For 33’s with a 4.2 that has a decent ignition system, 4.56. It’s got a bit more torque than the 4.0 if it runs properly. For the 4.0 I say 4.88 for 33’s. But if the 4.2 revs good, 4.56 will work well for 33’s.
You're not taking into account the variables that make the differences. The YJ auto for one thing doesn't have a 5th gear so you immediately have to compare to 4th gear on a manual. This guy has what looks to be 33's, maybe 35's, but looks like 33's. Those are heavier and larger than your 31's. Then consider the fact that he very likely has 3.07 gears, which have 14% less mechanical advantage than 3.55 gears. Add that up and throw him in 5th gear and it is abysmal performance compared to yours.
Yeah a big part of that is the noise. The 4.0 is loud, so revving it is quite audible. Especially the clutch fan. Geez, that thing moves a lot of air and is proud of doing so. Part of it is just the general condition of the engine, but most of it is just the noise. I can rev mine all day long and it works just fine. Not sure about your mpg sitch, but I've driven mine at 65 in 4th gear (4.10, 31's, 3150 rpm) and I can easily still get 17 mpg doing so. At highway speed it's not even loud doing that.
Yeah that's another problem, on a flat road with pedal all the way down max speed is around 65. Could be the big tires and stock gears and crappy carburetor. And with the gears you suggested is that just for the rear or front or both?
It has to be for both or else you’d blow up the transfer case in 4WD.
I don’t understand why people over there in the TJ world are still only gearing Rubi’s on 33’s to 5.13. They should go to 5.38 and IMO, anybody wanting 35’s needs to swap lockers and run 5.89. Of course, Rubi only for that to work. Non Rubi 42RLE are still screwed.Just be grateful you don't have a 42RLE automatic that was in the later TJs. You can gear those as deep as you want and they still suck
Mine with the 42RLE and 35s with 5.38 gears still sucked ass!
Not true. It's just a dana 44 like anything else. The factory lockers are the problem which is why Revolution specifically developed 5.38 for them because those lockers require a thick cut gear. Get rid of the factory locker and run any other locker with the carrier designed for 3.92+ gears, and then 5.89 can be installed to those carriers/lockers. The thing is, this can only be done on a TJ Rubi with factory axles, since it's the only TJ with 44/44 setup, and both factory lockers have to be gotten rid of.
I mean it would be expensive since it requires two lockers and both Eaton and ARB will be 900+ per axle, not to mention the air compressor on an ARB. Factory all that in with the price of the gears and it gets expensive, but there are indeed 5.89 gears straight from Rev that fit those axles with different carriers. Rev does not say "made for Rubicon TJ" because they are not. They are just normal Dana 44 5.89 gears like anything else that fits a TJ Rubi, only once the factory lockers are gotten rid of.