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If you need to test the gears on your rig, here's one way:
Get some chalk, and one person willing to give you five minutes of their time. Park the rig on a flat and preferably even surface. Use the chalk to mark the rear driveshaft with a horizonal line as close to the "middle" as possible. Mark a tire (on the same side of the XJ) with a verticle line, as close to being "straight down" as possible. Watch as your partner backs the vehicle *very slowly*. Do two things: i. watch the revolution of the driveshaft and count the passage of your line, ii. watch the mark you made on the tire. When the mark on the tire comes around to where it started, have your partner stop. They should be going slowly enough that you can do this with a fair amount of precision. Unless the gearing has been changed, it should be between 3 and 4 revolutions.
If the driveshaft revolves:
About 3 times, you're geared at 3.07.
About three and a half, 3.55.
Three and a quarter, 3.73.
an easier way to figure out the ratio without a tag or cracking the case or crawling under a moving vehicle...
chock the front wheels. put the tranny in neutral, jack up one rear tire. mark the d-shaft and rotate the raised tire two full revolutions. if it doesn't want to rotate then you have a LS and you need to raise both tires and rotate them both one revolution. then just count the rotations of the d-shaft.