Budke wrote:
Your ratio is 3.73..
This is what I want to confirm but I was hoping to save myself the time of jacking up the rear end to find out. I have a sneaking suspicion that it might actually be the 4.10's in my KJ.
I mentioned in an earlier thread about my speedo being off by ~5 mph compared to my GPS. The dealer reported at the time that everything was ok. I checked the speedo again against my parents vehicles as well as those new civics with the LCD speedo displays and am still off by the ~5 mph so I took it back to the dealer and had them do a recalibration but still no change.
This has now forced me to do some investigation and when I was calculating out speed using gear ratios based off information on the internet I found that the difference between the 3.73 gear set and the 4.10 gear set at highway speeds is spot on what I am seeing.
225/75/16 /0.690 4th gear / 3.73 diff gear = 67.71 mph @ 2000 rpm (what the speedo is reporting)
225/75/16 /0.690 4th gear / 4.10 diff gear = 61.60 mph @ 2000 rpm (what the gps etc. is reporting)
That all being said, my thoughts are that the mechanic at the dealer just plugged in that the diff gear was a 3.73 when he was doing the recalibration because the Liberty comes with the 3.73 gears from factory but at some point 4.10's were installed (maybe at factory???)
So that is why I was hoping that somewhere there is a build sticker that would say what gear set is/should be in my KJ. If not then I will just have to jack up the rear end see what I find.
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