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AW4, A340 Toyota Deep Transmission Pan, In Development
PML Part Number 11076

Status: A transmission pan for the AW4, A340 is on PML's 2017 project list. We are working on a computer design, using stock parts to get the dimensions correct. Once we have a computer model, we will post an image (look for it this spring/summer).

Pricing: $250 to $300 in cast finish

Volume: Depends on clearance issues

Number of Bolts: 19

Dimensions: Not yet determined

Help us with our design and development! Please....

Thanks to those who have responded to our questions, answered our emails, and taken the survey.

Jeep stock transmission pan and dipstick receiver tube, top down view Jeep stock transmission pan and dipstick receiver tube

These are stock parts for an AW4 transmission for an 1987 to 2001 Jeep XJ. We are using these for our design and development.

If you have a transmission oil dipstick or other transmission parts from a Jeep XJ, please contact us.


These are the vehicles we know of with the AW4 or A340 transmission:

  • 1987 to 2001 Jeep Cherokee (XJ)
  • 1987 to 2000 Jeep Wagoneer
  • 1991 to 1993 Jeep Grand Cherokee (ZJ) with the 4.0L
  • 1990 to 1992 Jeep Commanche
  • 1992 to 2002 Toyota 4 Runner
  • 1992 to 2015 Toyota Pickup, Tacoma
  • 2000 to 2004 Toyota Tundra


A PML AW4 pan will have:

  • Extra capacity and fins to keep fluid cooler
  • Drain and magnetic drain plug for easy servicing
  • Boss for optional temperature sending unit
  • Heavy duty, quality sand cast aluminum contruction for strength and a leak-free seal

Design Considerations

We are considering a design that might work with multiple vehicles but our first target is Jeep XJs.

We are looking into designs with a level check/fill hole in place of the transmission oil dipstick and tube. Our goal is to keep the design and manufacturing process manageable and the price of the pan in the $250/$300 range.

This means you would no longer use your dipstick. The transmission fluid level would be checked from pan!

Jeep stock transmission pan and dipstick receiver tube

This picture shows a different transmission and vehicle but the idea would be the same.

There is a fill/level check hole on the bottom of the pan. You would need to use a pump and fill the transmission through the bottom of the pan. You would fill until the fluid starts to dribble out then put in the fill hole plug.

To check the fluid, you would remove the plug and see if any fluid dribbles out. If it does, it's full and you're good to go.

Benefits of this:

  • Current dipstick tube has so many bends that pulling out the dipstick wipes off the fluid so it's hard to get an accurate reading
  • More space available in the engine compartment

Our thanks to those who have contacted us with suggestions and information about their set-ups. We would have dropped this project long ago without constant requests. Getting measurements or checking fitment requires time and crawling around under your vehicle but this information is super important.

Transmission Info

The A340 and the AW4 are sister transmissions. The AW4 is commonly found in Jeeps, such as 1987-2001 Cherokees. The A340E, A340F, A340H transmission is found in Toyota trucks and SUVs and a few Mitsubishis and Kias.

There are 9 different stock pans. These 9 stock pans have 4 different depths and 7 different dipstick receiver heights and angles. The dipstick receivers complicate the design and manufacturing. There are 13 different filters and 15 different valve bodies in addition to 9 different pans.

Make Your Own Deep Pan

See this write-up by who welded his own extra capacity pan from two stock pans. He has some great pictures even if you do want want to make one yourself.

PML Transmission Pan Features

  • Increased oil capacity for cooler temperatures
  • Sand-cast aluminum with raised fins
  • 3/16-inch thick wall construction to add strength to the transmission case
  • 3/8-inch thick gasket flange will not bend when bolts are tightened
  • Machined gasket surface for a secure seal
  • Boss cast into pan can be machined for a temperature sensor
  • Drain hole and magnetic drain plug for easier, less messy maintenance

All PML transmission pans ship with new mounting bolts and a magnetic drain plug.

If you would like PML to machine your pan for a temperature sending unit, there is an additional charge of $40.

Find out why you should buy a PML transmission pan.

Learn more about finishes and construction of PML parts.

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