After installation of the transmission, shortly after the vehicle is started the MIL is illuminated and code retrieval produces codes P0715, P0717 and/or P0718.
An incorrect combination of turbine-speed sensor and driven sprocket was used.
The AX4S and AX4N/4F50N use two different turbine-speed sensors of different lengths (Figure 1).
The driven sprockets for both are the same but the TSS reluctor is pressed into the sprocket at two different depths (Figure 2).
The correct air gap between the TSS and the reluctor is 0.120 inch. If an AX4S TSS is used with an AX4N/4F50N driven sprocket, the reluctor will make contact with the TSS and destroy it. If an AX4N/4F50N TSS is used with an AX4S drive sprocket, the air gap will be too great.
To ensure that the correct combination of parts is used, put the channel plate in place and measure the depth of the TSS hole to the reluctor (Figure 3). If the measurement is 0.687-0.709 inch an AX4N/4F50N TSS must be used. If the measurement is 0.759-0.772 inch an AX4S TSS must be used.
Note: If a 4F50N has an incorrect driven sprocket installed, an AX4S/N TSS connector can be spliced in to avoid transmission removal.
- AX4S turbine-speed sensor . . . . . . . .F1DZ-7M101-A
- AX4S TSS connector . . . . . . . . . . . . . . .3U2Z-14S411-VBA
- AX4N/4F50N turbine-speed sensor . . . . . . . .F5DZ-7M101-A
A vehicle is towed to the shop with a complaint of no reverse, third or fifth gear and the MIL illuminated. Code retrieval produces codes P0733 for a gear-ratio error in third gear, P0735 for a gear-ratio error in fifth gear and a P0756 for shift solenoid B stuck off.
The weld holding the sun gear to the shell has broken (Figure 4).
Replace the sun gear shell with the updated assembly (Figure 5), using the part number provided under “Service information.” The No. 3 thrust bearing will be pack-aged with the sun-gear shell.
- Sun-gear-shell assembly & No. 3 thrust bearing . . .7T4Z-7A019-A
After transmission work has been performed, the vehicle has a slipping condition during turns.
An incorrect combination of pan and filter was used.
The 4F27E/FN4A-EL sump pan and filter are different from those of the FNR5/FS5A-EL. The 4F27E/FN4A-EL pan in Figure 6 is the shallow pan and has no drain plug.
The sump filter that is compatible with this pan, also in Figure 7, has the short pickup spout.
The FNR5/FS5A-EL pan in Figure 7 is the deep pan and has a drain plug. The sump filter that is compatible with this pan, also in Figure 6, has the long pickup spout. This pan also has brackets in the bottom. The pickup tubes on both filters are the same, making it easy to switch them.
The 4T65-E upper and lower channel-plate gaskets, previously paper gaskets, are now rubber-coated metal gaskets.
To prevent gasket blowout due to imperfections in the transmission case and channel-plate-gasket sealing surfaces (Figure 8).
The upper and lower channel-plate gaskets.
The rubber-coated metal channel-plate gaskets (Figure 9) will back-service all 4T65-E transmissions.
The rubber-coated metal channel-plate gaskets will be included in most aftermarket overhaul kits once the stock of kits with paper gaskets is depleted.
A vehicle equipped with the 6T70/75 may come in with a complaint of no reverse engagement and no third or fifth gear or slipping badly in third and fifth gears. The SES lamp is illuminated and code P0776 for pressure-control solenoid B stuck off is retrieved.
In addition, any one of the following codes may also be stored:
- P0716 – Input speed sensor circuit range/performance
- P0717 – Input speed sensor – no signal
- P0777 – Pressure-control solenoid B stuck on
- P2714 – Pressure-control solenoid D performance or stuck off
- P2715 – Pressure-control solenoid D stuck on
- P2723 – Pressure-control solenoid E performance or stuck off
Upon disassembly of the transmission several damaged parts are found, including but not limited to the 3-5-Reverse drum and piston return-spring assembly and the transmission end cover (figures 10, 11, and 12).
The 3-5-Reverse wave plate has broken, allowing the piston to over-stroke.
Replace the damaged parts, using the part numbers shown under “Service information.”
- 3-5-Reverse waved cushion plate. . . . . . . . . . . . . 24254103
- 3-5-Reverse clutch drum . . . . . . . . . . . . . . . . . 24223798
- 3-5-Reverse clutch piston return-spring assembly . . . . 24243887
- Transmission end cover . . . . . . . . . . . . . . . . . . 24241083
January 2013 Issue
Volume 30, No. 1
- Ford AX4S/AX4N/4F50N: differences in turbine-shaft speed sensor
- Ford 6F50: no reverse, 3rd or 5th gear
- Ford 4F27E/FNR5, Mazda FN4A-EL/FS5A-EL: sump-filter & pan compatibility
- GM 4T65-E: aftermarket channel-plate gaskets
- GM 6T70/75: no reverse, 3rd or 5th gear