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Unread 08-08-2013, 06:16 PM   #1
weerwolv
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Axle Gearing Decision-What would you recommend?

Hi all,

Currently running on swapped D30 and D35 axles, both running the 4.10 gears.

I have a 4.0 with the AX15 and running Toyo MT 33x10.5 tires on 15" wheels

Getting ready for a big axle swap project and want to do it right

Maximum tire size I will ever run is 35" as I need to put this on the road 60 percent of the time with wheeling 40 percent of the time and don't want to go crazy.

I've decided on a Crate D44 built with the ARB locker already installed on 35 spline shafts.

I'm now stuck on what to do gearing wise. The 4.10 are OK for a DD rig on 33's but I can see how useless they would be for 35" tires

4.88 seems to be where everybody says you should be for 35's for the best offroad rig. That sounds good but I need to be on the highway from time to time.

4.56 seems like a good compromise as it'll make my 33's work better and leave me the option to go to 35's in the future without gearing again.

Got to regear the D30 for this project so I only want to do it once.

I live in New England so we don't have the engine elevation issues some of you folks have so I'm thinking 4.56 is my best choice. Any thoughts and recommendations?

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Unread 08-08-2013, 06:28 PM   #2
dillonjm
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I liked the 4.88s on the highway too, I hardly ever had to downshift out of 5th, which was nice, but 4.56s would work about the same.

You'll be happy with either one.
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Unread 08-08-2013, 06:31 PM   #3
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I am running 4.56's with 35's. 4.0, well actually a 4.6 stroker, AX15. I love the way my jeep does both on the paved road and not paved road. I DD my jeep and do see some overpasses on my daily drive to and from work. I am in West Texas so it is flat land but we do have wind from hell. I can cruise in 5th gear, 70mph(GPS confirmed) turning around 2200-2300RPM and not have a problem with power. I think for what you want out of your rig, mostly DD and some trail time the 4.56 will be great.
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Unread 08-08-2013, 07:23 PM   #4
calvynandhobbs
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I ran 4.56s in my TJ w/4.0 and AX15 and 33s. They were nice, but I wanted a little more low end grunt and I'm also going to 35s on the YJ so I've got a set of axles with 4.88 gears ready to go in. I actually have 2 sets. One set up SUA and the other SOA, both with 4.88 gears already in them. Deciding which way I'm going to go.
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Unread 10-31-2013, 02:23 AM   #5
Gausswave
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I hope this isn't too much of hijack but I'm in a similar quandary. Looking to run a 33-35" tire. Online calculators suggest 3.73 is a better stock match. Driving wise I'll be 70/30 the 30% off road in the pacific NW. No real rock crawling but I do end up fighting wet heavy snow on the west cascades in the winter. I'm a transmitter engineer so I get paid to play! After reading this it seems the practical wisdom suggests even 4.10's might be a bit high?
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Unread 10-31-2013, 03:44 AM   #6
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Quote:
Originally Posted by Gausswave View Post
I hope this isn't too much of hijack but I'm in a similar quandary. Looking to run a 33-35" tire. Online calculators suggest 3.73 is a better stock match. Driving wise I'll be 70/30 the 30% off road in the pacific NW. No real rock crawling but I do end up fighting wet heavy snow on the west cascades in the winter. I'm a transmitter engineer so I get paid to play! After reading this it seems the practical wisdom suggests even 4.10's might be a bit high?
Unless your running v8 power I dont think 3.73 would be wise, I would run 4.10 min! And thats coming from another pnw resident!!
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Unread 10-31-2013, 06:27 AM   #7
StanF
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Buying a crate axle sounds awesome!

Would 4.88s give you a "little" better crawl ratio when offroad? That might be helpful, depending on the type of offroading you do (rock crawling, etc). For mudding, you probably want 4.56.
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Unread 10-31-2013, 06:54 AM   #8
calvynandhobbs
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Quote:
Would 4.88s give you a "little" better crawl ratio when offroad?
There would be a slight different, but not a lot. When I went from 3.73s to 4.56s in my TJ on 33s the crawl ratio was very noticeable. I could go up some inclines without any gas and made rock gardens much easier to navigate without using nearly as much clutch, brake or gas pedal. I liked the ratio so that is why I'm going to 4.88s on my 35s.
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Unread 10-31-2013, 07:22 AM   #9
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No one seems to have mentioned the difference between 4.56 and 4.88's is only 2 or 300 rpm's on 35's.
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[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

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Unread 10-31-2013, 07:35 AM   #10
calvynandhobbs
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Quote:
Originally Posted by Siva283 View Post
No one seems to have mentioned the difference between 4.56 and 4.88's is only 2 or 300 rpm's on 35's.
It's not much difference at all. My opinion is that if you're paying for regearing go ahead with the 4.88s. The installation cost is the same if you're paying someone else to do it. I got lucky when I had my TJ and found a used set of axles to swap in that had 4.56 gears for less than half the cost to have someone regear and i got lucky again and found a D44/8.8 with 4.88 gears already installed to swap into my YJ.
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Unread 10-31-2013, 07:48 AM   #11
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Go lower than you thought originally. Better to be screaming on the freeway than bogged down.
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Unread 10-31-2013, 08:14 AM   #12
Siva283
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Quote:
Originally Posted by calvynandhobbs View Post
It's not much difference at all. My opinion is that if you're paying for regearing go ahead with the 4.88s. The installation cost is the same if you're paying someone else to do it. I got lucky when I had my TJ and found a used set of axles to swap in that had 4.56 gears for less than half the cost to have someone regear and i got lucky again and found a D44/8.8 with 4.88 gears already installed to swap into my YJ.
This is my thought. If a couple hundred RPM's are gonna break you then you need to rethink your gear choice. Go with 4.88 and thank me later
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[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 10-31-2013, 08:49 AM   #13
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What about a non overdrive tranny?
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Unread 10-31-2013, 11:19 AM   #14
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Again, not to hijack, but I'm having a similar quandary...

Jeep 2.5, 35s, ax5(ax15 future).

5.13 or 5.38? I know conventional wisdom is you can't over-gear the 2.5, but I also DD and plan on some 1k+ mile road trips. I want to be able to comfortably cruise 75 all day long.

Thanks for putting up with my mini-hijack.

Cheers
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Unread 10-31-2013, 11:42 AM   #15
zeus87gn
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Quote:
Originally Posted by Gausswave View Post
I hope this isn't too much of hijack but I'm in a similar quandary. Looking to run a 33-35" tire. Online calculators suggest 3.73 is a better stock match. Driving wise I'll be 70/30 the 30% off road in the pacific NW. No real rock crawling but I do end up fighting wet heavy snow on the west cascades in the winter. I'm a transmitter engineer so I get paid to play! After reading this it seems the practical wisdom suggests even 4.10's might be a bit high?
Your profile says you have the 4.2
If your tires are going to be 33', then yes - 3.73s are just right
If you plan on 35s, then definetely 4.10s

I originally wanted 3.73s for 33" tires - I was talked into 4.10s
the 33s are ok with the 4.10s, but I need a 6th gear for the highway
and I don't use 1st much
I plan on going to 35s in the future
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