Originally Posted by jeepguy8888
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.