Heavy Metal! - May - 2020

Intro to the AS69RC

Let’s talk about the AS69RC, which is in the family of the AS68RC. There are many existing differences among the two transmissions. The AS68RC has a totally different valve body than the AS69RC and the ratios differ as well. The AS69RC is just as heavy as the AS68RC but much easier to work on, take apart and assemble.

Figure 1 compares the gear ratios with the 545RFE, 65RFE, the AS68RC, 69RC, 66RC as well.

In 2007, Chrysler Corp decided to start using the AS68RC on their diesel-powered trucks with the 6.7 turbo diesel engines and it was rated at 750lb of torque capacity. Some transmissions had PTO capabilities, and some did not. Depending on the application, the torque converter locked up whenever the PTO was in use. In 2013, the Ram Corp switched to the AS69RC, which is known to be a stronger and more durable transmission for heavy-duty applications.

The unit consists of three planetary gear sets and one overrunning clutch, as well as complete electronic functionality of the transmission (figure 2). The cavities for component air checks on the bench are shown in figure 3.

These solenoids, like the Ford 6R140 or Torqshift 6 as Ford calls it, are flow rated and are computer modulated to control the shift timing and clutch application (figure 4). I would like to emphasize you SHOULD NOT interchange solenoid locations, this action will result in harsh upshifts or harsh downshifts.

The green painted bolts are the ones that you need to remove only for a valve body removal. If you are going to remove the solenoids, after you remove the long hold down bracket, be very aware of the pins that hold the solenoids in place (Figure 5).They keep the solenoids from rotating, they will fall out on their own. If they fall out and you can’t find them, this is going to delay your build.

The correct color routing of the wires is as follows;

  • Brown/Red Wire to Linear Solenoid 5.
  • Light Green/Yellow Wire to the Linear Solenoid 4.
  • Sky Blue/Green Wire to the Linear Solenoid 3.
  • Yellow/White Wire to the Linear Solenoid 1.
  • Connect the Brown/Red Wire to the Linear Solenoid 2.
  • Black/Blue Wire to the On/Off solenoid.
  • Connect the Blue/Gray Wire to the Linear Solenoid SLU.
  • Connect the Purple/Black Wire to the Linear Solenoid SLT.

We highly recommend keeping this information archived for future reference.

As you can see in figure 6, all solenoids are not the same. The small pulse width modulated yellow connector solenoids measures 4-6 ohms.

The larger black connectors pulse width modulated solenoids will measure 4-6 ohms as well, while the green connector solenoid is an ON-OFF type solenoid, will measure at 11-21 ohms.

The transmission TOT sensor chart is illustrated on figure 7.

The solenoids have different numbers engraved on them; this is for identification purposes. These are the part numbers to each one of the solenoids.

Swapping the large solenoids in the valve body, or the SLT with the SLU solenoid, could result in bind ups, flairs or possible harsh downshifts. This unit, like the AS68RC, also suffers from internal wiring issues. The wires will get brittle with the heat and fry or the wires may come loose from the terminal end. We have seen cases where they have even broken apart.

When viewed from below the vehicle, all solenoid connectors will always face down to the oil pan. When viewed from above, like when the valve body is on the bench, all solenoid connectors will always face up.

Figure 8 illustrates the small parts in the valve body which, in comparison to its predecessor and other units, is a pretty simple layout.

Ok, in this article we’ve given you an overview of the AS69RC as well as some specifications and problems you might run into. This article will help you get these units fixed quickly as you start to see them rolling into your shop. Until next time!