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post #1 of 16 Old 02-22-2015, 07:05 AM Thread Starter
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Gear Ratio Question

New JK owner here! Been reading up on the necessary gear ratios for my setup. I have a 2010 Sahara 4 door unlimited. 3.21 gear with 4 inch lift and 35 inch tires. I'm not complaining too much on performance because I am comparing to my 97 wrangler and that thing was sluggish. I mostly drive highway miles and it does become sluggish around 65-75 mph. My big question is if I stay at 3.21 does that do any damage to the vehicle or is this mostly a change needed to improve performance and gas mileage? If I do decide to go for it, anyone know of a great place in the Philadelphia area? Cost? Which ratio? I am thinking 4.1. Thanks!
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post #2 of 16 Old 02-22-2015, 07:13 AM
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Not from Philly so I can't help there. I am planning on putting 4.88s in my 2009 JKU. I am running 35's that are actually around 34". Most of the guys on here will say 5.13 but if you are mostly highway I'd say 4.88s.
Check these charts.
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post #3 of 16 Old 02-22-2015, 07:16 AM Thread Starter
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Sorry...forgot to add that this is a manual transmission (6 speed)
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post #4 of 16 Old 02-22-2015, 07:19 AM
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Manual or auto trans? It needs to be done regardless but if you have the manual you can probably wait a lil longer with less damage. The auto trans in the JK's is fragile as it is, your combo will not only add more heat but also wear out the bands and clutch packs inside the trans. If you have the manual then it's a lil more tolerable but will still add wear and tear to the clutch. You geared it up with the big tires and stock gears so now it's like starting off in 3rd gear instead of 1st. More strain on the drivetrain. Not trying to scare you but it does need to be re geared. Sooner rather than later imho.

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post #5 of 16 Old 02-22-2015, 07:23 AM
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Yes the 4.88's are fine for 35's i would only do 5.13's if you have any plans what so ever about going bigger than 35's. Remember the front D30 will need the bigger ring gear carrier so factor that in with the cost.

2008 Jeep JK Unlimited Rescue Green NSG370
RK 3.5 X Factor mid arm
37x12.50 Nitto Trail Grapplers
PSC BFH trail stinger
PSC narrow fenders

A lot more to come very soon!

Last edited by Taco08jk; 02-22-2015 at 07:46 AM.
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post #6 of 16 Old 02-22-2015, 07:28 AM Thread Starter
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What kind of cost am I looking at? Is there a list on the forum of good places to get jeep upgrades/repairs?
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post #7 of 16 Old 02-22-2015, 07:33 AM Thread Starter
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Also, i have dana 30 in front and 44 in rear
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post #8 of 16 Old 02-22-2015, 07:39 AM
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600$ should be close to getting you the gears, install kits, and new front carrier. Then labor( if your not doing it yourself ) will be between 700$ and 1200$. These labor prices are typical for my area (georgia). I would call around to different shops and get quotes, see what the difference is between them furnishing the gears and you furnishing them. I'm not from PA so I don't know the shops up there but I'm sure somebody from PA will chime in and suggest a place.

2008 Jeep JK Unlimited Rescue Green NSG370
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37x12.50 Nitto Trail Grapplers
PSC BFH trail stinger
PSC narrow fenders

A lot more to come very soon!
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post #9 of 16 Old 02-22-2015, 07:47 AM
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Yes D30, I said D35 earlier but I fixed it. The D30 will need a new carrier.

2008 Jeep JK Unlimited Rescue Green NSG370
RK 3.5 X Factor mid arm
37x12.50 Nitto Trail Grapplers
PSC BFH trail stinger
PSC narrow fenders

A lot more to come very soon!
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post #10 of 16 Old 02-22-2015, 08:16 AM Thread Starter
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Quote:
Originally Posted by Taco08jk View Post
600$ should be close to getting you the gears, install kits, and new front carrier. Then labor( if your not doing it yourself ) will be between 700$ and 1200$. These labor prices are typical for my area (georgia). I would call around to different shops and get quotes, see what the difference is between them furnishing the gears and you furnishing them. I'm not from PA so I don't know the shops up there but I'm sure somebody from PA will chime in and suggest a place.
Would you happen to have links to each of the parts above that you recommend? I am not good mechanically and will need someone to do this for me. I would love to have some material before I make the calls in order to speak knowledgeably about it. Thank you so very much for all the help.
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post #11 of 16 Old 02-22-2015, 09:07 AM
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I'm not real computer savvy about posting pics or links, maybe someone else can post the links for you. I know northridge4x4 has it all. You need the ring and pinions for front and rear, master install kits for each axle, and the carrier. The carrier is what the ring gear bolts to.

2008 Jeep JK Unlimited Rescue Green NSG370
RK 3.5 X Factor mid arm
37x12.50 Nitto Trail Grapplers
PSC BFH trail stinger
PSC narrow fenders

A lot more to come very soon!
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post #12 of 16 Old 02-22-2015, 09:46 PM
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Unless you are going to install the gears yourself, you are better picking a good shop and letting them supply the parts. If something goes wrong you have one throat to choke. Go with the 5.13 gears. The 3.8 needs all the help it can get.
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post #13 of 16 Old 02-22-2015, 10:16 PM
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short term : superchips flashpaq
long term ( and better ) : regear to 4.88s or 5.13s .
+/- 2 grand if you use Google and find you some good deal on the parts mentioned + someone that knows wtf they are doing installation wise.
Find out where in your region guys that wheel take their rigs to via local forums or the regional forum for your part of the country on JKO.
You can get decent deals at Northridge 4x4 or Omix-Ada tho' I would start by asking Marcus at River City OffRoad ( a jkowners vendor and great guy) what he can do for ya....get parts then find someone to install and vroom vroom


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post #14 of 16 Old 02-23-2015, 05:10 AM
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I have a 2008 JKU with a manual trans and went with 4.88's. Hindsight 20/20 I would be happier with 4.56's as it's overgeared like crazy--I can leave in 2nd with no problems and it will accelerate uphill in 5th/6th depending on the grade. 70mph cruise at just under 3k rpm in 6th on the interstate, 10mpg at best. I'm going to end up on 37's (minimum) just to get the gearing closer to ideal. You'll have the same results as we aren't that far apart and our terrain/landscape is basically the same.
I can't tell you about Philly shops as I don't know, but I hear good things about River City Offroad and I've dealt with Mt Zion Offroad here in York (they did my gear swap and I have no complaints about their work, the gear ratio dissatisfaction is completely on me as that's the ratio I chose going by the charts above). MT Zion is currently running a $1500 regear package, everything included.

Last edited by '51plymouth; 02-23-2015 at 05:12 AM.
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post #15 of 16 Old 02-23-2015, 04:55 PM Thread Starter
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Found some Philly shops on another forum here. Called about 3 places and one ended up about 1300 all said and done. Suggested I do 4.88. I had one place quote 2500 and another 1700
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post #16 of 16 Old 02-25-2015, 07:56 PM
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1300 sounds right, 2500$ and you might as well bend over and take it while your there. Thats just rape.

2008 Jeep JK Unlimited Rescue Green NSG370
RK 3.5 X Factor mid arm
37x12.50 Nitto Trail Grapplers
PSC BFH trail stinger
PSC narrow fenders

A lot more to come very soon!
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