What do you all think the new engine is going to do to the price of used JK's with the little 6?

 

Makes me wonder... If I blow my 3.8, how much to upgrade to the newer one?

 

As with most things in life, you really need to own the final decision, so the follow is my own thoughts on why I ordered mine with the 4.10s. I went to my dealer and drove a Grand with the same engine and trans combo, which had 3.21s int he rear to help make my decision. It's the closest I can come to driving the new engine and trans until they hit the lot.

Lower gearing multiplies the torque available to the wheels at a greater rate. It also serves to have the engine run at a higher RPM at a given rate of ground speed. For me that meant an increase in torque that I want for towing my 3300# boat and trailer. It also means a decrease in mileage (most likely as I've not driven this combo yet). This being a second vehicle, and a toy for me, mileage was of no consequence.

I'm not so old, 39, but I tend to own vehicles only a short time, meaning I've owned and driven lost of vehicles. I based my decision on my years of experience and the large number of vehicles I've driven over my life. I feel I have a good idea how this engine and trans will behave for my use.

Also, I felt that if the gearing was too low, I would have no trouble swapping the axles with another owner who has lifted and installed bigger tire and now wants lower gearing.

If I were driving the new JKU daily, and not towing anything regularly, I'd have gone with the 3.73s based on the experience and calculations I've done.

 

SDbaja and Jim M thanks for the excellent insight. Both of your comments were what I was mostly thinking. Anyone else with opinions since it seems like there's lots of debate on whether to go to 4.10 or not.

 

Yep,,, it's anybody's best quess at this point,,, BUT I know I had 3:73's on mine and went to 35" tires with aftermarket bumpers and lift and other weight gaining mods and wasn't OVERLY happy with the 3:73's any longer. I COULD have lived with it but went with 5:13's and went back to the happy with it feel again. With the Sahara D30 I couldn't go any lower up front but after driving the 5:13's I would have if I could have.
SO with that said, from what I am reading and I know I will go 35's,, aftermarket bumpers ect again I can only hope that the 4:10 might be good enough in the 2012 but I'm not betting on it. I bet I'll want 4:88's or even 5:13's again. I have a 2dr now and plan to go unlimited,, so even more weight. So for me why not at least go 4:10's from the factory and have a little hope anyway.

 

I will have 35's within 100 miles of ownership, 3.73 were put on for the stock tire size. Just like the 11's moving up to a bigger tire does not require a regear, but it is better, IMO. Dave at aev said that auto with 35's will be perfect with the 4.10's... I think they know more than most.

 

Here is a quote from Dave that makes me question this :

With the auto you'll probably want the 5.13s for 37-40
With the manual, 4.56or 4.88s I'm driving a manual with 37" Swampers and 4.11s and its perfect (Rubicon), The manual OD is really low.

dh

This was in a discussion about JKs with Hemi engines.........

 

I have to admit, this sounds like good advise.. I'll roll with what gearing comes on my 2012 Rubicon, pretty sure its 3.73. I do plan on a 2" lift and 35" tires later, but will see how it performs with all that installed BEFORE I make a gear change.. Dealer says the 22nd is my ship date from the factory. Just a couple weeks after that it'll be here..

 

This is regarding the 2012 Wrangler.



Different engines and transmissions will differ. The hemi is apples and oranges compared with the 3.8 and 3.6 6's.

 

I can confirm you can order the 4.10 rear axle ratio with an automatic. However, it showed up as a $50/$45 charge (MSRP/FWP) on my configuration. I haven't compared that (or any of the other prices) to what others had on their forms yet.

Dealer said 6 to 8 weeks for delivery.