Can someone tell me the location is of the Out Put Speed senor. The connector is on transfer case. On the opposite site of the connector ( rear side of the transfer case ) there is a access hatch. I have the feeling the sensor should be there.


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Your feeling is correct, that sensor is behind that small rear access cover. If you look at the sensor location diagram 68 in the 24P manual. It is part number 12 on page 3 of the diagram. Looks key shaped with two holes in the flat part of the sensor. That manual calls it a switch, but when you run the part number(29505601), Allison calls it a speed sensor...
Your feeling is correct, that sensor is behind that small rear access cover. If you look at the sensor location diagram 68 in the 24P manual. It is part number 12 on page 3 of the diagram. Looks key shaped with two holes in the flat part of the sensor. That manual calls it a switch, but when you run the part number(29505601), Allison calls it a speed sensor...
Would you happen to have any instructions on how to change it ? Mine is showing a p-0734 code Do you have any suggestions or thoughts .Thanks
Well that is an OBD II code, but how are you getting vehicle speed sensor from that?P0734 SymptomsCheck Engine Light will illuminateVehicle will not shift properlyDecrease in fuel economyIn unusual cases, there are no adverse conditions noticed by the driverIn some cases, there may be performance problems, such as dying when coming to a stop after driving on the freeway and/or misfire-like symptomsCommon Problems That Trigger the P0734 CodeDefective 4th gear related shift solenoidDefective 4th gear related gear set or clutch packDefective Engine Coolant Temperature SensorDefective Valve BodyDirty transmission fluid that restricts the hydraulic passagesCommon MisdiagnosesEngine Misfire problemInternal Transmission problemDriveline problem
Well that is an OBD II code, but how are you getting vehicle speed sensor from that?P0734 SymptomsCheck Engine Light will illuminateVehicle will not shift properlyDecrease in fuel economyIn unusual cases, there are no adverse conditions noticed by the driverIn some cases, there may be performance problems, such as dying when coming to a stop after driving on the freeway and/or misfire-like symptomsCommon Problems That Trigger the P0734 CodeDefective 4th gear related shift solenoidDefective 4th gear related gear set or clutch packDefective Engine Coolant Temperature SensorDefective Valve BodyDirty transmission fluid that restricts the hydraulic passagesCommon MisdiagnosesEngine Misfire problemInternal Transmission problemDriveline problem


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Found this on the internet .The vehicle"s Engine Control Module (ECM), Transmission Control Module (TCM), or PCM, depending on the vehicle make and model, uses information from the transmission speed sensor, calculated against engine speed, to determine the proper gear ratio. And when this data does not match up, a P0734 trouble code is stored. I had the fluid and filter changed at a Cat dealer here in Vegas . Drove it 6 miles and fluid was leaking all over the ground coming out of the vent on top of the transmission . Took it back twice they removed about a gallon of fluid . Last time coming home check transmission light came on the number 5 indicated on the display on the left side only and stayed in 5th gear . Cool down overnight check the level this morning still seems to be high . ( before this ) Also coming up to a stop sign it seemed to go into neutral a couple of times and then into second . So I actually had two codes p 0734 and the other one was p0796 . It is going back to Cat on Monday to see what they can find out . Truck is a M1078a1r 2007 with 4400 miles on it . Just drove from Pennsylvania to Vegas 2500 miles no problems . Thanks for your input (This morning it seemed to shift just like normal ?)