The Mud Pit > Wrenching

DMR Offroad

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Magnum Opus:
I'm rolling 35x12.5 spaced 1.5 and on stock 17" rims.  From the chart with a manual tranny and the 3.6l I ought to be a little pepier than stock with the 4.56.  If I was an auto or was gonna go bigger than 35's I would have rolled 4.88, but the rig is a daily driver (with cross country trips likely) so I didn't want to go too deep.  Idealy I would have liked to have scrapped the D30 in the front and got a locked D44, but thats a lot of greenbacks for right now, and I wanted to get the drive ratio fixed before the roads got too messy this winter (jamming the beast into first to launch around a slow turn isn't going to work this winter)  All things in time.....and I can lock later (won't have to set up the pinions for that, just the carriers)

skibum:
I'm running 5.13's on 35's with a 6 speed manual transmission and the turd 3.8L. RPM's at 3000 doing 70 mph. Feel 4.88's would be a better choice for you because have a friend who installed 4.56's and now regrets not going to 4.88's. And he is also running the 6 speed and 3.8L.

Magnum Opus:
I considered 4.88 specifically, and decided on the 4.56 based on the fact that I do intend on several cross continental drives and did not want my gear spread being too tight.  I anticipate an improved power distribution for the overal build over stock, but I understand it will be a mild build for crawling.  If the rig was going to be built more crawl centric a deeper set would definately be wanted, but I am going to have to mute it's trail performance to protect the high end/fuel eco/long distance driveability.  I do have a plan that in the event I get the gear set with the right rpm spread to meet all my needs that a power adder would be the next step.  I have also considered that with the 3.6l the only power adder that will make a decent differential will be forced induction (gulp) and how expensive that is, and the fact that no appreciable power occurs with FI unless you are in the higher end of the RPM band.  It is a gamble, and an expensive one, but at the cost of driveability on the Interstate I am willing to take it.  Either way I will see improvements.  I am glad it is time to jump down that rabbit hole with this rig and see where it goes.

skibum:
Just be happy you don't have the 3.8L. The 3.6L has 80 more HP. A cold air intake set up will give you a slight HP and MPG increase But with a lot more noise. If you want real power then drop in a Hemi but all depends how deep your pockets are.

Magnum Opus:
I used to have an 07, was hands down better than the 88, but the old 4.2 did a great job of producing low end power.  I kinda miss those older rigs.  When Jeep went to the v6 it changed everything, both the 3.8 and the 3.6 build their power at higher RPM so the old build plans don't work anymore and that sucks.  Every time I drive my JK like I drove my YJ I have been disappointed, you gotta drop a gear and let that v6 scream to get anywhere near the advertised hp rating.  I wouldn't speak poorly of a 3.8 either.....I kind of miss mods that do something about power like headers and CAI, where on a 3.6, nothing happens unless it is gears and a supercharger.......get the wrong mix for you and you have an expensive mistake (10k).  Engineer it wrong with a hemi swap and you are back 20k!  Get the right mix for you and you have meanness set to music!

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