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Old 02-07-2011, 01:43 PM
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Almost time for a new transmission,rubi swap?

I have a 98 sport i6 ax-15 5 speed
It pops out of first alot and grinds 3rd if I shift in a hurry or at high rpm
My question is is there a rubicon 6 speed with transfercase that will be a bolt up swap?
If so will my driveshafts need different flanges,rubi mounts?rubi skid?
What's needed and what year rubicon should I get parts from?
I want a rubicon 6 speed and 4:1 xfer case
Just weighing out the options for replacement
Will my sport clutch system work
Will a early rubi like an 03 work

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Old 02-07-2011, 02:00 PM   #2
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ive seen that a lot of ppl prefer the AX15... (but i guess we'll see according to the responses below)
Def in support of the rubi NV241OR swap... (may do this myself later)

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Old 02-07-2011, 02:02 PM   #3
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My 03 rubi is a 5 speed Idk when they went to a 6 speed maybe 06?
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Old 02-07-2011, 02:03 PM   #4
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My 03 rubi is a 5 speed Idk when they went to a 6 speed maybe 06?
I could be wrong but i think that ONLY the 05 and 06 LJ came with the 6 speed
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Old 02-07-2011, 02:07 PM   #5
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Originally Posted by KawiMonsterSahara

I could be wrong but i think that ONLY the 05 and 06 LJ came with the 6 speed
Really? So right now they have 5 speeds??
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Old 02-07-2011, 02:10 PM   #6
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Really? So right now they have 5 speeds??
Wait... sorry for any confusion i meant as far as the TJ generation....

(I had been looking into upgrading to a 6 speed and then realized i was better with the AX15)
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Old 02-07-2011, 03:57 PM   #7
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I bought my father a NSG370 6 speed out of a 4cyl jeep to replace his worn out '97 AX15 and learned the hard way that a 6 speed from a 4cyl will not bolt up to the 6cyl. If you do find one from a 6cyl, it will bolt up just fine.

If you're looking for the NSG370 / NV241OR combo, you'll need to find an 05-06 Rubicon.

And if you don't have the original Rubicon driveshaft, tom wood can make you one that mates to the harmonic balancer on the back of the T-case

Maybe insurance auctions would be a place to start....


EDIT:

It might just be easier to sell your current rig and buy an 05-06 Rubicon.
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Old 02-07-2011, 04:00 PM   #8
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I bought my father a NSG370 6 speed out of a 4cyl jeep to replace his worn out '97 AX15 and learned the hard way that a 6 speed from a 4cyl will not bolt up to the 6cyl. If you do find one from a 6cyl, it will bolt up just fine.

If you're looking for the NSG370 / NV241OR combo, you'll need to find an 05-06 Rubicon.
I could be TOTALLY wrong but wouldnt you just have to change out the bell housing from the NSG370 and get one that mounts to the 6 speed...
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Old 02-07-2011, 04:01 PM   #9
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Originally Posted by KawiMonsterSahara View Post
I could be TOTALLY wrong but wouldnt you just have to change out the bell housing from the NSG370 and get one that mounts to the 6 speed...
That is exactly what I thought. I was WRONG. The NSG370 does not have a removable bellhousing. You have to swap the guts into an entirely different casing. Novak conversions did it for us but was a giant PITA.
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Old 02-07-2011, 04:02 PM   #10
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ew... yeah ill stick with the AX
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Old 02-07-2011, 05:18 PM
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well Id love to sell what I have now and buy a rubi but I cant afford a note at this time

will a rubi transfercase bolt onto a ax-15,if so would I have to use a rubi skid?



It might just be easier to sell your current rig and buy an 05-06 Rubicon.[/QUOTE]
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Old 02-07-2011, 05:21 PM   #12
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man you have all kinds of good questions... only if Jerry B was on... WWJerryD.... this is over my experience level

ill try to find some info... otherwise
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Old 02-07-2011, 05:25 PM
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even though im not a hot chick it will get answered in due time
my goal as of now is since I have to rebuild/replace my ax-15 Id like a 6speed or a 5speed but Id like to consider spending a lil more to slowly make a rubicant
so if I can add a rubi tranny and xfercase with minimal effort now Id rather buy a set up once
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Old 02-07-2011, 05:26 PM   #14
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Ok i found this http://www.jeepforum.com/forum/f9/np231-nv241or-swap-79662/

"Should be a direct swap"

RECOMMEND doing a d44 swap (rear) and High pinion D30 (front) though...
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Old 02-07-2011, 10:06 PM   #15
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Mine is a 05 X with a 4.0 6speed. from what i understand 05-06 manual were all 6speeds
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Old 02-07-2011, 10:16 PM
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million dollar question....will an 05 tranny and transfercase direct bolt up to my 13 year old tj?
my main concern is the 6 speed,I can live without the 4:1 rubi case.I'll never need 4:1 anyway but if I can find a rubi set up for under $2000 Id go for it for the added clerance but then I need other parts for that.so it may be out of my budget depending on what fits what

I can build my jeep slowly into the Jeep I cant afford now
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Old 02-07-2011, 10:17 PM
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also what are advantages of a 6speed over a 5?
I assume lower ratios for more power
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Old 02-07-2011, 11:25 PM   #18
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theres really not a big enough difference... 5 speed gives you better capability off road cuz you have more to work with in each gear versus the 6 speed...
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Old 02-08-2011, 03:38 PM   #19
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Originally Posted by KawiMonsterSahara View Post
theres really not a big enough difference... 5 speed gives you better capability off road cuz you have more to work with in each gear versus the 6 speed...
I'm going to have to disagree with you here

Having had both the AX15 and the NSG370 transmissions, I like the 6 speed more. First gear is 4.46 vs 3.83 on the AX, which gives you a better crawl ratio no matter which T-case, or axle gearing you're running. Which is important for a manual tranny Jeep because you don't have the Torque converter working for you like in the auto.

Second through 4th are closely spaced at 2.61, 1.72, and 1.25, which is nice on and off road, 5th gear is your 1:1 and finally 6th gear is a numerically higher overdrive at .84 vs .79 which gives a non-aerodynamic Jeep with big tires and such a MUCH better overdrive. With the AX15, if there was even a small hill, I had to downshift. Not so with the 6 speed.

So IMHO, the 6th speed is a much much better manual transmission for the TJ, especially if you're lifted, etc.
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Old 02-08-2011, 03:52 PM   #20
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I think you have good points.

I do have to say that i still stick with what i say... .63 difference in first and a .05 for overdrive... "not a big enough difference"....

I looked at swapping for the 6 speed also and was almost sold on it til i compared the tranny's...

as far as lifted, im confident that a lil regearing will fix any of that... (which needs to be done regardless of the tranny)
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Old 02-08-2011, 03:58 PM   #21
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Originally Posted by KawiMonsterSahara View Post
I think you have good points.

I do have to say that i still stick with what i say... .63 difference in first and a .05 for overdrive... "not a big enough difference"....

I looked at swapping for the 6 speed also and was almost sold on it til i compared the tranny's...

as far as lifted, im confident that a lil regearing will fix any of that... (which needs to be done regardless of the tranny)

You're right. It's not enough of a difference to tear out your AX15 and toss it. But if your Tranny is shot and you need to replace it anyway, it would be wise to find a NSG370.

As far as gearing, If you have inappropriately geared differentials, the tranny isn't going to matter much.
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Old 02-08-2011, 04:01 PM   #22
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Y... But if your Tranny is shot and you need to replace it anyway, it would be wise to find a NSG370.

As far as gearing, If you have inappropriately geared differentials, the tranny isn't going to matter much.
DEF agree

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