NP 205 transfercase

[AM JEEP]

I was just wondering if anyone every changed there QT t-case for a NP205 that bolts right up to a TH400? I am going to be buying a NP205 and installing it hopefully with little or no custom work to it other than driveshafts. Well please let me know. thanks

[Frank in Norway]

The output shaft on the TH400 with the QT is special for this combo. So to make this work you will have to have the proper output shaft for the 205.
The easiest way to do it is to find a TH400/NP205 combo and use the shaft and the adapter from this.

[Crazy_Jeepman]

Thats right the Transmission would need to be completly disassembled and swap in the correct TH400 output shaft for the NP205. The gas tank in your J10 may also be in the way.

[AM JEEP]

ok thanks, if there is anyother adivse please let me know. My '78 J10 is going to be on a 4" suspension lift, and 2" body lift and running 35" MTR's. Would that set up and a NP205 cause my gas tank to interfer with anything?

[Crazy_Jeepman]

Well it will be close, I think it will be in the way, but it could make it.

[Marvin-fsj]

You shouldnt have any problems clearing the gas tank. I put a 203/205 combo in and it almost cleared. the 205 by itself should fit in front of the gas tank. If you plan on having someone else swap the tail shaft in the tranny plan on having it rebuilt. no one here would do it without rebuilding it. they tend to run about 350 to be rebuilt.

[quikclimber]

marvin...how is that 203/205 setup working for ya? anyone else do this? i like my QT, but i wish i had some lower gearing for the rocks and bouldery trails. what is the gear ratio or reduction in 205 and 203 low range? how hard is it to swap the shaft? did you have to change drivelines? u-joints?

[AM JEEP]

I was thinking that if I was not happy with the 205 low range I would do a 203 doubler as well. Do you have any pics on building this combo and replacing the tailshaft?

[Elliott]

Doubler info:
http://www.offroaddesign.com/catalog/doubler.htm

[AM JEEP]

Thanks very much for that link.

[Marvin-fsj]

Well if your thinking of doing a 203/205 you better be willing to do the work. I wasnt brave enough to do the tailshaft myself so there was 400 for the adapter and 360 for the rebuild. I then paid 1300 for the 203, the 205 the doubler and the shifters. The combo did not fit beside the gas tank. So i mounted a ford bronco tank half in and half out of the back( watching for ground clearnce. I did a spring over at the same time. The problem i have now is the driveshaft angle in the rear is almost too steep :( casing vibrations. When i am done i will be able to run same driveshafts front or rear. As far as power it is great more than i know what to do with. I idle up hills without any problems. If anyone wants details i will supply through emails. Knowing now what i know there are a few things i would have done differently. but not much.

[AM JEEP]

I would be interested in info, please email me at hvanderveen18@hotmail.com . I have a filter on my hotmail account so if you could please put in the subject FSJ doubler or something like that. thanks for the info.

[River Beast]

Why not just do a Klune V Extreme underdrive?

I know the doubler is an awesome setup... but if room is a primary concern.. the Klune V is only around 6-8" long and is around $1500 or so... you can get the 4:1 or the 2.7:1 reduction for the same price... choice is yours and you still have your H-H, H-L, L-H and L-L options

[AM JEEP]

I have never even heard that type of set up.

[River Beast]

wow.... here ya go....
http://www.klunev.com/sidebar2.gif

http://www.klunev.com/yellow_jeep_3.htm

the DAVID unit is 4:1 reduction
the GOLIATH unti is 2.7:1 reduction

[ March 29, 2004, 05:30 PM: Message edited by: River Beast ]

[mountainlander]

You might check with the Klune people, but there is a possiblility you can get it with a Jeep input on one side and the chevy output on the other side, making it a nifty little adaptor. If you decide to go with this setup, here is a good source:

www.mikegreen4x4.com (http://www.mikegreen4x4.com)

[AM JEEP]

Thanks, pretty expensive, but awsome.

[River Beast]

Originally posted by AM JEEP:
Thanks, pretty expensive, but awsome.wait til you price the doubler setup before you say the Klune V expensive... ;)

[AM JEEP]

Yeah I guess you are right with that. I will have to wait until I decide I need a doubler or Klune underdrive kit.

[Marvin-fsj]

The only thing i know is that these type of underdrive units were popular for a while with the cattle haulers where i grew up. They did explode them every once in a while. Not very often but it does happen. I dont think it gets much stronger than the 203/205 combo and you can always find parts for them. Not sure about the klune undrive.

[TexasJ10]

I am pretty sure you can get the 2.7 with a 23 spline input and a 32 spline output. I have been talking to Brian at Outback Jeep about a 29 spline input and 32 spline output to go behind an Dodge NV4500. Apparently there are fewer combinations when you go with the 4:1 setup due to case size limitations. If you talk the folks at Klune they don't really recommend the 4:1 for full size rigs for fear the weight we carry could tear one up. It doesn't sound like they have actually experienced it yet, but I think they are concerned. I think the Klune at only 40 pounds and 6" long is a real competitor at $1700. Especially when you consider that it can act as the adapter as well as the additional reduction unit. You also get 2 wheel low when you have a Klune. As far as parts go, the planetaries inside are stock New Process gearsets. I'm definitely getting one, but I can't decide whether I should go with a 32 or a 29 spline input for use with the 4500.

RB, Did you find one for $1500?

[ March 30, 2004, 07:21 PM: Message edited by: TexasJ10 ]

[Chevelleguy]

In the May 4Weel&Offroad the prototype Axis Underdrive. Similar to a Klune, with NP241, six pinion planetary. 6.5in. shorter than a 230/205 setup and from another source saying retail will be about $1300.

[TexasJ10]

That's interesting since the Klune planetaries are also supposedly from NP241's. Considering the spline counts they offer, it makes since. Maybe all we really need is for someone to make cases to stuff the 241 parts into. Maybe the guys at offroad design should expand their offerings.

[AM JEEP]

Thanks for the info guys, sounds like there is a lot of choices I will have to make and tons of research. If you have anymore info, please post, thanks.

As for the Klune or Axis underdrive kits giving you 2wd low, if you twin stick the NP205 you can get a huge selection, front wd high/neutral/low, and rear wd high/neutral/low, but if you do the mods to the specifications you won't accidentally put the front in either high or low and put the rear in the opposite which would cause a huge pile of parts under your jeep. lol

[River Beast]

Originally posted by TexasJ10:
RB, Did you find one for $1500?Close... $1599 at Mike Greens 4x4

http://www.mikegreen4x4.com/klune_v/index.htm