Aw4 Transmission

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  1. Aw4 Transmission Pan

This is a basic teardown of an AW4 Transmission also known as an A340E on a 2 wheel drive and A340F on a 4 wheel drive vehicle. The transmission override frees up the computer’s control of first and second gear in the AW4 automatic transmission found in Jeep Cherokees from 1988 to 2001 as well as the 1993 Grand Cherokee. The engineers at Aisin Warner decided that Jeep owners did not need manual control over the first two gears in their transmission.

Jeep Automatic Transmissions Available from Midwest Transmission Inc.

Running damaged or worn out Automatic Transmission is dangerous and can cost you a lot of money.

We offer a very popular line of Heavy Duty Road Runner Series Automatic Transmission and Torque Converter Packages for Jeep, 4WD applications. Hydraulic and electronic controlled units can be found. We have a large inventory of automatic transmission and transaxles ready to ship.

What causes automatic transmissions fail


Automatic transmission failure may be cause by low fluid level, or contaminated fluid brought on by heat buildup and non metal part degradation, clogging veins in the valve body, pump and torque converter. When exchanging your automatic transmission be sure to flush the actual fluid through the cooling system including lines from your transmission to the radiator and the reservoir underneath the radiator a minimum of a few times using the correct chemicals. When adding automatic transmission fluid or changing your transmission fluid verify and make certain the manufactures recommend fluid is utilized. A person can be shocked the number of times the incorrect fluid is utilized leading to an on-slot of issues.

Factory Built Ensures Consistency, Quality and Long Life

Our automatic transmission rebuild services are performed by experienced transmission discount coupon Jeep automatic transmissionstechnicians. A transmission rebuild, also known as a complete transmission overhaul, involves the complete removal and disassembly of your transmission. Each part of the transmission being rebuilt is inspected for wear and damage. Low service expectancy components will always be swapped out no matter their condition. All the other parts that don’t have brand new potential service life are replaced with the highest quality parts available. Conformity updates are installed to enhance maker’s designs to repair issues found after the vehicle leaves the factory. Our warranty is the best in the industry 100,000 miles and 3 years.

Throughout the rebuilding of your transmission all gaskets and seals are replaced with brand new ones. All new clutch fractions are part of a complete rebuild and are always replaced during a proper overhaul, including bands, electronic solenoids seals, bushings and gaskets. Valve bodies are taken apart, cleaned out, inspected and all balls and springs are replaced. Specific attention is paid to the planetary gear set, including sun gear, annulus ring gear, planet gears and planet carrier parts showing wear are replaced.

Automatic transmission rebuilt.

To ensure the greatest level of quality we utilize the best parts and torque converters obtainable along with highly trained technicians to rebuild re-manufacture your Jeep automatic transmission. We can build your automatic transmission to your specification including heavy duty towing transmissions with robust bands and clutch frictions, shift kits and external cooling systems if desired. We provide a wide variety of torque converter options, all rebuilt units are supplied with stock/OE torque converters. Optional torque converters are available, converters to satisfy your particular stall, lockup, horsepower and torque requirements. Matching your vehicles desired performance (off road or rock crawling) using the correct torque converter specification is critical. Be sure to consult our Drivetrain expert at time of the order to enable you to get the converter required. You can extend the life span of your Jeep automatic transmission by installing an auxiliary transmission cooler either under the car or truck next to the transmission or behind the grill. One other good idea if you’re towing heavy loads is to monitor the transmission by installing a temperature gauge. We advise you install the sensing unit in the output side cooling line as it leave the transmission
headed to the radiator cooling reservoir.

We offer the following Automatic Transmission Models for Jeep 42RE and 45RF. Don’t see what you need just give us a call toll free 888-824-2012.

Part NumberTrans. ModelMin YearMax YearApplicationEng. Lt.Core DepositYour Price
T4810AA42RE19961997Cherokee 4WD$$2,040.36
4003690A245E1997Cherokee 4WD4.0$$1,595.00
T4806AAAW419982001Cherokee 4WD4.0$$2,040.36
T4805AAAUTO 5 SPEED19911996Cherokee 4WD, Grand Cher4.0$$2,040.36
400298544RE1997Grand Cherokee 4WD$$1,395.00
400326744RE1998Grand Cherokee 4WD4.0$$1,395.00
400341945RFE19992000Grand Cherokee4.7$$1,642.71
T2593AA42RE20002004Grand Cherokee 4WD$$1,763.31
400467245RFE20002002Grand Cherokee 4WD4.7$$1,642.71
400408945RFE20032004Grand Cherokee4.7$$1,642.71
T6221AA4T80E20052008Grand Cherokee 4WD, Com4.7$$2,349.64
4002596A518199319Grd Cherokee 4WD$$1,450.00
400067342RE1996Grd Cherokee 4WD$$1,395.00
400450042RLE20052006Liberty 3 Plugs LH Side$$1,395.00
T2531AA90419972002Wrangler 4WD4.0$$1,422.23

Experience – Quality parts equal long life Automatic Transmissions

If you’d like assistance with your automatic transmission or having issues diagnosing the problem give the Drivetrain expert at Midwest Transmission a call 888-824-2012 we have the answers you’ll need. Don’t see what you need or want us to build your core just give us a call, you supply the core and save the core charge.

Aw4 Transmission Pan

This transmission has been remanufactured at our state of the art facility using the latest advancements in aftermarket technology. We have carefully engineered a process that allows a AW4 rebuild to maximize performance and durability while staying within a wholesale price range.

This heavy duty transmission is a direct replacement for Isuzu, and Jeep vehicles.

Transmission Name
  • AW4
  • 30-40LE
Vehicle Compatibility
  • D-Max
  • Fuego
  • Trooper
  • Cherokee
  • Comanche
  • Grand Cherokee
  • Wagoneer
Years Covered
  • 1987, 1988, 1989
  • 1990, 1991, 1992
  • 1993, 1994, 1995
  • 1996, 1997, 1998
  • 1999, 2000, 2001
  • 2002, 2003, 2004
  • 2005, 2006, 2007
  • 2008, 2009, 2010
  • 2011
New, Used, or Rebuilt
  • Performance Remanufactured

  • Ordering Info
  • Vehicle Info
  • Warranty
  • Our Process
List Price:$1,995.00Toll Free:1-888-995-PART or 1-888-995-7278
Sale Price:$1,395.00
Core Deposit:$500.00Office Hours:Monday-Friday 8:00am to 9:00pm CST.
Weekend and holiday hours vary
Delivery Shipping:Call for a Competitive Freight Quote
Core Return Shipping:Call for a Competitive Freight Quote
5 Star Product Rating
AW4 Transmission Specs and Applications
IsuzuD-MaxL4 3.0L2009-2011
FuegoL4 2.8L2000-2002
TrooperL4 2.8L2000-2004
JeepCherokeeL6 4.0L1987-2001
ComancheL6 4.0L1990-1993
Grand CherokeeL6 4.0L1991-1993
WagoneerL6 4.0L1987-1993
AW4 Info
Part Number:TAW4
Gears / Type:4 Speed Automatic Transmission
Original Manufacturer:Aisin-Warner
Group:AW4 series
4X2 or 4X4:We have 2 and 4WD models available.
Recommended Fluid:ATF
Torque Converter:We don't charge extra for necessary components. The AW4 torque converter is included with every transmission.
Upgraded AW4 parts:Yes:
Performance shift kit, valve body improver kit, and more.
Please call for extreme performance upgrades
Dyno Tested:Yes:
up to 35,000 RPM at an extended period of time.
Inspection, Checked for:Leaks
Shifting Difficulties
Excessive Noise
Temperature and Performance
AW4 Gear Ratios:

2.80 - First
1.53 - Second
1.00 - Third
0.75 - Fourth


The AW4 was co-designed with AMC and Borg Warner and built by Aisin-Warner. This transmission was manufactured in the late 80's and early 90's for Isuzu and Jeep vehicles.

Hollander Interchange Numbers:

Manufacturer part number:

FREE shipping on all covered warranties
This transmission comes with a 3 year nationwide warranty.
We cover you against any manufactured defects on this part.
We do not charge restocking or shipping fees when a transmission qualifies for a warranty. Restocking and shipping fees are applied if a customer wants to return a non defective transmission or is outside the continental United States.
Buyers warranty begins at original date of purchase and expires 3 years or 36 thousand miles thereafter.
This warranty does not cover any of the following:
Use of engine, clutches, transfer case, drive line, and/or differential for purposes for which it was not originally designed (such as off-road, race car, etc.)
Abuse, neglect, accident, or improper towing
Towing charges, vehicle rental
Loss of time, inconvenience, loss of use of vehicle, commercial loss or consequential damages
Failure because of defects or inefficiencies or parts or assemblies not furnished with the transmission (flywheel, clutch, drive shaft, etc)
Broken Gears or Shafts
Cracked or broken cases
No claims for labor or consequential damages will be accepted
We are not liable for misuse or negligence causing damage, defect, injury, or loss.
Unit must be returned for our inspection to determine fault.
Warranty Process:
In the rare case of a transmission failure please call our warranty department where a representative will assist you in the warranty process. Call Monday-Friday 9-5 Central 1-888-995-7278

Every transmission has been run on a state of the art Dyno. A Dyno simulates the conditions encountered by a transmission during every day and extreme use. This ensures that when your part arrives, it will have been rigorously tested for noises, leaks, vibrations and performance. Any part that does not meet our strict guidelines will be completely disassembled and gone through until our quality requirements have been restored.
OEM stands for Original Equipment Manufacturer. Our parts meet or exceed the guidelines set forth by the manufacturer.
Some transmissions have inherent factory flaws causing them to chronically break down. Through years of experience we have developed several procedures to help fix these problems.
Every remanufactured transmission has been built and inspected by a certified technician. Our technicians have an average experience of 10 years or more.
New Parts
All wearable parts are replaced, this includes: seals, bearings, synchronizers, rings, bushings, bands, gaskets, keys, and much more.
The final process before shipment is a complete inspection of the entire unit. During our inspection process, even the smallest of inconsistencies are addressed.

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