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You need to check the out put speed sensor (OSS). This is a 2 wire magnetic pick up sensor and is used to measure output speed shaft. This is used to determine proper govenor PSI. This sensor is prone to internal failure and loose ground connection. Here are the location the output is located on the left rear trans. On 4X4 it will be before transfercase. Also If you change ECM put the old one back they have a security vin installed and it will need to be flashed plus it wont match and youll get weird drivability results. Let me know we can fix this together.
Aluminum metal shavings are very normal for this transmission if the pan has never been off.What do you mean by "clutch band".This unit has 4 sets of clutches 2 bands and 2 rollers clutches.I would suspect a bad govenor pressure sensor and or solenoid by the symptoms you describe.With a scan tool you can look at govenor pressure(actual)and desired govenor pressure.Govenor pressure should be at 0 sitting still and should increase with road speed( example 22 mph=22psi). Let me know if I can help.
there are only two and i always replace both @ same time remove trans pan and you will see them on passenger side of valve body there is a little bracket with bolt that holds in place remove and disconnect connector and slide out generally it is the govenor pressure sensor that causes problem where truck takes off in second gear
possible speed sensor at rear of transmission,does engine rpm sound higher then narmal,and is your trans shifting as it should,if these problems are also present replace the speedometer sensor at rear of trans,$50 to 60 bucks
ABS LIGHT ON AS WELL?IF SO..I WOULD LOOK AT ABS SENSOR IN REAR DIFFERENTIAL..GETS SPEED SIGNAL FROM THIS SENSOR AS WELL..USES ONE IN TRANS FOR TRANS SHIFTING
I have a 1999 Ram B 1500 Van, auto transmission, 5.9 L engine.
Same problem, trans hesitates in 2-3 upshift, sometimes 1-2
to 2-3 upshift. Posts trouble code P1756 - Transmission Govenor pressure too low at below 15 to 20 Psi. Transmission pump shot or valve body leak stops trans from reaching proper pressure to shift, which is minimum 15 Psi.
Either trans is leaking in valve body, valve is stuck, shift solenoid on valve body is sticking, or pump is shot.
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