Where is the speed sensor on a 98 tacoma 3.4 v6 4x4?

There are 3 of them 1 on each front wheel and 1 on the transmission .
This is the way they all work this compares wheel speed with transmission output speed in one way or an other

I guess you are talking about an after repair clear of codes to reset computer for the new vehicle speed sensor. Just use an OBD2 code reader and clear current codes drive and see if all your problems are gone. hope this helps

Which speed sensor?

On the early Tacoma, the speed sensor is located in the cluster and is driven by a cable attached to the transmission.
Later models moved the sensor to the transmission tailshaft or transfer case and eliminated the cable.
If you do not have a speedometer cable, your sensor is on the transmission.

The speed sensor is located on the outside of the transmission case, it has a wire connector going to it. There are other sensors called turbine speed sensors and they are located inside the transmission. It all depends on what problem you have.

only one speed sensor it is in the back side top of the tranny has a 10mm bolt holding it in about $44

The part number I have is W0133-1750884, this is from partstrain.com.

Here is the link if you can use it.

http://www2.partstrain.com/store/index.php?VN=4294967261+4294967152+4294967119+&Nr=AND%28universal:0%29&N=0&Ntt=Speed%20Sensor

Good luck.

check the mass air flow sensor there maybe dirt on the filiment inside the sensor causing false readings. cleaning or replacing it may make the codes go away.

REPLACEMENT

HINT: The replacement procedures for the RH side are the same as those for the LH side.

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
2. REMOVE SPEED SENSOR REAR LH
1. Disconnect the speed sensor connector.
2. Remove the nut and speed sensor rear. NOTICE:
• Do not attach any foreign matter to the sensor tip.
• Ensure that no foreign matter enters the sensor installation hole.
1. INSTALL SPEED SENSOR REAR LH
1. Install the rear speed sensor with the nut. Torque: 8.0 Nm (82 kgf-cm, 71 inch lbs.) NOTICE: Make sure that the sensor tip is clean.
2. Connect the speed sensor connector.
1. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL Torque: 3.9 Nm (40 kgf-cm, 35 inch lbs.)
2. CHECK ABS SENSOR SIGNAL

It is definitely the speed sensor assembly which hangs outside the transmission underneath the truck. Usually runs a little over $110