jeepoch
Well-Known Member
- First Name
- Jay
- Joined
- Nov 13, 2019
- Threads
- 1
- Messages
- 952
- Reaction score
- 2,689
- Location
- Longmont, CO
- Vehicle(s)
- 2019 JL Wrangler Sport S 3.6L Auto 2 door, 2.5" lift, 35s
Randy,The information you presented is EXCELLENT--Thank you! Please forgive my question. I should probably know the answer but I am confused about when to use 2H in a Rubicon 392.
I literally just picked it up at dealership yesterday. The salesman told me to leave it in 4H auto for normal highway driving.
Other less robust (also now recognize wrongly named) 4WD vehicles I've owned were normally driven on paved roads or highways in 2WD. If inclement weather or slippery conditions existed I'd always shift into 4WD.
My assumption is that less horrible gas mileage might be achieved in 2H?
What is your advice as to normal roads, dry conditions? 2H or 4H in Rubicon 392?
Thanks for your great comment!
You lucky duck. The 392 has the best transfer case found in any Wrangler. My lowly Sport could only drool over what you have.
First off, your 392 and most Rubicon's comes standard with the 'Rock-Trac' Transfer case which hides the fact that you have 2WD. It instead has Auto/Partial 4Hi. In this mode the transfer case automatically selects either 2 or 4WD based on any wheel slip. On dry pavement it acts just like any AWD system and provides power to just a single axle. However, if it detects any difference in rotational speed on any of the four wheels it silently and automatically will select 4Hi (power on both axles) for you, no selection or interaction required.
Recall, you still have open diffs until you manually engage your lockers, but any of your 4 wheels can automatically be powered without you ever thinking about it.
For the rest of us poor souls with just the Select-Trac transfer case, we have to shift from 2Hi to 4Hi manually. So you can think of your vehicle has having not only an automatic transmission (which by the way is also one of the best on the planet) but also an automatic transfer case as well.
You however like the rest of us, need to still select 4Lo in specific conditions which warrant the lower gear ratio. But this too the Rock-Trac rules. It provides a much lower 4.0 : 1 ratio to our piddly 2.72 : 1 gearing. This gives you even more torque when crawling over the tallest of boulders (likely like Super-Man, in a single bound).
Enjoy your system. I'm jealous as hell.
Yet, I hope you wave to me on some high-altitude mountain pass here in Colorado sometime. It's amazing how capable my 2 door lifted Sport on 35's really is. Someday I'll hit the lottery and be able to afford something with lockers.
I can dream... You can just enjoy.
Regards,
Jay
Sponsored
Last edited: