- Tech Notes
Tip: Use a cordless drill with 1/2” chuck set on low speed and flood with WD-40 lubricant for a perfect bore finish
- Related Products
- General Details
Two different valve diameters are available. You will need to remove your valve body and measure the valve to select the proper kit.
For use with .420 diameter switch valves RFE-SV420-WT with tools RFE-SV420-NT no tools – refill kit For use with .453 diameter switch valves RFE-SV453-WT with tools RFE-SV453-NT no tools – refill kit
1989 and newer Chrysler vehicles equipped with A604, A606, 40TE, 41TE/S, 42LE, 62TE, 42RLE, 45RFE, 545RFE, 65RFE, 66RFE or 68RFE all utilize a solenoid switch valve and two switch valve shuttle plugs (there are three plugs in the bore however one acts only as an end plug). The shuttle plugs are prone to create bore wear and complaints and associated codes.
The purpose of the solenoid switch valve and the two independent shuttle plugs is to allow one single PWM type solenoid that is designated “Low Reverse-Converter Clutch” to perform two separate functions. When the solenoid switch valve is latched in its outboard position, the LR/CC solenoid controls the oil flow to the low and reverse brake for 1st gear. On the other hand, when the solenoid switch valve is latched in the inboard position which is 2nd gear and all ranges beyond the LR/CC solenoid now controls the converter clutch.
The first complaint occurs when contamination is present. This often causes the valve to stick in its bore resulting in limp-in mode and is accompanied by code P1776. Limp-in mode is 2nd starts with no upshift on the four speed models. Alternatively, a 1-4 shift strategy is limp-in mode on the rear wheel drive six speed models.
Overdrive clutch failure and P0871:
The second complaint with this switch valve and shuttle plug assembly is not as evident. It is the dreaded overdrive clutch pack failure that is accompanied by the trouble code P0871. The solenoid switch valve itself only strokes one time between 1st and 2nd gear. It’s in the outboard position for 1st gear and then strokes to the inboard position for the remaining forward gears. The two shuttle plugs that share one portion of the bore with the solenoid switch valve (larger end) is where the activity and wear is happening once the transmission has shifted into 2nd gear. Consequently, the shuttle plugs will wear out their independent area of the bore where they ride while the switch valve area of the bore remains in good condition.
When driving in 1st or 3rd gear, oil pressure goes between the solenoid switch valve and the most inboard shuttle-plug to keep the switch valve latched in its inboard position. However, with a compromised bore, pressure can cross leak around the inboard plug and into the overdrive clutch oil circuit, partially applying the OD clutch pack when it should be fully released. The consequences of this leak around the shuttle plug is the OD clutch will be dragging ON, which eventually leads to OD clutch friction plate failure. This leak will feed enough pressure to the OD circuit to close the OD pressure switch which should remain open until the OD clutch is commanded to apply. With the OD switch closing when it should be open, the computer trips the code P0871 (overdrive pressure switch rationality).
Features and benefits:
The TransGo switch valve kit includes a redesigned precision USA-made steel valve with a spring pocket at its inboard end. The kit also includes three oversized steel shuttle-plugs. These components restore the hydraulic circuit integrity eliminating the Overdrive clutch drag and the P0871 code. The redesigned vale helps prevent sticking. No need for expensive fixture required with the self-piloted reamer.
- O/D clutch failure
- No lock-up
- Limp-in mode
- Codes P1775, P1776, P0841, P0846, P0871, P0876 and P0988