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Old 12-12-2007, 09:43 AM   #1
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4.56's and 35's!

As some of you may know, I took a chunk out of my ring gear in my rear end while "snow drifting" a week ago.... So I decided to just go ahead and order 4.56 gears for my front and rear..... I'm running 35" shoes on my heep also....

My question is, will the gears be retardedly low? how 4low gonna be? How much am I looking at my speedo being off by with the stock speedo gear?

Thanks
Neil

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Old 12-12-2007, 09:48 AM   #2
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Originally Posted by Odd is he View Post
As some of you may know, I took a chunk out of my ring gear in my rear end while "snow drifting" a week ago.... So I decided to just go ahead and order 4.56 gears for my front and rear..... I'm running 35" shoes on my heep also....

My question is, will the gears be retardedly low? how 4low gonna be? How much am I looking at my speedo being off by with the stock speedo gear?

Thanks
Neil
As far as the speedo, if you haven't regeared it yet, it's probably already way off, but you can order the gear to fix it, and I think it is pretty simple to do.

Look here for a start..

http://www.quadratec.com/products/pr...libration&pg=1

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Old 12-12-2007, 11:31 AM   #3
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Quote:
Originally Posted by Odd is he View Post
As some of you may know, I took a chunk out of my ring gear in my rear end while "snow drifting" a week ago.... So I decided to just go ahead and order 4.56 gears for my front and rear..... I'm running 35" shoes on my heep also....

My question is, will the gears be retardedly low? how 4low gonna be? How much am I looking at my speedo being off by with the stock speedo gear?

Thanks
Neil
4.56s are not too low. If it were mine I would run 4.88s or 5.13s, depending on which transmission you have. If I had re-geared my Rubicon, I would have installed 4.88s....and it only had 33s.

As far as your speedometer error, divide your current ratio by the 4.56 which will give you a number indicating the percentage by which your speedo will change.

For instance:

If your current gears are 3.73s............

3.73/4.56 = .82

Which means that the 3.73s are 82% of the 4.56s or that the 4.56s are 18% lower than the 3.73s and the speedometer will indicate 18% faster than it did before.

At an actual speed of 65 the speedometer would be indicating 77 mph.

Of course your 35 inch tires also play into the equation........

If you had 30 inch tires stock......

The circumference of a 30 inch tire is 94 inches. For a 35 inch tire it is 110 inches.

Dividing 94/110 = .85 or 85%

So the 35 inch tires reduced your overall speedometer indication by 15% and the gears increased it by 18% which results in a net change of a 3% increase in indicated speed over stock.

65 mph X 1.03 = 67 mph

One thing to remember when selecting gears..........

Peak torque on you 4.0 liter is rated at approximately 3200 rpm. This is the point on the torque curve with the lowest Brake Specific Fuel Consumption, which simply means your engine burns less fuel per horsepower here than at any other spot on the curve. Because of this fact, you can sometimes increase fuel mileage by going to lower gears....... You also get a peppier more powerful vehicle on the highway in overdrive. It is for this reason that the first performance enhancing mod you should make is to re-gear. It is the best bang for the buck you can spend.

Food for thought.
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Old 12-12-2007, 03:13 PM   #4
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4.56s are not too low, I would run 4.88s with 35's
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Old 12-12-2007, 04:03 PM   #5
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i have 4.56 gears with 35s and it work perfect for me. in the mountains i would go with 4.88.
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Old 12-12-2007, 08:40 PM   #6
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i have 4.56 gears with 35s and it work perfect for me. in the mountains i would go with 4.88.
+1. I have 35's and 4.56s and they're not ridiculously low at all. Like nic said they could even be lower. I like my gearing setup most of the time, sometimes it just needs to be lower it feels like.
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Old 12-13-2007, 12:01 PM   #7
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4.56 not too low. I think 4.56 perfect for 33's 4.88 perfect for 35's. (street anyway) I got about 3-5 MPG better when I went to 4.56's.

In low you should be okay. it depends if you have a manual or auto. If manual then you will be 3.83=tranny, 2.72=tcase, 4.56=axles===47.5 which is decent. If your used to stock gears you will think you are the crawl master. If you have an auto then your crawl ratio will be less, but you can
X2 everything thanks to the torque converter. I don't know the first gear of the auto.

You'll love the new gears andthe ability to use 5 the gear.
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Old 12-13-2007, 12:12 PM   #8
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I ran 456 gears with 35" tires, and I kicked myself for not running the 488's.
Of course.... I only had a 4 cylinder...

Go 488's.. You will not be sorry.
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Old 12-13-2007, 12:30 PM   #9
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sorry i forgot to say that i have the 4-spd auto tranny. in my opinion 4.56 and 35s are perfect with this tranny. at 65 mph there are 2100-2200 RPM in the 4th gear with OD. thats enough to hold the speed on our freeways (we have some small hills but no mountains here).
i can accellerate moderate without the tranny shifting down. if i want to accellerate faster it shifts down in the 3rd gear. and then when i reached the speed i want it goes in 4th gear with OD again. it holds the speed in 4th with OD up to 90 mph.
in the mountains i would go with 4.88 or better 5.xx (if it would be possible).
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Old 12-14-2007, 08:18 AM   #10
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I replaced my R & P with stock gears for now 3.73.... But i have a full set of 4.56s sitting on the side... most likely gonna return them now

Thanks for the advice, I'll be making up another thread, on welded spiders gears now...

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