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There is an ABS wheel speed sensor located in the rear differential.
If this fails it affects the ABS and may cause your speedometer to read erroneously at speeds under 25-30 mph. There is also a VSS located in automatic transmission housing. Manual trans vehicles don't have this. They use engine rpm to determine speed as there is supposedly no slippage in the manual drive train.
Not sure what you mean by rpm sensor. The signal for the tachometer comes from the PCM and is based on signals from the crankshaft position sensor, located on the right rear of the engine where the transmission bolts to the engine, but if this is bad, there are a lot more problems than the tachometer not working. There are two speed sensors on automatic transmissions, an input speed sensor and an output speed sensor. Both are located on the left side of the transmission, the input speed sensor near the front (just behind the bell shaped portion) and the output speed sensor near the rear. In addition to those there are wheel speed sensors for the ABS, located in each wheel area covered by the ABS.
i believe it has a vehicle speed sensor in the rear diff that is probably your problem as the sensor you replaced in the transmission was probably the output shaft speed sensor
Is the 1-2 shift high also? When you had the valve body off did you check the screens on the governor solenoid and the 3-4 shift solenoid? These tend to plug up.
Your car is in "limp"mode because the computer doesn't know what speed your doing,So it doesn't shift, There are three possible reasons for this, #1= input sensor faulty on transmission, #2=output sensor faulty on transmission, #3=speed sensor faulty on transmission, you need to have the transmission codes read to know which one,Autozone checks codes for free.
Just ask for the 3,4 shift solenoid, in which case the transmission pan has to be taken off, the filter, and possibly the valve body to get at the solenoid, I don't have my manual right now, so I can't tell you which solenoid it is.
The speed sensor is usually screwed into the side of the tranny near the back end of it, don't confuse it with the back up light switch, that's screwed in somewhere in the center of the tranny. Hope this helped a little. Good Luck.
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