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DIY regearing 3.73 to 4.88

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Old Aug 27, 2011 | 05:14 AM
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Question DIY regearing 3.73 to 4.88

Hi Guys,

I am going for 35" tyres so need to regear as well, however I have a dilemma as the local garages here are not competent to do it (never done it I am sure) so I am thinking about doing it myself. I have watched putting 4.88" gears in my TJ but that is a long time ago. Any thought on the difficulties of DIY rehearing? My Jeep has only 10k on the clock so I am not changing any bearings.

I know you need to make sure to use the correct number of spacers to make sure the gears mesh properly, I believe you use yellow paint to do it. Any hints or tips?

I assume I can just buy the 4.88 Superior gears for a Dana 44 & 30, will they fit on the stock carrier?

Cheers,

Mark
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Old Aug 27, 2011 | 05:34 AM
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Dont do it. Search on here for failed gears. That job is not for us lightweights. Just my opinion of course.
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Old Aug 27, 2011 | 06:17 AM
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Originally Posted by OzzyPotter
Dont do it. Search on here for failed gears. That job is not for us lightweights. Just my opinion of course.
x2

gears are more than bolting things together and torquing them down. really have to know what you're doing
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Old Aug 27, 2011 | 06:22 AM
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Here is a really good thread on it..

https://www.jk-forum.com/forums/show...?82262-Gearing

I would, however also advise seeking a pro. if you make a mistake, you will be buying a lot more parts.
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Old Aug 27, 2011 | 06:38 AM
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Try and find some "how to" videos on youtube or something. It can be done. But it has to be done right.

Any kind of vehicle motorsports in that region? If so, you might find an individual that has enough knowledge to either do it for you, or at least willing to help.

There are some specialty tools that you should use to do this type of work too.

If you have 3.73 then you will not need new carriers, going by the application chart for the ARB lockers website.
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Old Aug 27, 2011 | 06:51 AM
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I didn't think it was too bad. I went to 5.13s and did the install myself. You just need to have all the proper tools and patience. Do not attempt without gauging tools, you will mess it up. I was lucky and the first install of each axle, I had the proper amount of shims. Most dont get that lucky, and it requires installing and pulling out of unit several times. And don't over tighten your crush seal! Did that too mine, and had to reinstall.
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Old Aug 27, 2011 | 11:55 AM
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I have worked around millwrights aligning similar pinion gears on larger more powerful setups. It is something that experience helps get results. You may get by on a once a lifetime install, but for something so critical and under such wear and tight tolerances, I say write the check and enjoy.
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Old Aug 29, 2011 | 01:11 AM
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Originally Posted by OzzyPotter
I have worked around millwrights aligning similar pinion gears on larger more powerful setups. It is something that experience helps get results. You may get by on a once a lifetime install, but for something so critical and under such wear and tight tolerances, I say write the check and enjoy.
Thanks guys, sorry for my late reply, finished my lift on the front this weekend as well as rust proved the chassis, links etc, amazing how quickly it rusts (my jeep is not even a year old)

I fully agree it should be done by a pro but without being obnoxious I am very worried that the likely hood of screwing up (pardon my phrase) by the garage not to mention the dealer. There are only a handful of Jeeps in Brunei and I am the only modified one, take my word for it :-)

Good point, let me get some proper tools to gauge the 'tightness' also indeed let me toll the net for some guidance. Getting it in one go is a master piece, I remember my TJ the local guy assembled and disassembled the diff at least 4 times. Still need to order the Superior gears, I'll go for 4.88, wish me luck.

Any more pointers are very welcome :-0

Cheers,

Mark
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Old Aug 29, 2011 | 01:48 AM
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Originally Posted by Markdsv
... Jeeps in Brunei ...
I think most of those encouraging you to seek a professional didn't take note of your location. Good luck on the job, Mark!
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Old Aug 29, 2011 | 05:03 AM
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Originally Posted by Mark Doiron
I think most of those encouraging you to seek a professional didn't take note of your location. Good luck on the job, Mark!
Hi Mark,

Thanks, indeed I think I can do a better job then my local garage......their policy is 'if it doesn't fit use a hammer'.....if it still doesn't fit....guess what? indeed use a bigger hammer. So I am going to do it myself, i set myself a game plan to start with removing my front props haft so I don't have to do front and rear in one go. Next challenge is finding some proper gauging tools.

Btw a big thank you to the person who gave me the link to an incredible write up, fantastic detail and as I have seen it before I can very much relate to his comments and notes !

Fingers crossed, first need to order them
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