Get the correct speedo gear. I got mine from Livernois for like $20. I don't know what teeth you need for the 3.73's. But all you have to do is pull the cable from the tranny, pull the clip off, change the gears, put the clip back on, and put your cable back in the tranny.
***Did some checking, it is a 20-22 tooth gear you need, depending on your tire size.
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