No it is not hard to change the speed so it will read correctly.
On the D300 you take off the speedo housing on the Xcase and replace the gear inside. The best place to find the gears is at a Jeep dealership, and they are pretty cheap. I think one can be had for about $15.
While you have everything apart, pull out your speedo cable and lube it up. Good luck.
I have the same problem on my 91 YJ. I believe it is because the stock differentials (3.07) have been replced with 4.11's. The speedometer reading needs to be taken down by 25% to get the actual speed, and 3.07/4.11 = .75
Anyway, thanks for re-posting the speedo calculator.
Does anyone know how to change the speedo on a 91 YJ?
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