Gearing: Any reason to think... -
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post #1 of 8 Old 01-09-2008, 09:31 AM Thread Starter
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Gearing: Any reason to think...

...that I have a rear gearing other than 3.07? 1990 XJ with D35 with 4.0L/5-speed, so based on the fact that I never touched the rear axle/diff/gears/carrier/etc... would I have any reason to assume the PO did anything? When I was driving it I get getting 18-20 mpg with 235/75-15s Have I done my research correctly, or might my gearing be different?


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post #2 of 8 Old 01-09-2008, 09:36 AM
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Jack up the rear end, rotate the tire once, and count how many times the drive shaft spins. If its 3x, then you have 3.07s.

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post #3 of 8 Old 01-09-2008, 10:05 AM
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It should be 3.07's, but I "think" if it had the tow package, you got 3.73's.

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post #4 of 8 Old 01-09-2008, 08:37 PM
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uh... look at what the diff tag says?

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post #5 of 8 Old 01-09-2008, 08:40 PM
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I have a 1989 w/ 4.0 and 5 speed and I have 3.07s. You could try the driveshaft method to be sure, but I am pretty positive you have 3.07s, unfortunately.

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post #6 of 8 Old 01-09-2008, 08:51 PM
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Originally Posted by bikedude189
uh... look at what the diff tag says?
Its a 1990 that means its 18 years old. The diff tag is probably gone and has been gone for some time.
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post #7 of 8 Old 01-09-2008, 09:29 PM
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i believe the towing package was automatic only. my 90 w/ 4.0 and 5 speed has 3.07.
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post #8 of 8 Old 01-09-2008, 11:19 PM
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Originally Posted by Blue XJ
It should be 3.07's, but I "think" if it had the tow package, you got 3.73's.
pretty sure the 5spd didnt have the tow package option..but even in the autos with tow package there 3:55

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