The Popular AW4 Automatic Transmission And Common Problems Associated With It Posted by on Tuesday, May 28th, 2013 The AW4 automatic transmission was designed jointly by AMC and Jeep. It was actually produced by Aisin-Warner. It has four forward speeds and shares many common parts with transmission. It first went into production in 1987 and lasted until the end of the 2001 model year.

• Aw4 Transmission For Sale

It was used in many popular Jeep vehicles, including the Jeep Cherokee. One thing to note when swapping out the AW4 transmission is that it came with two different input splines; early units used a 21 spline shaft and later ones used a 23 spline shaft. Customers that own Jeeps seem to keep them forever, so you are likely to see one roll through your shop every now and then. Here are a couple of common problems associated with the AW4 transmission. Source: makcotransmissionparts.com Problems associated with one of the solenoids: This transmission has a number of different solenoids. The solenoids are used to control certain functions within the transmission electronically, such as moving a valve in the valve body.

The main component in the solenoid is a coil of wire that when energized, creates a magnetic field. It is this coil of wire that will give you the most problems. It is not uncommon, especially in high mileage vehicles, to have this wire either break or internally short out. The quickest and easiest way to check a solenoid is to use an ohm meter.

A properly working solenoid will usually return a reading of 20 – 30 ohms. Any reading outside this range may indicate a bad sensor. Problems associated with over heating:. It was originally designed to operate at a maximum temperature of around 200 degrees. Here is a good fact to know; for every 20 degrees you go above 200 you cut the life of the transmission by a factor of two.

At that rate it won’t take long to fry the transmission. I would do a couple of things to control the heat. First, install the largest cooler that will fit the vehicle. Next, talk the customer into investing in a deep sump aluminum pan. Make sure the pan is aluminum and not steel (aluminum dissipates heat better). Finally, convince them to convert over to synthetic fluid. Synthetic fluids behave much better under higher temperatures than conventional fluids do.

Title: Jeep AW4 Transmission ATSG Service Manual, Author: Memo Nunez, Name: Jeep AW4 Transmission ATSG Service Manual, Length: 112 pages, Page: 1,.

Source: jeepcommander.com If your customer’s AW4 has made it last shift, I strongly recommend you replace it with a re-manufactured transmission over one that has been simply rebuilt. I made this recommendation for two good reasons. First, is going to include upgrades and modifications designed to make them last longer. A rebuilt transmission will not. Second, a re-manufactured transmission will include a. Usually three years compared to an average 90 days for a rebuilt transmission. And get this – if the re-manufactured transmission fails within the warranty period that will also cover your R&R cost to replace your customers transmissions.

Aw4 Transmission For Sale

That could save your shop a lot of money in the long run.