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Old 12-15-2007, 12:40 AM   #1
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Talking 3.21 gears for 2008 Wrangler X

Help I am looking to buy a 2008 Wrangler with a 6 spd. The only concern I have is the 3.21 gears. I am not so sure about these. Seems like it will struggle going uphill. This is about the only thing holding me back from buying one. How hard is it to change gears. What gear ratio would be recommended. I prefer 3.73. Is there really a difference. How about 4.10 gears. There is a new 2007 with 4.10 gears available as well. It has the automatic transmission.

Any help would be greatly appreciated.


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Old 12-15-2007, 12:53 AM   #2
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The six speed has the 3.73s as an option.....ya can gey em by themselves or with the tow package.....swappin gears is not a hard job if ya have the tools and the knowledge.....youd know that better than I ......I can rebuild a rearend in 2 hours.....I wouldnt even attempt ta explain it on a forum tho......g

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Old 12-15-2007, 12:57 AM   #3
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I have argued with my local dealer until I was blue in the face about the 3.73s. He said I have to order the tow pkg and I told him otherwise. According to jeep.com you do not have to order tow pkg to get them. He won't listen!!! About how much do gears cost and how much to pay to have installed. I am not the most mechanically inclined person. I am great at taking apart but it's those extra parts when I put it back together that gives me fits!!!!
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Old 12-15-2007, 10:09 AM   #4
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An important factor into which gears to run is what size tires are you going to end up running? If you are going to 33" or 35" tires you will need lower gears no matter which ones you get from the factory unless you go with the 4.10's and the automatic. I personally like the auto, I have had both and feel the auto is the only way to go...

Having gears put in by a shop should run around $1000 to $1200.

Just get the Jeep NOW and worry 'bout modifications later...
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Old 12-15-2007, 12:45 PM   #5
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I charge 5 hours for a gear change on a 44.....or a 30 or a 10 bolt Gm or an 8- 3/4 etc..........add the price of gears ,pinion bearings,side bearing RTV and lube.....

Now that Im thinkin bout this in order ta run gears bigger than the 3.50 range youll need new carriers as well.......think 400-500 or so for factory open or traclock carriers.......the tow package is like 300 bucks.....Its waaaaaaaaaaay cheaper ta get it from the factory.......g
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Old 12-15-2007, 03:01 PM   #6
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Quote:
Originally Posted by jdrogers View Post
An important factor into which gears to run is what size tires are you going to end up running? If you are going to 33" or 35" tires you will need lower gears no matter which ones you get from the factory unless you go with the 4.10's and the automatic. I personally like the auto, I have had both and feel the auto is the only way to go...

Having gears put in by a shop should run around $1000 to $1200.

Just get the Jeep NOW and worry 'bout modifications later...
The tow package is only $295,, cheaper to get that than changing later.. But, yes, you should be able to get the 3.73 as a $50 option.. Problem is not what the factory will do, but what the dealers ordered. Not much coming out of the factory right now so you pretty much have to chose from what is out there.

But truthfully unless you planning lift and bigger tires right away you shouldn't have too much trouble, after all it is a 6 speed trans.. I generally shift 1st, 2nd, 4th, 6th when taking it easy on flat ground. I have the 3.73 but I also have the Unlimited 4 door.

I wouldn't go 3.21 on a 4 door unless it was 2 wheel drive, but then I wouldn't buy a 2 wheel drive Jeep.
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Old 12-15-2007, 04:46 PM   #7
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But i thought that installing gears by youself would void your warranty
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Old 12-15-2007, 05:34 PM   #8
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Well I done gone and done it. I bought my first Wrangler. I went with the auto with the 3.73 gears and a hardtop. Don't have it home yet but will get it home Monday morning. Thanx for everyone's help and input.
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Old 12-15-2007, 06:20 PM   #9
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Congrats on the purchase!!! Be sure to post some pics when you get your baby home.
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Old 12-15-2007, 09:05 PM   #10
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Just how much of a dog are the 3.21 gears? Would I be unhappy with them, the JK im considering does have the 3.21's....
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Old 12-29-2007, 02:52 PM   #11
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07 wrangler 3.72s

I'm curently running 33's on my 07 , 6th gear is out of the question unless your on flat ground and doing 70 plus. As far as gear changing , why bother with gears if u cant do diffs , witch seams 2 b impossible @ this point . I have contacted ox-lockers and they are looking @ tooling up as soon as they can justify the cost , so send those e-mails people . You will have 2 change front carrier if you plan 2 go lower then 3.70s .
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Old 12-29-2007, 03:01 PM   #12
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anthing u do 2 change the stock config will void your warrenty in clouding a tires
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Old 12-30-2007, 10:47 PM   #13
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Don't think the original question was answered in this thread... As i understand it and from what I can determine, the axle ratio of 3.21 is the number of turns required by the drive shaft to turn the axle one turn and that gear ratio (in the differential) is the most efficient (think fuel economy) if using a manual 6 speed tranny... I f you decide to go 4 speed automatic and/or the tow package, Chrysler recommends the 3.73 gear ratio and that will give you more power but use more fuel to go the same distance... If you want to install larger tires (remember the vehicle is now trying to go further on one turn of the axle) then a 4.10 axle may be required... In any event, the Delta between the 3.21 and the 4.10 axle ratio is about 22% of the total and I don't know if the fuel usage is the same... Perhaps someone can let us know about that... BC
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Old 12-31-2007, 08:57 AM   #14
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3.21 gets a little better gas mileage, but the gas mileage doesn't change much on any of the stock gearing. After all, once you get over 60mph aerodynamics is more important than gear ratio, and the Wrangler is the shape of a brick.

3.21 is only rated for towing to 1000lbs, the 3.73 is rated for 3500, big difference. The six speed manual will handle the higher gearing better than the auto so the 3.21 would probably be fine for non-towing and only mild off road, and keeping the tires under 33in with a 6 speed.
I personally do not like autos in anything.
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Old 12-31-2007, 10:33 AM   #15
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I bought the 2008, 6-speed Manual Wrangler X in November. After having driven it up hill, down hill, with a full load, without a full load, I have seen how the tranny needs a full 2,000 rpm between gears on level surfaces, and 2,500 rpm in an uphill situation under full load. (4 adult bodies).

Getting on the highway, in an uphill situation, I have found to be scary from 4th gear and up. I really need to build up speed in 4th as much as possible, because the change over to 5th and 6th will lag without the pre-shifting buildup in 4th.

Having said that, I'm not driving the Wrangler like it is a Ferrari. It ain't!!

-Soupy1957
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Old 01-01-2008, 04:12 PM   #16
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just pay the extra $50 and upgrade to 3.73s instead of wondering about the 3.21s
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Old 01-01-2008, 06:44 PM   #17
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Quote:
Originally Posted by Tommy3rd View Post
just pay the extra $50 and upgrade to 3.73s instead of wondering about the 3.21s
If they say they can find one with $50 3.73 upgrade, have them look for one with the $295 tow package, it also has 3.73.

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