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Topic Review (Newest First)
05-02-2012 12:01 AM
jim9006 UPDATE: Axles installed. 42RLE / NP231 4.56 w/32" JK wheels, SS SYE (tom woods) and the rig drives perfect. I've only driven it to work so far. Got it up to 50mph with no vibes and rpm at aprox. 1900. Looks like the 4sp OD by pass button is no logger required. I'm like'n it.
03-31-2012 12:06 AM
GoldenSahara00
Quote:
Originally Posted by InvertChaos

Sure, ill try to dig one up. I just kind of have them memorized from Jerry B's recommendations. For the I-6, 33s, and 3 speed its 4.11, 5 speed is 4.56 (what I have), 4 speed is 4.88. If someone has a 4cyl its just a step up for each one, and another step up for each increase in tire size.
What does this teach us? The 32rh was the best transmission ever! as far as stock tjs.
03-30-2012 05:38 PM
InvertChaos
Quote:
Originally Posted by jim9006
Invert,
Can you supply me with the source of your information on the gear recommendations for the 42rle? I think your right. I'm going to have to install the rear axle and try it out.... Now I just need to get some 31" wheels.
FYI: I will report back with my findings for future archives.
Sure, ill try to dig one up. I just kind of have them memorized from Jerry B's recommendations. For the I-6, 33s, and 3 speed its 4.11, 5 speed is 4.56 (what I have), 4 speed is 4.88. If someone has a 4cyl its just a step up for each one, and another step up for each increase in tire size.
03-30-2012 05:10 PM
jim9006 Invert,
Can you supply me with the source of your information on the gear recommendations for the 42rle? I think your right. I'm going to have to install the rear axle and try it out.... Now I just need to get some 31" wheels.
FYI: I will report back with my findings for future archives.
03-30-2012 03:48 PM
InvertChaos I would imagine it wouldn't be too terrible seeing as 4.88 is recommended for 33s on that transmission, it would make sense that 4.56 would be alright for 31" tires. No one has any personal experience because most people on 31" tires aren't looking to swap axles or have plans to go larger. You seem to have plenty of mechanical experience if you can regear a diff, so either play with some rpm calculators or swap them on and take a test drive.
03-30-2012 03:14 PM
jim9006 Hello All,
So what I see here is that no one has tried the 4.56 and the 42RLE automatic. I know 4.56ís and 31Ē tires would never work on a normal (insert reality land here) jeep. But the 42RLE has a 0.69 OD for a 4th. I believe the earlier auto trannies were 1.0 in top gear. Thatís why Iíd like to hear from someone whoís been there / done that. Donít get me wrong guys, I love ya all and such but youíre filling my thread with crap. Oh and for those who keep asking me to trade/sell/whatever. Please stop. Iím perfectly capable of regearing my own axles as I have done it many times, so if it comes to that Iíll regear them before I sell them. Iíve asked these questions because the 4.56ís are already in there and ready to go and if this OD thing works as the charts say it should (somewhere between 2400 and 2700 RPM at 70mph) Iíd have a totally sweet setup for both off and on road and still have the option of not regearing when/if I ever go bigger on the wheels.
03-30-2012 12:08 PM
onejsmith
4.56 and 31s

Quote:
Originally Posted by jim9006 View Post
Just picked up a set of axles (d30/rubi d44) with 4.56 gear sets. Problem is a 31" tire is as big as i'm going - I'd like to know who's run this combo and what was it like on the freeway, gas milage, etc.... And NO I'm not going 33"'s ever! (for now)... Oh, and I have an '06 tj with the automatic OD and 4.0l
I will admit that I have no direct experience with the ratio/tire size you are asking about... but this might give you something to think about.

The TJ Rubicons came stock with a set of 31s and ran the 4:10/1 ratio. Some of the others have mentioned your RPM will be high on the road with the 4:56 ratio. They are absolutely correct. Your mileage will suffer some too. You will be out of the "sweet spot" for HP and torque both on and off road. Off road you may not care as the slower crawling ratio will be to your advantage.
If you care at all about the mileage, change the gears to the 4:10s.
Happy Trails.
03-30-2012 04:15 AM
BroderickMi I’m not so sure the RPM will be out of whack as bad as most think.
03-30-2012 02:02 AM
netlohcs anyways, to add my opinion - if "freeway" is involved at all, don't do it. It would (in my opinion) be great for blasting around town though. Are you getting sick of the "wanna trade, tee hee" posts yet?
03-30-2012 01:54 AM
somis Ive got a 5 speed manual with 31's and the 4.56's but a D35 in the rear. It is terrible on the freeway but does great on the trail
03-30-2012 12:42 AM
NickDanger Um, how did I miss a Rubi D44 and D30 with 4.56s on craigslist (assuming you picked it up from craigslist)

If you decide to get rid of them for any reason, let me know, I'm actually in WA unlike these other guys haha
03-29-2012 10:13 PM
GoldenSahara00 That's way too deep IMO. Why get the axles is what I'm wondering. Want to trade?
03-29-2012 10:10 PM
doclouie I want to say at 75 MPH I am at 3750 RPM with 4.10 gears and 31" tires. That is with the 3 speed tranny.
03-29-2012 09:38 PM
netlohcs I ran nearly the same setup (I had 30s) for a while, but I had a manual transmission, so I'm not sure that my experience would apply to you.
03-29-2012 07:50 PM
TJspeed
Quote:
Originally Posted by oIIIIIIo View Post
Nice, I am at 2900-3000 rpm at 70mph. Mine is 3spd auto with 4.10 gears.
ouch.. my 5 speed with stock 3.73 with 33''s doing 83MPH (speedo says 75MPH) im at 3000RPM in 4th gear 5th is like 2500 or something.
03-29-2012 05:11 PM
oIIIIIIo
Quote:
Originally Posted by jim9006 View Post
No offence but I’m looking for those who have run that combo.. I believe you that the gas mileage will most likely suck but I’m not so sure the RPM will be out of whack as bad as most think. I have the latest 4sp auto with OD. This just might work out. Oh, and yes I have a Dana 35 that I’d be more than happy to sell you.

No offense taken...

I have a rubi 44 in the rear also
03-29-2012 05:09 PM
oIIIIIIo
Quote:
Originally Posted by jim9006 View Post
Thank you sir, that was a huge help! Looks like about 2400 rpm at 70 when using my OD. Whoo Hooo, that will work for me especialy since no re-gearing required.
Nice, I am at 2900-3000 rpm at 70mph. Mine is 3spd auto with 4.10 gears.
03-29-2012 04:50 PM
jim9006
Quote:
Originally Posted by Sccafire View Post
Use this link. It will tell you the numbers you are looking for.

Gear Ratio Calculator
Thank you sir, that was a huge help! Looks like about 2400 rpm at 70 when using my OD. Whoo Hooo, that will work for me especialy since no re-gearing required.
03-29-2012 04:38 PM
Sccafire Use this link. It will tell you the numbers you are looking for.

Gear Ratio Calculator
03-29-2012 04:12 PM
BLK00TJ
Quote:
Originally Posted by TJspeed View Post
i got a D30 and D44 with 3.73 thats what you need. wanna trade?! lol
Dang it! You beat me to it. Probably closer anyhow
03-29-2012 04:11 PM
TJspeed and air locker
03-29-2012 03:58 PM
jim9006 There is another thing about the rubi d44 that was as much a motivator as anything. And thats disk brakes! So there will be no gett'n rid of my new rubi d44.
03-29-2012 03:50 PM
TJspeed no no no lol you give me the rubi 44 and i give you my 44. lol
03-29-2012 03:34 PM
jim9006 For the D35? ... Yeah!
03-29-2012 03:25 PM
TJspeed i got a D30 and D44 with 3.73 thats what you need. wanna trade?! lol
03-29-2012 03:18 PM
jim9006 No offence but Iím looking for those who have run that combo.. I believe you that the gas mileage will most likely suck but Iím not so sure the RPM will be out of whack as bad as most think. I have the latest 4sp auto with OD. This just might work out. Oh, and yes I have a Dana 35 that Iíd be more than happy to sell you.
03-29-2012 02:14 PM
oIIIIIIo The 4.56 gears with 31" tires are way too low of a gear for the size tires. Your RPM will be too high and will not save you any gas.

Wanna sell the axle to me?
03-29-2012 12:31 PM
jim9006
4.56 and 31" tires

Just picked up a set of axles (d30/rubi d44) with 4.56 gear sets. Problem is a 31" tire is as big as i'm going - I'd like to know who's run this combo and what was it like on the freeway, gas milage, etc.... And NO I'm not going 33"'s ever! (for now)... Oh, and I have an '06 tj with the automatic OD and 4.0l

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