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Topic Review (Newest First)
04-04-2012 12:53 PM
wmwhitey
Quote:
Originally Posted by MTH View Post
Neither will actually produce any more power. What gearing does is raise your RPMs more rapidly, so that the engine puts out more of its power at lower speeds. In other words, it has the effect of putting more of the existing engine power at the wheels more rapidly, but it doesn't actually change the power curve of the engine.

For example, where you might have been at 1800 RPMs at 70 mph in 6th gear with 3.21s on 35s, you'd be at nearly 2800 RPMs with that same set up with 4.88s.

The reason you don't want to go too high is because you "run out of gear." With 5.13s, you'd be spinning almost 2900 RPMs at 70 mph in 6th gear. If you ever pushed 80 mph, you'd be over 3000 RPMs and no "7th gear" to shift to. In general, that's too high for most folks to be comfortable with on the highway long term.

But if you never go on the highway, by all means head to 5.13s.
Thanks for educating me on that I do need to go on the highway some so 4.88 gears it is going to 4wheel parts today when they open here I will let you guys know what they say.
04-04-2012 12:49 PM
MTH
Quote:
Originally Posted by wmwhitey View Post
Ok guys one more question why the 4.88 gears over the 5.13? wont the 5.13 just give me more low end power?
Neither will actually produce any more power. What gearing does is raise your RPMs more rapidly, so that the engine puts out more of its power at lower speeds. In other words, it has the effect of putting more of the existing engine power at the wheels more rapidly, but it doesn't actually change the power curve of the engine.

For example, where you might have been at 1800 RPMs at 70 mph in 6th gear with 3.21s on 35s, you'd be at nearly 2800 RPMs with that same set up with 4.88s. Your engine puts out considerably more power at 2800 RPMs than it does at 1800 RPMs, and, therefore, the jeep will be much more "powerful" at 70 mph with 4.88s than with 3.21s.

The reason you don't want to go too high is because you "run out of gear." With 5.13s, you'd be spinning almost 2900 RPMs at 70 mph in 6th gear. If you ever pushed 80 mph, you'd be over 3000 RPMs with no "7th gear" to shift to. In general, that's too high for most folks to be comfortable with on the highway long term.

But if you never go on the highway, by all means head to 5.13s.
04-04-2012 12:34 PM
wmwhitey Ok guys one more question why the 4.88 gears over the 5.13? wont the 5.13 just give me more low end power?
04-04-2012 08:56 AM
kbwwolf And it sounds to me like you're wanting to buy the gears yourself. Don't. Buy master kits (for the gears) through the shop that's gonna do your regear. That'll keep the gear mfr AND the shop warranties intact.

The reason for the master kits is because even the best gear mechanics will more than likely trash some things (pinion nut) during the removal of your old gears. Best to have whole new kits on hand...

I would agree with the 4.88 assessment for a manual, especially in the hilly terrain of Hawaii.
04-04-2012 08:45 AM
MTH I vote for 4.88s for a manual transmission pre-2012 with 35s.

Also, to be clear--you need to do front and rear gears together, unless you plan on removing your front driveshaft as well and becoming a 2wd Wrangler.

Finally, if you want lockers, it's financially advantageous to do them with the gears. Much of the install labor is duplicative. If you do them separately, you'll be paying twice to have guys take apart your differentials.

Just my two cents.
04-04-2012 08:37 AM
Casotakar1229 helpful thread. it was also recommended to me to either get 4.56 or 4.88 for gears. I also have a manual transmission. I am just going save save save until I can get a d44 front and the lockers at the same time. it is worth just getting it all done at the same time and then forgetting about it. stopped the mods for a while so I can do that.
04-04-2012 05:24 AM
JEEPDON
Quote:
Originally Posted by wmwhitey View Post
ok I have another question how do I find out my DS spline count? and I think I will have to hold off on the arb lockers till later.
Personally, I would save cash till I could afford the ARB's before doing anything. Going into the diff's twice will be really expensive. Getting it all done at one time= less expensive. I save until I could afford the Rubicon edition D44's front and rear, and am not regreting it!!
04-04-2012 03:09 AM
wmwhitey ok I have another question how do I find out my DS spline count? and I think I will have to hold off on the arb lockers till later.
04-04-2012 02:53 AM
XJ Knight No that is a very good price.. didn't realize that was with ARB's.. With the manual trans you'll want to go to 456's or 488's.. But being where you live I'd choose the 488's.. 5.13's would be needed if you had the auto..

Others when they wake up and see this thread or those that do see it will fill in there opinion also on what would be better the 456's or 488's.. But I feel most to all will agree to go with the 488's..


And once again.. That is a really good deal on ARB's and regearing
04-04-2012 02:38 AM
wmwhitey I have a manual tranny and that is with arb lockers front and back.

Is that still to much?
04-04-2012 02:30 AM
XJ Knight 3K is scary high.. most gear swaps outside of having it done at a stealership are 1200 bucks give or take a few hundred dollars.. If you paying more then 1800 bucks your over paying..

Wether you gear to 5.13's or 4.88's depends on your transmision.. I should have asked this right away, is your Jeep a auto or manual?
04-04-2012 02:16 AM
wmwhitey Hey thanks for the info I was looking into it and guess I will be heading back to 4wheel parts here I go there due to the no shipping charge to get the parts on Island. should I do a 5.13 gear swap or 4.88 looking at both for F/B is only about 100 bucks different. but front and back looks around 3k not to count the instal. should I look other places for a full swap out kit or is 3k a ok deal?
04-04-2012 02:07 AM
XJ Knight Going to 5.13's will definently bring your power back to stock range. If you use 4wd you will have to swap out the gearing in both the front and rear axle as you can not use 4wd with two different gear sets.

Look around the island for 4wd shops and talk to them about axle gearing swap prices.. Most 4wd shops do that kind of work.. This is also a good time to add a locker or two if you want them at the time of the regear.
04-04-2012 01:48 AM
wmwhitey
Gear head question

Can I swap out my stock dana44 gears for Dana 44 5.13 JK Rear Gear Set and have more power? Also if I put Dana 30 5.13 JK Front Gear what will it do for me? will it get me back to the power I had before I added the 35" tires?

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