Speedo Help

mikestang63 said:

First thing is to check is what rear end gears you have. A quick way is to jack up the rear and rotate the tires one revolution and count the number of times the driveshaft turns. If it is 3:1 you have either 2.73 or 3.08. Look to see if the original tag is on the rear end cover that will tell you what gear ratio you have. If the cover looks like it was never off, then chances are you have stock gears.

Next I would check to see what speedo gear you have in the transmission. They are color coded to tell you how many teeth they have. There are different teeth speedo gears to match what rear end gear ratio you have. Also, if you have a substantially different tire size than stock that will impact your speedometer reading.

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