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Old 01-23-2005, 09:01 AM   #1 (permalink)
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klune to np231c

currently in the process of installing a klune in my 88 yj, already have taken the np231 apart once about three years ago and installed the advance adapters 32 spline output. since my yj is a 4 cyl I need to replace the input on my t-case from 21 to 23 spline so I dont have to use any more adapters. I was going to try to find a 23 spline input and install it in my case. but I was reading another post and am interested in the np231c with 23 spline input, heavier chain, cogs, etc. I also have mechanical speedo, and want to retain it, any input would be appreciated, what vehicle and year would most likley have the 231 c with 23 spline thanks
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Old 01-23-2005, 01:44 PM   #2 (permalink)
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i have a 23 spline input for sale $100 and i pay for shipping.
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Old 01-24-2005, 11:02 AM   #3 (permalink)
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Dont put any NP231 behind a klune.

Get a gear driven case.
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Old 01-24-2005, 11:22 AM   #4 (permalink)
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Quote:
Originally Posted by ashmanjeepXJ
Dont put any NP231 behind a klune.

Get a gear driven case.
I kinda agree.. The 231 planetary system is too weak for the reduction. It will break easy. If you are going to run a NP case behind a klune you need to build it out of a 241 planetary (6 gear instead of 3) and use a chevy chain and gears. By the time you get it together and strong enough and the h/d output and all, you are right there where an atlas would be in cost. (Unless you have all the parts laying around)

but then again, it is just an opinion
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Old 01-24-2005, 11:34 AM   #5 (permalink)
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Quote:
Originally Posted by GaryTJ
I kinda agree.. The 231 planetary system is too weak for the reduction. It will break easy. If you are going to run a NP case behind a klune you need to build it out of a 241 planetary (6 gear instead of 3) and use a chevy chain and gears. By the time you get it together and strong enough and the h/d output and all, you are right there where an atlas would be in cost. (Unless you have all the parts laying around)

but then again, it is just an opinion
You put a $50 ford NP205 behind a 4:1 klune and its about half the total cost of an atlas and has better gearing options.
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Old 01-24-2005, 11:49 AM   #6 (permalink)
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You put a $50 ford NP205 behind a 4:1 klune and its about half the total cost of an atlas and has better gearing options.
Another option...
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Old 01-24-2005, 08:45 PM   #7 (permalink)
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205 behind klune

I like this option, didn't even think about it, has anyone run this, what is the input spline count on the 205, and will it be able to be used with a flat crossmember, what about the speedo. thanks Marc
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Old 01-25-2005, 04:58 AM   #8 (permalink)
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I'm assembling this right now. The Ford 205 uses a 31 spline input. You can buy a universal speed senser from Napa part number:ECHVSS100 to reconnect you speedo. I hope to have a flat belly pan, and with the clocking of the Klune V, it *should* be rather simple.

My set up is going to be:5.0L/C6/Klune/205.
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Old 01-25-2005, 09:02 AM   #9 (permalink)
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Quote:
Originally Posted by GaryTJ
I kinda agree.. The 231 planetary system is too weak for the reduction. It will break easy. If you are going to run a NP case behind a klune you need to build it out of a 241 planetary (6 gear instead of 3) and use a chevy chain and gears. By the time you get it together and strong enough and the h/d output and all, you are right there where an atlas would be in cost. (Unless you have all the parts laying around)

but then again, it is just an opinion
Interesting. I was wondering about that. I was talking to the Klune engineer and he did not seem to be aware of issues breaking a 231 behind a Klune, but it seems reasonable to me. That is a lot of reduction in front of that t-case. I know JB conversions sells a beefy 231, but I have not shopped for cost....no doubt the 205 is waaayyy cheaper.

Are your comments tied to tire/motor size, or is it just not a good idea, even with 37s and the 4.0 motor?

The only issue I have with the NP205 is size and weight, but strength is really nice, is it not? As I think about it, the 2:1/4:1 combo would probably be more versatile than the 2.7:1/4:1 combo. Hmmm.
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Old 01-25-2005, 12:44 PM   #10 (permalink)
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Quote:
Originally Posted by mtroy
Are your comments tied to tire/motor size, or is it just not a good idea, even with 37s and the 4.0 motor?

The only issue I have with the NP205 is size and weight, but strength is really nice, is it not? As I think about it, the 2:1/4:1 combo would probably be more versatile than the 2.7:1/4:1 combo. Hmmm.
My comments are tied to having been inside lots of these t/cases and seen how the case is built and the stress that would be placed on the gears at the gear multiplication that we are talking about. With only 3 gears spread out at that kind of stress it would be real hard to hold it together in an aluminum case.

When I went to the v-6 and nv4500 and 38" sx's in mine, I did the T/case how I described to get it hold together better. It has been kind to me, but it is showing a lot of wear after 3 years of hard wheeling. I believe if I had not gone with the h/d planetary it would have come apart.
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Old 01-25-2005, 06:08 PM   #11 (permalink)
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klune to np205

Talked to julie at klune today, they do make an adapter for this setup to work, but recomended to stay with the 231,and go with the 23 spline input, and I already have the HD 32 spline output that she also recomends, this is considering the overall length, weight, and because I am also running the 4 cyl. If the 231 breaks, or if I eventually do the engine swap, all possible adapters are available for a reasonable price. She said they were unaware, of any problems with the 231 t case behind the 4 cyl and 4.1 klune. Since this setup is fairly simple, I will probably stick w the 231, but I will be on the lookout for the 435 to 205 combo is case any problems arise. thanks marc
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Old 01-26-2005, 12:16 PM   #12 (permalink)
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since i have a klune in my TJ i feel i can reply here, i used the bronco D20 case and the 4:1 klune and was able to reuse my driveshaft that i had with the 231 w/ SYE.

also be aware that if you buy a 21 spline input on a KLUNE the only other option is a 23 spline input, i know this cause i just e mailed Julie about swaping tranny's.

oh and i would never go back to only having two speeds again after having 3.

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Old 01-27-2005, 04:22 PM   #13 (permalink)
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klune input

I also talked to her about it, if I were to do the 4.3 swap to 700r4, to klune, to 231, you send back the box, tell them what combination you will be running, and they will change the input so that you can mate it to the 700r4, cost being around 200.00, thats a pretty good deal, considering the cost new. just thought I'd relay the information.
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Old 01-27-2005, 08:04 PM   #14 (permalink)
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A crawler in front of a 231 is fine for a 4cyl. Probably a little iffy behind a 6cyl though.
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Old 01-27-2005, 09:01 PM   #15 (permalink)
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sorry, meant to say 4.3 to 700r4 to klune to 205.
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Old 02-21-2005, 03:53 PM   #16 (permalink)
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Quote:
Originally Posted by GaryTJ
I kinda agree.. The 231 planetary system is too weak for the reduction. It will break easy. If you are going to run a NP case behind a klune you need to build it out of a 241 planetary (6 gear instead of 3) and use a chevy chain and gears. By the time you get it together and strong enough and the h/d output and all, you are right there where an atlas would be in cost. (Unless you have all the parts laying around)

but then again, it is just an opinion
I just got a Np241 Rock Trac Rubi t-case. Can this be put behind the 4:1 Klune? I know I will have 4:1 in both cases and it isn't that relevant for my auto XJ on 37's with 5.38 hp 44/9" 35 spline 5.43 gears, but just wondering. How much stronger is the Rubi case than the stock np231? How much weaker is the Rubi t-case than the Atlas 2?
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Old 02-21-2005, 04:15 PM   #17 (permalink)
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I have a Klune and Ford 205 in my YJ. You can have a flat belly, but you will need to cut the shit out of your floorboard on the drivers side. This is because of the frame mount boss the 205 has. Mine is clocked up so much that the boss hits my seat mounts on the drivers side. No big deal however.

My overall case length difference with the Klune and 205 was only 1.5" longer than my 231 with a SYE installed. I do not need a speedo so no help there.
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Old 02-21-2005, 07:17 PM   #18 (permalink)
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Quote:
Originally Posted by bigredjeep1
I just got a Np241 Rock Trac Rubi t-case. Can this be put behind the 4:1 Klune? I know I will have 4:1 in both cases and it isn't that relevant for my auto XJ on 37's with 5.38 hp 44/9" 35 spline 5.43 gears, but just wondering. How much stronger is the Rubi case than the stock np231? How much weaker is the Rubi t-case than the Atlas 2?
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Yes you can put a Klune behind your 241. And why would you go with a 4:1? They also make a 2.7 so you would then have the best of both worlds.
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Old 02-27-2005, 12:31 AM   #19 (permalink)
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Quote:
Originally Posted by GaryTJ
I kinda agree.. The 231 planetary system is too weak for the reduction. It will break easy. If you are going to run a NP case behind a klune you need to build it out of a 241 planetary (6 gear instead of 3) and use a chevy chain and gears. By the time you get it together and strong enough and the h/d output and all, you are right there where an atlas would be in cost. (Unless you have all the parts laying around)

but then again, it is just an opinion

Hell I picked up my 231HD new for 925... not really atlas territory
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Old 02-27-2005, 12:57 AM   #20 (permalink)
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Hell I picked up my 231HD new for 925... not really atlas territory
Sell it, U can get a 241 Rock Trac Rubicon case for about that. I just picked up 1 with 5K miles for $1,037 shipped and am going to run it in my 91' XJ with hp44/9" full width axles. What did U get the 231 HD from Advanced Adapters? Check out this on the 241 to 231 comparison:

http://www.rubiconowners.com/TransferCase.html

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