PTFE Seal Install Tips for Sonnax 2nd Gear Super Hold Servo

Since Sonnax product support is often asked this question, I'd like to share a few tips on installing PTFE seals on Sonnax 2nd Gear super hold servo kit 22301B-01K for Chrysler 46RH, 46RE, 47RH, 47RE, 48RE, A727 transmissions.

Non-scarf cut PTFE seals can be very intimidating to install for the first time, quite different from installing your average rubber O-ring. The main tool you are going to need with these is patience. Slow and easy will get you where you need to be.

Take the seal between your thumb and pointer finger, while pulling, work seal around to stretch evenly (Figure 1). Fit one edge of seal in the servo groove and install it all the way around. If it is still too snug to fit, you may have to repeat the previous stretching process until you can slide the seal the rest of the way over the end of the servo.

Figure 1 – Stretching Seal

Once the seal is in the groove, you can roll the part in your hands to help shrink the seal deeper into the groove. You will then take the sleeve, making sure it is square, and gently work it over the seal (Figure 2).

Figure 2 – Fitting Seal

If you are still having difficulty, another option is to tightly wrap the seal with electrical tape and let it sit for several minutes (Figure 3). This will size the solid PTFE seal down. This method can be used on any other seals of this type when a dedicated sizing tool is not available. These seals are very strong and can stretch quite a bit before you break them.

Figure 3 – Still Having Difficulty? Size Seal with Electrical Tape