Ford Explorer: Explorer Speedo Calibration

Up through the '97 model year, you can recalibrate your speedometer by
replacing the vehicle speed sensor (VSS) gear. If you have a 2WD, then your
VSS is in the tailshaft of your transmission. If you have a 4WD, then it is
in the transfer case. In either case, it is just in front of where the rear
driveshaft enters. The VSS is held on by one bolt and has a two-wire
connector plugged in to it. Mine is a blue, aluminum looking color but that
may not be the case for all. Remove the VSS and at the end is the gear you
need to replace. You dont' say at what speed you are off by 3-5 MPH, but you
probably only need to go up by one tooth. Count the teeth on your current
gear, and then get an identical one with one more tooth. For each change in
one tooth, you will change your speedometer/odometer by approximately 5%. If
you put a larger gear in, your speed will go down, a smaller gear will make
your speed read higher. The last gear I bougt in March ran about $10 at
Ford.

The part number I needed for my '97 5-speed auto that originally came with
4.10 axle and 255 70R16 tires was C0DZ-B. It is the 19 tooth pink one. My
original gear was the 20 tooth black one. One less tooth was all I needed. I
used this formula: New Teeth = (Current Teeth x Speedo Reading)/Actual
Speed. Be aware though that the table came from a Ford Ranger site.
Unfortunately I don't have the link anymore so I don't know whom to give
credit. The gear I used says that it goes on a manual transmission. When the
parts lady first brought out the 19 tooth gear for the automatic, it was too
big. Fortunately I took the gear out and brought it with me to compare (boy
did it shift funny without the gear!). Here is the table that I used:

Manual Transmissions and all 4x4s:

16 tooth wine(C0DZ-A)
17 tooth white(C3DZ-C)
18 tooth yellow(C0DD-B)
19 tooth pink(C0DZ-B)
20 tooth black(C1DZ-A)
21 tooth red(C4OZ-A)

2WD Automatic Transmissions:

16 tooth blue(D0AZ-A)
17 tooth green(C7SZ-A)
18 tooth gray(C7SZ-B)
19 tooth tan(C7VY-A)
20 tooth orange(C8SZ-B)
21 tooth purple(D0OZ-B)

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"gordo" <welcome> wrote in message
news:XMCib.47855$news.atl.earthlink.net... 
noticed that the 
purchased tires 
have checked out 
an OBDII scanner 
Should I take 
speedometer calibrated 
must be be