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I love my 07 Rubi.
Sure the 3.8 blows, especially on 37 beadlocks, but 5:13 gears help, manual trans.
The 3.8 is pretty easy to work on and cheap. When it inevitably dies completely I'm going to swap a 4BT into it...
For how cheap 07-11's are vs 12-17s... you can put the savings into a 4BT swap fund and almost have enough if you can DIY.
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I agree. I have a similar setup, 37 beadlocks and 5.13's
I have an 08 JKU Sahara with the 3.8, I've owned it for a few years now and haven't had any mechanical issues.
I think the axles are a larger issue than the engine, especially if you intend to put larger tires and wheel it.. d30 has weak ring/pinion, axle tubes, C's the r44 in the Rubicon has a stronger ring/pinion but the same weak axle tubes, C's.
I built a Teraflex r44 housing with ARB locker, 5.13 gears and 35 spline rcv's for the front and got a smoking deal on a Teraflex CRD60 for the rear.
Factory brakes are also inadequate for larger tires and the added weight of real bumpers, etc. I swapped mine out for a rt twin piston big brake kit up front, teraflex big brake kit in the rear and upgraded brake master cylinder.. night and day difference.
My 3.8 only has 65k on it, whenever it goes I'll swap it out for a v8 or diesel..