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Rossco I remember a while ago us trying to sort out a speed correction for the GQs. I actually just check with Patrolapart and got this response from Aaron. I got quoted $75 for the part needed, part number 3270331G16 for a 16 tooth.
"As for the speedo, you can change the gear on the end of the speedo drive in the transfer case.
Just slip yours out, count the teeth, then buy the tooth count that will change it approx. 20% which should be 2 teeth different to what you have."