Before or after overhaul, Dodge trucks equipped with the AS68RC may exhibit a complaint of diagnostic trouble codes relat-ed to pressure switches num-bered 7, 1 and 2, which were just replaced. This problem has shown up on the 1/4 NPT switch-es only at the time of this printing.
The cause may be that the 1/4 NPT pressure switch that was replaced is not functioning con-sistently. ATSG has had reports of new 1/4 NPT switches not functioning until the switch is fed 150 psi. After that the switch performs correctly, closing at 65-70 psi consistently.
To correct this condition, apply 150 psi of air pressure to the opening at the bottom of the switch and verify that the switch closes consistently at 65-70 psi after that. Refer to Figure 1 for location and testing for the 1/4” NPT pressure switches. Note: Returning the switch to the suppli-er will only prolong the process of getting the problem resolved.
1/4” NPT PRESSURE SWITCH
A 2007 or later-model Dodge Ram equipped with the 6.7 Liter Turbo Diesel and the AS68RC six-speed transmission may set diagnostic trouble codes P0706 “Transmission Range Sensor Circuit
Range/Performance” or a P2806 “ Transmission Range Sensor Alignment.”
The Shift Quadrant Indicator Lamps are all illumi-nated; the transmission also has harsh engagements both forward and reverse.
The tan 10-pin Transmission Range Sensor con-nector and the black 10-pin Solenoid Connector have been cross connected (Figure 2). It is actually easier to connect them incorrectly due to harness routing.
Be sure to connect the tan 10-pin connector to the Transmission Range Sensor. The black 10-pin sole-noid connector is located directly behind the Transmission Range Sensor connector.
Vehicles equipped with the 6R60/75/80 may exhibit a complaint of a delayed engagement into reverse and/or a flared shift into 3rd gear. This complaint is typically more consistent as fluid temperature is increased.
The cause may be that the B clutch housing is leak-ing in the sealing ring area as the C/D housing/support is worn where the B clutch shaft is supported. See Figure 3 for an application chart and note that the B clutch is used in reverse, 3rd and 5th gear. This com-plaint also may vary, as wear in this area will increase over time.
Refer to Figure 4 for a component location of the B clutch housing and the C/D housing/support. Notice the raised area in the rear of the C/D housing/support. This is the area that acts as a bushing for the B clutch shaft/housing as it connects to the front sun gear in the rear planetary assembly.
To correct this condition, replace the C/D housing/support. At the time of this printing there are no aftermarket machining processes to install a bushing into this area. Refer to service information and note that there are numerous part numbers for this support, consult a Ford dealer with the VIN number to verify the correct part number for your application.
C AND D SUPPORT (Ford Part Number)……………………………..6L2Z-7A130-A
C AND D SUPPORT (Ford Part Number)……………………………..8L2Z-7A130-A
C AND D SUPPORT (Ford Part Number)……………………………..9L3Z-7A130-B
C AND D SUPPORT (2011 up models Ford Part Number)……..BL3Z-7A130-A
Note: Ford calls this part a bracket. Verify part
number with VIN of vehicle.
Vehicles equipped with the 6R60/75/80 may exhibit a complaint of a flared shift into fourth gear when hot, and/or a slipping condition in fourth, fifth or sixth gears. This complaint is typically more consistent as fluid temperature is increased. There may or not be trouble codes related to the complaint. Common DTC’s include P0734 gear ratio error in fourth, P0735 gear ratio error in fifth, gear ratio error in sixth P0736, and P0766 D Solenoid performance and P07AA E Clutch stuck off.
The cause is commonly between two areas:
- The E clutch drum may be cracked around the weld area in the rear of the drum causing a leak in the E Clutch causing the clutches to fail. See Figure 5 for a component application chart showing the elements applied in 4th-6th. The common Clutch is the E or Overdrive Clutch.
- The rear stator bushing is worn, as shown in
Figure 7. This bushing provides a sealing surface for the E Clutch apply circuit, as there is only one sealing ring in front of the feed hole. See Figure 6 for the sealing ring location on turbine shaft.
To correct this problem:
- Refer to Figure 6 and verify if the E Clutch drum is cracked by wet air testing. If the drum is cracked, refer to service information for part number identification for the model year you are working on.
- If rear stator bushing is worn, as shown in Figure 7, it will need to be replaced. At the time of this printing, bushings are available from Eriksson Industries and Omega Machine and Tool.
E CLUTCH DRUM 05 MODEL Early
(Ford Part Number)………………………. 5L7Z-7F207-A
E CLUTCH DRUM July 19/2005 6R60 AND 6R80
(Ford Part Number)………………………..BL3Z-7F207-B
Note: There is also a 6L2Z-7F207-AA which was replaced with the BL3Z-7F207-B for the later application listed above.
April 2019 Issue
Volume 36, No. 4
- Dodge AS68RC: Pressure Switch Fault After Replacement
- Dodge AS68RC: Transmission Range Sensor Codes After Repairs
- Ford 6R60/75/80: Delay Reverse and/or 2-3 Flare
- Ford 6R60/75/80: Flared Shift Into 4th/5th/6th Hot