You guys have washed my brain with the idea of going slow , so after I've finished my chassis and frame , I decided to install a 203 and a 205 into my drivetrain .
The problem is that the rear driveshaft is 36 cm!:confused:

Therefore I have 3 options ahead (I can't afford 1800$ for Klune nor 2200$ for Atlas ).
1- take the rear axle backward .
2- take the engine forward .
3- throw the 203 and build reduction box with a
Planetary unit and a lot of machining ( I can engineer and do
the Job correctly) .

The best option is the last one ( 17 cm instead of 30 cm = rear drive shaft 49-50 cm ) BUT the biggest problem is the planetary unit - I think that a unit from a NP231 nor NP241 will last with V8 and 40" tires .

Where can I get/purchase/steal/take/create a stronger planetary unit ?

Thanks in advance

the 203 has a planetary gearset in it.

All I can add is that I would trust the 241's planetary before the 231's. That still isn't saying that I would trust the 241's planetary for your particular application. Moving the axles/powertrain around may be an easier/faster solution.

cmk

the 203 has a planetary gearset in it. - sorry but you are wrong - it has 4 big gears .

Moving the axles/powertrain around may be an easier/faster solution - you are right , but it gonna cost me in changing the center of gravity - i prefer to leave the engine more closer to the center of the vehicle .

what is your wheelbase at now (in inches please :D ) ?


- jack

107 inch

I think that a unit from a NP231 nor NP241 will last with V8 and 40" tires . - sorry , i wanted to say that i don't think it will last .

That still isn't saying that I would trust the 241's planetary for your particular application. why? the 241 reduction is before another case or anything. no more stress than in a stock application with big tires. ;)

Originally posted by FULLSIZE
why? the 241 reduction is before another case or anything. no more stress than in a stock application with big tires. ;)

Excellent point.

cm "realize that, not I did" k

I'd go with the 241 set anyways. You no longer have a "doubler", but now you have 3 low range options instead of just 2, think about it. Also moving the rear axle back is always good even if you don't need it for drievshaft length, it will climb better, and departure angle will be improved.

I don't understand why you don't have enough room, I have the generation 1 doubler at 110" wheelbase.

Do you mean that you wanted to mount a complete 203 and a complete 205 (ie one married, one divorced)? Or are you talking about a doubler setup (such as that offered by ORD, or Wagoneer Machine) that only uses the gear reduction box from the 203?

If you're looking at 241s, be aware that there are at least 2 versions (strength wise), in the late model Dodges, most had the 241 LD, the 241 HD was optional (and no, it was not standard on diesels). It could be ordered by itself, or as part of the plow package. However, I don't know if there is any difference in the planetaries by themselves. I would think either unit would be up to the task, though.

Pete

first , thanks for the replys .

redwilly - what is your rear drive shaft length ? and what kind of engine transmission ? and axles ? mine is Dana 70 - so the yoke sticks forward 16" from the tube .

pcorssmit - i want to mount a 203's reduction box with a married 205 ( with a female shaft ) and the total length is - 21"- 22" .
the adaptor between the transmission and the reduction box is 2.7 " ( 7 cm ) , i haven't machined the second adaptor , but i think his length gonna br around 3"- 4" .

* who is the strongest transfer case between 231's , 241's , Dana 300 , Borg warner 1351 ( i think , it was one GMC 4x4 Pathfinder Van ) , 208's , ?
all of them expect the 300 , have planetary unit .


Thanks

I don't know what's in the water up there, but these BC guys are always coming up with stuff like this. If you do go the planatary route, this might help.

http://www.bc4x4.com/tech/bryce/tcase/tcase.cfm

as for strength,

http://www.newventuregear.com/tcases.html

that site lists all NV transfercases, should give you what you want. I'd shoot for that 271, and make sure you get the electric shift :)

and take a lot of pics if you do it, I'd like to try this myself (231 planatary to a dana 300)

chad

o.k., I did some research this weekend and that what I have found.
* I can get a rear drive shaft as long as 55 – 60 cm
( 19.6"- 23.6" ) is it good enough ?
* This length will cost me of taking the rear axle backward and
the engine forward.
* I can machine , the adaptor between the 203's and the 205's
as long as 2" ,
sound reasonable ?
* I've read in the Klone's Catalog, that a YJ with a Klune has 13"
long rear driveshaft
isn't it a bit short ?? Cause if it's not, I don't have to do all this
mess!

What is your Rockbuggy's rear drive shaft length?
Can I be relaxed with a 20" long drive shaft? It's gone be driven only on extreme?
How much did you change the rear axle's angle ( caster ) ?

Thanks