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Old 03-24-2016, 03:20 PM
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Gear Ratio Change

1998 4.0 5-spd: One of the items on my to-do list is to change the gear ratios in my rear and front diff from3;07 to 3.73: Going to start collecting the parts and was wondering if I also will have to change the carriers, in addition to ring gear & pinions; I was told that I do. Thoughts?

Thank you,
Joe

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Old 03-24-2016, 03:26 PM   #2
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Yes you will have to change the carriers as well.

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Old 03-24-2016, 03:31 PM   #3
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It sounds like you may not have ever done a gear change. Have you thoroughly researched just how difficult, exacting, and tedious that job is to get the gears set right? I do pretty much all my own vehicle work, have a shop full of tools, air tools, welders, etc. but I draw the line at what it'd take to get new R&P gears installed successfully so they won't fail within the first month of use.

My TJ has been regeared twice and the second time a very experienced R&P installer didn't get it 'perfect' and the new rear gears failed within 6 weeks. The installer blamed himself, though he was one of the best and most experienced in town.

In other words, this is just not a bolt in job.
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Old 03-24-2016, 04:07 PM   #4
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I'm in the middle of a gear change, and I'm lucky to have my boss helping me. He's done several and has the proper tools. Watching along, there is no way I would tackle the job myself. Getting tooth pattern, backlash, and pinion preload just so takes patience and experience IMO. Not saying you couldn't do it, but just know what you're getting into.
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Old 03-25-2016, 07:11 AM
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Thanks for that information; Yes I have done the research and no there is no way I would try to tackle this; I just want to make sure that I am being advised correctly.

Thank you!
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Old 03-25-2016, 07:37 AM   #6
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What tire size are you running now? What's the biggest you plan to go? If you're doing a regear and want bigger than say a 31 inch tire it would be cheaper to regear and future proof yourself now, wouldn't it? Unless you are getting a screaming deal on the 3.73's
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Old 03-25-2016, 12:08 PM   #7
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If you are definitely going to 3:73's, then I have an R&P, I just took out of a Dana 44, with 27 spline differential, and axles, to boot, I am looking to sell. 661-393-7069
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Old 03-25-2016, 12:12 PM   #8
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I also have a Front, 27 spline, Dana 30 differential, with 3:07 R&P, and axles, for sale.
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Old 03-25-2016, 03:13 PM
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Yeah, I plan to keep the stock 15" wheels with no plans to go to bigger tires.
I am contemplating the gear change because the 3:07 gears just cause too much shifting; (In my area there are lots of hills!) But it sure looks like an expensive proposition; I want to, but.....not sure its worth it on a 1998 vehicle.

Joe D.
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Old 03-25-2016, 06:14 PM   #10
Knows a couple things...

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It's worth regearing for nearly any model year Jeep including back to the old CJs. I don't consider your '98 old at all, your TJ is definitely worthy of regearing the axles. Especially since you have that miserable 3.07 ratio.
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Old 03-25-2016, 07:34 PM   #11
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If you are planning to run say, 33" tires, you definitely want to regear and, like, Jerry says, it's definitely worth it. But IMHO 3.73 isn't enough unless your staying stock and then it would definitely be a plus over 3.07's. I ran 3.73 stock gears and then switched to 33's and regeared to 4.56's with my 4.0 and 5 spd. One of the best upgrades I've done.

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