94 Ranger - Speedo Gear

[koldstart]

I've done a little bit of digging, but I'm a bit confused on how to recalibrate my speedometer.

I had 3.27's and I went to 3.73's. Can I , or do I , Just go to the junkyard and pull a speedo gear off a explorer / ranger that had 3.73's? I'm not sure If i understand why some would have a different number of teeth..etc. I haven't pulled mine out yet, but I'd just assume that if it comes out of a 3.73 geared truck.. it should work? Does it matter if it is out of 4x4 4x2? (mine is 4x4, gear in transfer case)

Thanks!

 

[general x]

Assuming the trans in the doner ranger has the same gear ratio's (I don't know if multiple ratio options were availible) that would probably work. A 3.73 ranger would have a different speedo gear from a 3.27 ranger because the transmission output would have to turn faster on the 3.73 ranger to reach a given speed. The different speedo gear allows the speedometer to display the same road speed in different equipped vehicles.

http://www.therangerstation.com/tech_library/Speedogear.html is a very handy guide, especially for the part numbers. I just bought a new speedo gear for my explorer and Ford wanted to charge me for the whole bit that goes into the transfercase (80 bucks) I provided the part number and bought a 10 dollar gear instead

 

[koldstart]

Fantastic. Thanks for the help!