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Unread 01-09-2008, 10:31 AM   #1
babyfood1217
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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?

-Chris

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Unread 01-09-2008, 10:36 AM   #2
rocketman121
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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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Unread 01-09-2008, 11:05 AM   #3
Blue XJ
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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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Unread 01-09-2008, 09:37 PM   #4
bikedude189
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uh... look at what the diff tag says?
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Unread 01-09-2008, 09:40 PM   #5
SamO
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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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Unread 01-09-2008, 09:51 PM   #6
gradysjeep
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Quote:
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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Unread 01-09-2008, 10:29 PM   #7
Willy36
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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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Unread 01-10-2008, 12:19 AM   #8
lifted92xj
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Quote:
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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