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Just changed ring & pinions to 4.56

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Old 12-07-2013, 08:20 PM   #1
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Just changed ring & pinions to 4.56

Hey guys, I changed my ring and pinions to 4.56. This has made a huge difference in the way my FJ performs on the road and off. I actually picked up approximately 1-1.5 mpgs as long as I keep it 65 mph or below. 70-75mph I lose almost 2 mpgs. I live in a very mountainous area and this gear change has allowed the transmission to stay in a higher gear with better throttle response. The 3.73s were just too tall. I had East Coast Gear Supply build the 3rd members and ship them to me. They installed an ARB locker in the front. I got fantastic service from them and they were a real pleasure to deal with. Sooo... If any of you are riding the fence on a gear ratio change... do it.. You won't be sorry.. Be sure to do the proper break-in on the new gears.. ECGS has instructions on their website.
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Old 12-07-2013, 08:39 PM   #3
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265/75/16 Toyo Open Country MT. I am going to 285/75/16 as soon as I modify the body mount in the front wheel well. The 285s are 32.86 inches in diameter. This change will decrease my rpms by 80 @ 65mph and 88 @ 70 mph. The taller tire will only increase my crawl distance by 1 foot per minute @ 1,000 rpms in low range. I have the new tires sitting in the garage and it is killing me not having them installed...
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Old 12-07-2013, 09:05 PM   #4
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Ohh ok, I'm running 285/70/17s right now about about to switch to some 35s and trying to figure out what gears to go with.
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Old 12-07-2013, 10:07 PM   #5
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I also have 4:56 on 285/75-16 and love them. The truck runs so much better that its gonna be an automatic upgrade when going to larger tires from now on.
I would go with 4:88 if I had 35's. I also rarely drive over 70mph.
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Old 12-08-2013, 08:12 AM   #6
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I agree with TX Ron about going to 4.88's for 35 inch tires. I used several gear ratio calculators and in my opinion, this one was the best. http://www.grimmjeeper.com/gears.html The other calculators didn't give as much information. Use the drop down boxes to enter your transfer case and transmission ratios. When entering the tire size, be sure to click the appropriate bubble. (Either inch or metric) If your tires are metric sized enter the proper aspect ratio. (I.e.) 285/75/16. You will get a more accurate tire diameter. When you change the ring & pinions... don't try to save money and go cheap on anything.... It will wind up costing you more in the long run..
Good Luck! Feel free to shoot me a PM if you have more questions. I am no expert... but I will be happy to share the information that I got while doing my home work.
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Old 12-09-2013, 01:05 PM   #7
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Quote:
Originally Posted by 10851 View Post
Hey guys, I changed my ring and pinions to 4.56. This has made a huge difference in the way my FJ performs on the road and off. I actually picked up approximately 1-1.5 mpgs as long as I keep it 65 mph or below. 70-75mph I lose almost 2 mpgs. I live in a very mountainous area and this gear change has allowed the transmission to stay in a higher gear with better throttle response. The 3.73s were just too tall. I had East Coast Gear Supply build the 3rd members and ship them to me. They installed an ARB locker in the front. I got fantastic service from them and they were a real pleasure to deal with. Sooo... If any of you are riding the fence on a gear ratio change... do it.. You won't be sorry.. Be sure to do the proper break-in on the new gears.. ECGS has instructions on their website.
thanks for the info, I have a customer who is looking to upgrade his fj gears to compensate for the 285's he is running now.
ECGS has a great rep in the jeep community also, so glad to hear you have had a good dealing with them. I will let him know.
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Old 12-09-2013, 07:33 PM   #8
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Zilla,
If your customer has a 6 speed manual transmission, 4.10 ring & pinions will put his/her freeway rpms the same as my 4.56 with 5 speed automatic trans. The 6 speeds overdrive is 0.80 (6th) vs. my 0.72 overdrive (5th with the torque converter locked). The speed odometer gets itís information from wheel sensors, so there is no need to add a calibration box after R&P change. I don't know about the 6 speed manual trans. I hope this helps..
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