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Old 01-16-2012, 04:41 AM   #1
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4.10 or 4.56??

I currently have 33x12.5x15 on my jeep with the stock gear ratio. I'm wanting to do a gear swap but not sure what ratio to go with. After my gear swap, I am looking to change tire size to 35x12.5x15. Can anyone shed some light on what ratio gears I need to go with. Thanks for the help

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Old 01-16-2012, 04:47 AM   #2
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Might want to give your
Trans info and Engine info and someone with the knowledge will be able to help.
I would say between the two, 4.56 would be it. Depending on your specs, you might need 4.88

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Old 01-16-2012, 04:57 AM   #3
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Its a 4.0L with a 5 speed trans.
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Old 01-16-2012, 06:17 AM   #4
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I will be running 33's and 4.56's with a 4.0 5 speed.... everything I have read points me in this direction. I 'think' you would be fine with the same and 35's, though most would probably say 4.88's.

I would look at some gear charts on the web and make an educated decision... just remember.... MOST gear charts are made using a 1:1 ratio ( 5th gear is an OD ). Look at the charts closely to ensure what their chart is based on. So you may need to a little math to get your RPM correct to match your gear for an educated and well-though out direction for gears.
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Old 01-16-2012, 06:24 AM   #5
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Try this one, you'll need to find out all the specs for your trans(1-5 gear ratio) and tcase
Gear Ratio Calculator
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Old 01-16-2012, 07:08 AM   #6
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Since you do have the 5 speed with OD and wanting to go with 35s eventually I would go with the 4.88s you will be happy with those with 33s too.
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Old 01-16-2012, 07:56 AM   #7
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4.0 with the 5 speed running 33 inch tires go with the 4.56, 35 inch tires go with the 4.88.
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Old 01-16-2012, 08:17 AM   #8
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My only concern is running down the road. I know a 4.56 gear will cause my keep to run higher rim's, just don't want a 4.88 to rev to the moon. This is the first time I have ever changed gear ratio on anything
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Old 01-16-2012, 08:21 AM   #9
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Jeep not keep and rpm not rim
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Old 01-16-2012, 09:14 AM   #10
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My 97 runs the 4.0 with the 5 speed with 4.56 gears and 33" tires. Very rarely do I find the need to rev over 2500 rpm leave alone 3000. On the freeway at 65 MPH in fifth I'm turning about 2100 RPM's.
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Old 01-16-2012, 09:19 AM   #11
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Originally Posted by TJWenatchee View Post
My 97 runs the 4.0 with the 5 speed with 4.56 gears and 33" tires. Very rarely do I find the need to rev over 2500 rpm leave alone 3000. On the freeway at 65 MPH in fifth I'm turning about 2100 RPM's.
x2 on that. I have the exact same setup and love it. I would have been disappointed if i had chosen 4.10s. with the 4.56s my Jeep has a sh*t ton of torque, and a nice crawl ratio when in four low
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Old 01-16-2012, 09:36 AM   #12
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Back when I had my 4.0 5speed I running 36" iroks on 4.56 gears ran great 2300 don at 70mph. Since I bumped up th the to my heavy humvee wheels/tire I built a 4.7l stroker and still running 4.56 gears. When I was messing with the gear calculatter I found 4.56 would put back to stock power for 35's. I know I got a YJ but its the same motor/trans combo.
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Old 01-16-2012, 09:55 AM   #13
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I recommend 4.88 for 35s for your setup. You need the higher revs to push the jeep through the air and turn the heavy tires. I had 4.56 and 33s and its perfect.
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Old 01-16-2012, 10:04 AM   #14
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with the 5 speed and 33's the 4.56 was pretty great. with 35's i wish i would have installed 4.88's...
then i swapped to the aw4 auto and that made a good difference for the 35s but still i think id ultimately like the 4.88 gears.

there is not a huge difference between 4.56 and 4.88. same with 4.10 and 4.56. we noticed that swapping from 4.10 to 4.56 was totally not worth it on one of our jeeps. even less of a difference between 4.56 and 4.88. this is why i am not swapping again.

one last thing, my jeep is set up for some pretty gnarly stuff off road but i drive it primarily on road. it gets used on both but not equally. it crawls very well in the slick rock and can manage nicely on the freeways and towns.
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Old 01-16-2012, 11:39 AM   #15
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Quote:
Originally Posted by dodgeboy31807 View Post
Its a 4.0L with a 5 speed trans.
Don't even consider 4.10 for 33" tires or 4.56 for 35" tires... your rpms would be too low on the highway since neither of those combinations truly restore all the power lost caused by the bigger/heavier tires.

If you plan to go to 35" tires in the near-term future, go to 4.88. I ran 4.88 with 35" tires, 5-speed, and 4.0L and it was a perfect combination. RPMs were roughly 2700 at 70 mph which is exactly what you need to run that big and heavy of a tire. 2700 may seem like a lot but it's not, it takes more RPMs to run a Jeep on the highway after it has a suspension lift (more wind resistance) and bigger/heavier tires that are harder to turn.
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Old 01-16-2012, 04:47 PM   #16
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Ok. Going with a 4.88 setup, will I need to change anything else or just a simple gear swap. Im trying to figure what I'll have in this project
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Old 01-16-2012, 04:53 PM   #17
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Quote:
Originally Posted by gixxerphil
Try this one, you'll need to find out all the specs for your trans(1-5 gear ratio) and tcase
Gear Ratio Calculator
3.83, 2.44, 1.33, 1, .79 for the ax15
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Old 01-16-2012, 04:57 PM   #18
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Quote:
Originally Posted by dodgeboy31807
Ok. Going with a 4.88 setup, will I need to change anything else or just a simple gear swap. Im trying to figure what I'll have in this project
You'll need a new speedometer gear to make your speedo read true.
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Old 01-16-2012, 06:24 PM   #19
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No locker, or center case. Just gears and the speedometer drive gear?
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Old 01-16-2012, 06:41 PM   #20
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Originally Posted by dodgeboy31807
No locker, or center case. Just gears and the speedometer drive gear?
You'll need a master install kit for the front and another for the rear, ring and pinion front and rear, and possibly new carriers, don't quite remember.
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Old 01-16-2012, 07:05 PM   #21
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No locker, or center case. Just gears and the speedometer drive gear?
Don't buy the gearing with the plan of giving it to an install shop to install. If anything goes wrong, and that does happen, they'll blame your parts or tell you you didn't buy the right parts. Let the installling shop provide everything which means their warranty will have to cover everything.

And if you're planning on installing the new ring & pinion gears on your own, it's clear from your questions that you don't have the experience required to install those particular gears. They are finicky on how they are set up which involves lots of trial and error with shims to get them to mesh properly. Not even experienced R&P gear installers get it right every time and when it's not perfect, the new gears will be toast in short order.
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Old 01-16-2012, 08:09 PM   #22
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That was my intentions. Im trying to price items online to get an idea of parts cost. I could set one up but its too pricey from the looks of things that I don't want to buy parts twice
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Old 01-23-2012, 02:31 PM   #23
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I have a 97 Sahara with a ford 8.8 with 4.56 in the rear. I6 with 3 Spd auto.

I am running 33s now. Will 35s be ok? Once I regear the front to 4.56???
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Old 01-23-2012, 02:50 PM   #24
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Originally Posted by OKLAHOMA_TJ
I have a 97 Sahara with a ford 8.8 with 4.56 in the rear. I6 with 3 Spd auto.

I am running 33s now. Will 35s be ok? Once I regear the front to 4.56???
Definitely. For the 3 speed auto 4.56 is recommended for 35" tires.

Edit: correction for future searches
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Old 01-23-2012, 03:38 PM   #25
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How about if I go to 35s???
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Old 01-23-2012, 03:39 PM   #26
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How about if I go to 35s???
Aww man I'm sorry I meant to say 35s. 4.56 is perfect for 35s, 3 speed, and 4.0L. 4.56 would be a little over geared for 33s, and perfect for 35s.
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Old 01-23-2012, 03:50 PM   #27
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dont mean to hijack or anything, but i was wondering how bad my jeep will be with 3.37s and 35s? i have an 05 so i have a 6spd if that helps any. just saving untill i can regear. and when i do would 4:56 be ok for me? or sometihng different
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Old 01-23-2012, 03:54 PM   #28
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dont mean to hijack or anything, but i was wondering how bad my jeep will be with 3.37s and 35s? i have an 05 so i have a 6spd if that helps any. just saving untill i can regear. and when i do would 4:56 be ok for me? or sometihng different
You mean 3.73's and it will be a dog on 35's.. Im almost positive your best going to 4.88's with your 6 speed.
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Old 01-23-2012, 04:35 PM   #29
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If you plan to road your jeep any distance and have overdrive go 4.56 for 33" and 4.88 for 35" tires. You won't be sorry.
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Old 01-23-2012, 04:41 PM   #30
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If you plan to road your jeep any distance and have overdrive go 4.56 for 33" and 4.88 for 35" tires. You won't be sorry.
i think this is best for the 5 speed

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