Test Procedure

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

All pressure readings should be taken with the transmission fluid level full, transmission oil at the normal operating temperature, and the engine at 1500 RPM. Check the transmission for proper operation in each gear position that is in question or if a specific element is in question, check the pressure readings in at least two gear positions that employ that element. Refer to SCHEMATICS AND DIAGRAMS to determine the correct pressures for each element in a given gear position.

NOTE:

The 66RFE utilizes closed loop control of pump line pressure. The pressure readings may vary greatly, therefore you should always follow the desired line pressure.

Some common pressures that can be measured to evaluate pump and clutch performance are the upshift/downshift pressures, garage shift pressures, and TCC pressure. The upshift/downshift pressure for all shifts are shown in UPSHIFT PRESSURES and DOWNSHIFT PRESSURES . In-gear maximum pressure for each gear position is shown in IN-GEAR PRESSURES .

UPSHIFT PRESSURES

66RFE
ENGINE	1-2	2-3	2prime-3	3-4	2prime-4	2-5	3-5	4-5
5.7L	150	125	125	135	135	135	135	135
68RFE
ENGINE	1-2	2-3	3-4	4-5	5-6	2-4	3-5	4-6
6.7L	160	150	150	160	160	150	150	160

DOWNSHIFT PRESSURES

66RFE
ENGINE	5-4	5-3		5-2	4-3	4-2prime	3-2	3-2prime	2prime-1	2-1
5.7L	135	135		135	135	135	135	135	135	135
68RFE
ENGINE	6-5	6-4	5-4	5-3	4-3	4-2	3-2	3-1	2-1	-
6.7L	150	150	150	160	150	160	150	160	160	-

IN-GEAR PRESSURES

66RFE
ENGINE	1	2	2prime	3	4	5	NEUTRAL	REVERSE
5.7L	160	135	135	135	135	135	120	250
68RFE
ENGINE	1	2	3	4	5	6	NEUTRAL	REVERSE
6.7L	160	150	150	160	160	160	125	250

Actual line-pressure while in-gear will vary based upon minimum learned line-pressure. Minimum line-pressure starts at 40 psi and learns up to the minimum pressure to hold the clutches in an applied state.