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2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Output Speed Sensor Location

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  #1  
Old 05-12-2008, 08:33 PM
MagnumVP MagnumVP is offline
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Default Output Speed Sensor Location

Recieved a P0720 from the machine and need to replace the Output Low Speed Sensor. However I have the service manual and the Heynes Manual but can't make heads or tails of the location of it. Both the Haynes and the ServiceManual have the exact same picture. Any help would be appreciative.
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Old 05-12-2008, 08:38 PM
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Default RE: Output Speed Sensor Location

There's a speed sensor on the top of the rear differential, isthat the one your looking for?

I believe there's also one in the tranny but I am unsure whether or not you would need to pull the pan to get at it.
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Old 05-12-2008, 08:57 PM
MagnumVP MagnumVP is offline
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Default RE: Output Speed Sensor Location

Well I purchased the Output Speed Sensor from AutoZone (Part Number SU394) but I think this is incorrect part. I need to replace the Output Speed Sensor for the tranny (Pulling from error code P0720). But I think that is the incorrect part. I can't find that part anywhere under the truck or on the tranny.
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  #4  
Old 05-12-2008, 09:41 PM
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Default RE: Output Speed Sensor Location

The speed sensor is located in the overdrive gear case. The sensor is positioned over the park gear and monitors transmission output shaft rotating speed

[IMG]local://upfiles/2784/7F4B321A1DD24BA8A07FAA160FF1D816.gif[/IMG]
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Old 05-12-2008, 10:21 PM
MagnumVP MagnumVP is offline
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Default RE: Output Speed Sensor Location

Well that was it. I replaced the sensor, erased thecodeand the problem is now gone. Thank You
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Old 05-25-2008, 10:07 PM
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Default RE: Output Speed Sensor Location

hi there i am having the same error code on my truck. The check engine light came on the other day and the truck was acting weird so i had the code pulled today and it is p0720. the symptoms i have notcied are when im at a complete stop and the vec. is in gear (drive, reverse) the speedo reads twenty ish km. When im coming to a stop the spedo will drop down to zero but once i've reached a full stop it bounces back to twenty, when i start to accelerate from a stop the speedo instantly drops to zero and goes up as i increase speed, seems to be working properly. If I put the truck in park the speedo drops to zero but if i depress the bake pedle while in park it sits at about twenty again. The other symptom is if I have my foot on the brake and im at a stop and I shift into neutral i can hear a clicking noise (and kinda feal it in the pedle) it clicks about 10 times then stops, once i shift back into drive it does the same thing, about ten clicks. The truck also seems to be late shifting. I do not have abs in this truck. Any suggestions would be great, is there any way to acutaly test the output speed sensor? How about the entire circuit? The clicking noise makes me think possibly a solenoid if there is one in the circuit. thanks in advance -dan
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Old 05-25-2008, 10:08 PM
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Default RE: Output Speed Sensor Location

sorry forgot to mention the truck is a 1999 dodge ram 1500 Laramie slt 4x4 with a 5.9l engine, no abs. thanks again -dan
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  #8  
Old 05-26-2008, 12:10 PM
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Default RE: Output Speed Sensor Location

Well the P0720 Error Speed Sensor is only $20 and it takes about 3 minutes to replace with a standard cresent wrench. Is that the only code that the computer is spitting out for you. Not sure if you have a Kragen near you but here is the piece that I fixed to fixed my P0720 error. http://www.partsamerica.com/ProductD...79&PTSet=A

That part is assuming that you have the same tranny as I do (46RE)

At one time I had a similar issue where my speedometer wouldn't register until 15-20 MPH and it turned out to be the vehicle speed sensor on top of the rear differential. It is about $45 and takes a 1/2 socket and about a 5 minutes to replace. However at that time, my check engine light was NOT on (my ABS light was).

I have ABS in my truck but here is the sensor for a NON-ABS truck.
http://www.partsamerica.com/ProductD...79&PTSet=A

Have you checked the fluid level in yout tranny? When was the last time you changed the fluid and filter?
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  #9  
Old 11-14-2009, 05:20 PM
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Quote:
Originally Posted by Parts/Service View Post
The speed sensor is located in the overdrive gear case. The sensor is positioned over the park gear and monitors transmission output shaft rotating speed

[IMG]local://upfiles/2784/7F4B321A1DD24BA8A07FAA160FF1D816.gif[/IMG]
Is it possable for somebode to post a pict??
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  #10  
Old 06-09-2010, 08:03 PM
DanDMan DanDMan is offline
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Default Output speed sensoe location

This is a 1999 Dodge Ram 1500 5.2L V8

This is the sensor in the rear, but its not the output speed sensor.Click the image to open in full size.

On the transmission next to the U-joint/drive shaft is the output speed sensor. Is is located on the drivers side facing down. The Wires to this device as listed in the manual are LightGreen/Black stripe & DarlBlue/Black stripe.

Click the image to open in full size.
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  #11  
Old 06-09-2010, 08:12 PM
DanDMan DanDMan is offline
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Just to host the images onsite here are the pics again:
Attached Images
File Type: jpg RearSensor.jpg (42.7 KB, 387 views)
File Type: jpg OutputSpeedSensor.jpg (38.4 KB, 462 views)
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  #12  
Old 06-30-2010, 01:04 PM
dpixley dpixley is offline
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Default '98 5.2 4x4

Would the ourput speed senor be located in the same place on a '98? Local shop wants $72.86 for the part and 69.97 for labor, total $142.83. Trying to save a few bucks.

Thanks for any help. The pics are great.

Don
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Old 06-30-2010, 01:27 PM
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I think on the 98's, the VSS is the sensor mounted on the rear axle. One or two bolts, and a wiring harness connector. Can change it in your driveway in less than ten minutes.
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  #14  
Old 06-30-2010, 03:50 PM
dpixley dpixley is offline
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Default Output Speed Sensor

I've replaced the sensor on the rear differential. I need to replace the output speed sensor on the transmission. Need to know where it's located. Thanks.
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Old 06-30-2010, 06:35 PM
dpixley dpixley is offline
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Default Output speed sensor

Found it. How much tranny fluid will come out when I take out the sensor? Thanks.
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  #16  
Old 07-06-2010, 03:29 AM
ssnoogins187 ssnoogins187 is offline
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i have a 1998 dodge ram 1500 4x4 cant find output sensor not the rear dif i need a pic if it possable NEED HELP!!!!!!!!!!!!!
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Old 07-06-2010, 08:34 AM
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98 only has one on the rear diff. They do not use one on the tailshaft.
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  #18  
Old 07-06-2010, 09:03 AM
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I'll vouch for that, I just recently went looking for mine and it's in the rear end, not on the tranny. Mine's a 98 also
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  #19  
Old 08-27-2010, 12:23 PM
red94ram red94ram is offline
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I am trying to find the output speed sensor on my 1994 1500. I found a sensor on my trans (driver's side just above the linkages) that looks similar to the part I just bought at Autozone, but it does not look exactly the same.

Here is what I bought:
Click the image to open in full size.
The sensor that I am looking at on my truck looks like I would have to drop the pan to remove it. The new one appears to be installed without removing the pan.

The plug connector on the new part looks like it would fit the plug from my truck, except one of the slots is backwards (ridge instead of a slot).

Does the pic by DanDMan apply to the 1994? I am still trying to determine if I have found the location of the output speed sensor. Thanks.
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  #20  
Old 09-09-2010, 11:12 AM
fflarry fflarry is offline
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Question help

I have a 99 dodge ram / 4x4/5.9 gas/1500
the abs light came on__ parking brake light came on /speedometer now doesn't work/won't shift into overdrive.
can anybody tell me which sensor it would be & is there a way to test senor?
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Old 09-09-2010, 11:12 AM
 
 
 
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1999, dodge, durango, error, intrepid, low, output, ram, replace, sensor, sensors, shaft, speed, transmission, vehicle

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