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Old 01-06-2010, 10:38 PM   #1
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98 sahara gearing?

i bought a 98 sahara a couple months ago and i was wondering what factory rear gearing ratio was? i know the guy i bought it from had to replace the rear transfer case and put a dana 44 in there, my question is that im running 33's and i wanted to know if i have the correct gearing and how would i go about finding out. thanks ahead for any input

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Old 01-07-2010, 12:43 AM   #2
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3.73 should be the factory ratio for the 98 sahara.

But you stated he changed the rear axle...the gear ratio change also during the swap?


Couple different ways to check the axle ration...

pull the diff cover and start counting teeth and do a little math or.
jack up the rear and count the driveshaft rotations.

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Old 01-07-2010, 01:04 AM   #3
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is a 3.73 ok to run on 33's? i know he did replace the rear axles cause he put a dana 44 in. im not sure if there was one in there before but i know he had to replace the transfer case.im not sure if he regeared.
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Old 01-07-2010, 01:15 AM   #4
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I prefer 4.56's with 33's. but it you do a lot of highway. 4.10's maybe for you.

Only way for you to know for sure what the gearing is , is to check. HOPEFULLY..the previous owner was not stupid enough to mix gear ratio's front and rear. They NEED to be the same to use 4x4 if not very expensive things WILL break.

I'd assume the PO just replaced the rear due to the original being a broken D35 and he was smart enough to replace it with the factory D44 with matching ratio.

Only way to know for SURE is to physically check.
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Old 01-07-2010, 01:23 AM   #5
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I prefer 4.56's with 33's. but it you do a lot of highway. 4.10's maybe for you.
When I made the mistake of regearing to only 4.10 for the 33" tires I used to run, it was especially on the highway where I soon noticed I hated the 4.10 ratio. I had to downshift to 4th gear for even minor grades and I regretted not having regearing to 4.56 as friends recommended the entire time I drove with that combination.
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Old 01-07-2010, 01:23 AM   #6
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I said "maybe"...I know I'd hate it too.
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Old 01-07-2010, 01:26 AM   #7
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ok thanks dude i pull the diff cover tomorrow and count the teeth.
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Old 01-07-2010, 01:34 AM   #8
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"dude"...I'm not that young.

Easier to just jack up the rear and spin the tire.

Mark the driveshaft with a marker/chalk...mark the tire .
Jack a tire off the ground ...rotate tire 1 full rotation slowly and count how many times the driveshaft rotates.

3 1/2 times = 3.55's
3 3/4 times = 3.73's
4 ish times = 4.10's
4 1/2 times = 4.56's
and so on.

If you pull the cover you need to do a diff fluid change..if you have never done a diff fluid change since your purchase of the jeep. It is a great idea to do.

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