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Old 03-13-2012, 10:09 PM   #31
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I have 3.21's and frankly its fine. I get great milage, no issues with power and I tow my 14 alu boat everywhere. Whats not to like?

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Old 03-13-2012, 10:17 PM   #32
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Thanks for all the info!!!

I don't know if it's the 3.21 or 3.73 my guess order was modified to 3.73, however it was already in d1 status when I made the request.

Either way ill take what it has based on the info here ill be ok with either.

Had a tj 2003 manuel with the4.0 and I found it moved well for a jeep never lacked power. When I soldiers last year I was ready to pick up the 2011. Then I read they were changing the engine so I decided to postpone.

Friday its ready for me, and can't wait. Just wanted to assure myself either 3.21 or the 3.73 I would still be happy

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Old 03-13-2012, 10:18 PM   #33
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My experience with 3.21 and 3.73

Quote:
Originally Posted by jeepguy8888 View Post
Just got a call from my dealer my Jeep is ready for pick up on the 16th. I made a modifcation late in the order from 3.21 to 3.73 however I don't think the modification was done in time for the build. So I am expecting the 3.21.

Can anyone let me know what positives I can expect? I don't plan to tow. Off-Roading yes but I will keep the jeep stock. No Lifts and not planning to get bigger tires in short term and long term.

Is there any good points to having the 3.21?
I can tell you my experience with 3.21 and 3.73 in a 2012 6 speed. I purchased a new 2012 on 12/31. I ended up going with 3.21s as I thought it would get better gas mileage as I do a lot of highway driving. I didn't know about these wrangler forums until I started researching why my wrangler wouldn't maintain 75-80mph in 6th on highways in Kansas. I would either have to downshift and run up RPM or go over 85 MPH to keep the RPM in a range where there was adequate torque. I was quoted $3,500 to change the gears by the dealer (and it would void the axle warranty). My dealer let me take a 3.73 on a 140 mile round trip (my commute) and I got better gas mileage with the 3.73 as I could keep it in ECO mode the entire trip. Not much better, but not worse. Fortunately, I had a great dealer that told me it would be a lot cheaper to simply trade the first 2012 in on another one. They worked me a good deal and ordered me a 2012 with the 3.73 (I added ltd. slip while at it). They let me drive my first 2012 during the 6 weeks I waited. That saved my bacon. I get reimbursed for mileage, so my out of pocket (after mileage reimbursement) to do the trade in was negligible. I am much happier with the 6spd with 3.73. It is quite a bit quicker off the start and rolls at 75-80 in a good RPM range for highway use (up low hills or into wind). On a flat highway, the 3.21s worked fine, but once you introduce hills or wind, there isn't enough torque to maintain speed or accelerate as well as I wanted. I would have thought about going with 4.10s if it was available (I didn't want to go up to a Rubicon).

I want to be able to tow and my 2 door with 3.21s only had a towing capacity of 1,000lbs per the manual. The other positive about the 3.73s is that it is easier to drive for my wife. The 3.21s took a little more clutch/gas work.

The one positive I can say is that when I hit about 4,000 miles, the 3.21s felt a lot better than it did in the beginning. It was a lot more tolerable after I put at least 3,500 miles on that motor as it seemed to run better after that break in period.

I don't think the 3.21s are horrible, but I am definitely happy I traded mine in for the 3.73s. That is only my 2 cents, but in the last 3 months, I have owned both. I haven't put nearly as many miles on the 3.73, but I think it will only get better once the motor is broken in.

All of that being said, this is a 2nd vehicle for me, so I won't drive the 2nd new one on a daily basis. Take all of that for what it is worth, but thought I would share my experience.
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Old 03-14-2012, 12:16 AM   #34
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A 3.6 with a 3.21 used on a daily driver is probably fine, want to rock crawl, put in the Rubu's tcase and go from a 2.72:1 to 4:1. But I'd just drive it first and see if you really feeal any need (on streets or trails) to regear.
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Old 03-14-2012, 12:27 AM   #35
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I did a lot of research before I bought mine. I have the Manual 6 speed with 3.21s. I also have the 16 inch steelies with 29 inch tires (which I know I'll get flack for, but I don't plan on changing them any time soon because they are uber quiet and ride great!)

In any case, I really like the 3.21s. I get great gas mileage, the thing will REALLY move, has no problem going fast on the highway, will jump easily and quickly from 60 to 80 mph on the hwy without dropping a gear. It shifts like a dream (for a 4x4). It is quite possibly the perfect city Jeep!

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