x4 model from that window, confirm your spline count and transfer case input rather than assuming every 1986-1999 unit is identical - the valve body itself is common across the range, but match your connector count and casting marks against the listing photos or send your year and drivetrain so we can confirm. The Aisin transmission parts collection covers the related AB60 and TF-80SC families we also stock parts for.
Drop the pan and filter at the same time as the valve body swap so debris from the old unit doesn't circulate into the new one, torque the valve body bolts evenly to spec, and refill with Dexron or Mercon ATF. Clear codes and road-test to confirm lockup and shift timing return to normal. If your complaint was a single stored solenoid or TCC code rather than a broad shift problem, a lower-cost AW4 solenoid kit or standalone AW4 TCC solenoid may fix it without replacing the whole valve body. Pair this swap with a AW4 transmission cooler if converter lockup problems have been cooking the fluid, and consider the AW4 shift kit if you want firmer, more direct shifts on the way back in.
| Fits | AW4 1986-1999 |
| Part type | Valve Body |
| Condition | Remanufactured |
| Brand | Sonnax |
| 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.
It's built for the AW4 as used in the Jeep Cherokee XJ, Comanche and Wagoneer across this span. The output shaft changed from 21-spline to 23-spline around 1990-1991 on 4x4 models with the High Output 4.0L six, so confirm your spline count and drivetrain, or send us your year and model to be sure.
No. The AW4 and Toyota's related A340E (Aisin 450-43LE family) share a lot of parts and lineage, but the valve body hydraulic circuits and shift logic differ enough that the two are not a drop-in swap for each other.
Slow or delayed engagement from Park or Neutral, lost overdrive with a stored 1-2 shift solenoid code, a torque converter that won't lock up when hot, and flared shifts or an unexpected downshift out of overdrive.
P0700 is a general code telling you the TCM logged a more specific fault, not a diagnosis on its own. Pull the actual stored transmission code first. On these Jeeps, shift solenoids and a worn Neutral Safety Switch are the two most common causes, so rule those out before assuming the valve body is bad.
Dexron or Mercon ATF.
Change the fluid and filter at the same time, inspect the Neutral Safety Switch and solenoid wiring for corrosion, and consider a transmission cooler if converter lockup problems have been overheating the fluid.
