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4.56 Re-gear First Impression

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Old 06-17-2013, 11:00 PM   #1
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4.56 Re-gear First Impression

I finally took the plunge after being disappointed with the mpg & power loss when I went to 32" tires. My truck always felt slow and would constantly downshift while driving up the slightest incline. I would average about 250 miles per tank after calculating the 4.7% difference in tires. The stock 3.73 gears were severely under matched for anything but the pizza cutter P245/75R16 Dunlop’s that came with the truck.

I decided to go with Nitro 4.56 gears and dropped off the truck at Just Differentials in Cashmere WA. A day later I received a call from Carl Montoya that my truck was ready.

My first impression was "wow" what a difference. As soon as I put the truck in drive it felt like I was in 4 low. The response from the pedal input was great and the truck would come up to speed much faster than before. Also the problem of constant downshifting from hills went away.

I'm still going through the break in process so I haven't hit highway speeds but at 50 mph I'm at 1800 rpm. Also with my 275/65R16 winter tires I have on right now my speedometer is only half a mile off, at 50 mph my GPS is reading 50.5 mph.

Hopefully this info. helps people on the fence about re-gearing. Here are some shots of my stock 3.73 ring and pinion with only 15K miles.





* 500 Mile Update

I reached the 500 mile mark so it was time for the mandatory fluid change. The front diff fluid was just slightly darker than the new Amsoil 80w-90 that was put in when the gears were installed. The rear diff fluid was a different story; it was dark and smelled rancid. Both the front and rear drain plugs were coated with a thick layer of dark metal particles and a few shavings.

The break in schedule I followed were heat cycles of 15 miles with varied speed and nothing over 50 mph. After 15 miles I would stop and allow the rear diff to cool enough where I could keep my hand on it. The 500 miles were broken up over a 10 day period.

I still don't have any firm fuel mileage data but the preliminary numbers show an improvment. Now that I'm driving it normal I will go through a few gas tanks and then report back my findings.

Rear Diff Fluid


Metal shavings from both drain plugs


RJM
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Old 06-17-2013, 11:21 PM   #2
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What'd it run you all said and done? Did you buy the parts first?
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Old 06-17-2013, 11:30 PM   #3
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The invoice total was $2183 not including WA State sales tax, this was for parts and labor. The price may seem a little steep but was completely worth every penny. The guys over at Just Differentials do top notch work and treat their customers right.

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Old 06-18-2013, 06:43 AM   #4
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Thousand bucks a pumpkin, not bad... Any traction devices installed?
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Old 06-18-2013, 06:50 AM   #5
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Thousand bucks a pumpkin, not bad... Any traction devices installed?
From the quotes I get and the general discussion around here that's about the going rate.
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Old 06-18-2013, 07:33 AM   #6
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Sounds way steep to me, but maybe it's a Tacoma thing. I paid $1200 total for front and rear 4.10's on my CJ7 4 years ago.
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Old 06-18-2013, 10:34 AM   #7
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Quote:
Originally Posted by Gearheadesw View Post
Thousand bucks a pumpkin, not bad... Any traction devices installed?
No traction devices installed just the gears and master install kits.

RJM
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Old 06-18-2013, 10:40 AM   #8
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4.56 for 32s?
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Old 06-18-2013, 10:51 AM   #9
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Originally Posted by DirtEater View Post
Sounds way steep to me, but maybe it's a Tacoma thing. I paid $1200 total for front and rear 4.10's on my CJ7 4 years ago.
The Nitro pinion is beefier than standard gear sets so I think this is what drives the price also. Who installed the 4.10's in your jeep?

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Old 06-18-2013, 10:53 AM   #10
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Originally Posted by tostidos View Post
4.56 for 32s?
That's right....I don't need no stinkin' supercharger.

RJM
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Old 06-18-2013, 11:02 AM   #11
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Quote:
Originally Posted by tostidos View Post
4.56 for 32s?
I was confused about that to.. If anything I would of done 4.10s with 32" tires but not my truck as long as OP is happy
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Old 06-18-2013, 11:05 AM   #12
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I can understand wanting the power out of it. Not too many daily drivers go over their ideal gear ratio for mileage reasons.

I my self am considering running mid-high 5's on 35's for power only
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Old 06-18-2013, 11:09 AM   #13
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Interesting to see what you end up getting for mileage.

These the wheels you re-geared for?


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Old 06-18-2013, 11:13 AM   #14
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Quote:
Originally Posted by tostidos View Post
4.56 for 32s?
Quote:
Originally Posted by Gincoma View Post
I was confused about that to.. If anything I would of done 4.10s with 32" tires but not my truck as long as OP is happy
Local member here running 4.88s with stock 245s & a 4banger and he couldn't be happier.
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Old 06-18-2013, 11:23 AM   #15
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Old 06-18-2013, 01:17 PM   #16
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Quote:
Originally Posted by Gregman View Post
Interesting to see what you end up getting for mileage.

These the wheels you re-geared for?
I have different wheels on now but the same tires. Those 20" wheels are heavy mothers, I'm sure all that unsprung weight didn't help my cause.

RJM
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Old 06-18-2013, 02:16 PM   #17
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Who installed the 4.10's in your jeep?
Off Road Warehouse (ORW) in San Marcos, CA. I lived south of there in Poway at the time.
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Old 06-18-2013, 10:05 PM   #18
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Quote:
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I have different wheels on now but the same tires. Those 20" wheels are heavy mothers, I'm sure all that unsprung weight didn't help my cause.

RJM
Why do u have 20 inch wheels and rocks sliders?
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Old 06-18-2013, 10:08 PM   #19
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interesting

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Old 06-18-2013, 10:09 PM   #20
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i had them do my 4.88s earlier this year. couldn't be happier!
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