1-tonmudder
1/2 ton status
Who's runnin one??? I have been tryin to find some info/pics of the DD machine set up,but cant seem to find anything but 231/300 stuff.I searched but about all I could find here was specualtion.
CK5
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241/205 doubler
- Thread starter 1-tonmudder
- Start date
I'd like to know too. 
http://coloradok5.com/forums/showthread.php?t=237360&highlight=241+doubler
here is some 231 stuff
http://coloradok5.com/forums/showthread.php?t=225918
fwiw the 231 planetarys and the 241 are about the same in strength
here is some 231 stuff
http://coloradok5.com/forums/showthread.php?t=225918
fwiw the 231 planetarys and the 241 are about the same in strength
1-tonmudder
1/2 ton status
Yeah but they never came in 32 spline,and by the time I buy a 231 and then a 32 spline input I could probably get a 241 for the same or less.
Most 231 planetaries only use 3 gears and are quite a bit weaker, here's a comparison between the 3 and 6 gears plantaries:
The HD231 (often found in S10's) uses the same 6 gear planetary set as the 241.
As previously mentioned, only the 241's had 32 spline inputs but you could swap a 32 spline input into a 231 case if you wanted to, they are interchangeable.
I plan on building a 241/205 doubler this winter, I have most of the parts already. I had initially planned on a 231/205 doubler but there really is no advantage for me to run the 231 anymore (I'm making my own adapter) and the 241 case is a little thicker with more webbing.
Here's a comparison of the two case halves (241 on the top):
Either way you go, you will have shifter clearance issues with 205. The solution that most people suggest (Duffy included) is to have a machine shop drill two holes in the back of the case and grind your own shift rails out of steel rod. Toss some o-rings around them and then the case shifts from the back.
My plan is to notch the 241 half and weld in half of some ~3" 1/2" wall aluminum tube, basically the same way that NWF solved the problem with their black box (pics here)
I'll do a writeup on it whenever I get around to making the adapter and putting it under the truck.
would it be too much if you were to do a 231 or 241/208 fixed yoke doubler??
Hossbaby50
3/4 ton status
A buddy of mine is a machinist/wheeler and he is going to start work on a 208/205 doubler for his and my upcoming buggy projects. 208's aren't the strongest planetary's but I have beat the crap out of my 208s and I have several extra's laying around to use for the project. We will see how it turns out.
I was looking at the DD machine kits but Duffy basically stopped making them because he would sell 10:1 231 vs 241 kits so he decided to focus on the 231 kits.
Harley
I was looking at the DD machine kits but Duffy basically stopped making them because he would sell 10:1 231 vs 241 kits so he decided to focus on the 231 kits.
Harley
The problem then is it's easy to break the rear case.
If you don't want to deal with shifter issues a D300 clears and is more stout than a 208/241.
Why a 208? I've never had one apart but it seems that the HD231 or 241 setup is better and they're not expensive or hard to come by.
One more thing that I haven't seen mentioned in this thread is you need to use a drivers drop 231/241 with a passenger drop t-case.
Either that, or run the first case upside down which requires a special clocking ring that you'll have to make yourself.
The ideal case for a 241 doubler with a Chevy 205 would be a driver's drop 32 spline Chevy 241.
Either that, or run the first case upside down which requires a special clocking ring that you'll have to make yourself.
The ideal case for a 241 doubler with a Chevy 205 would be a driver's drop 32 spline Chevy 241.
im gonna wait and spend my money on steering,propane and getting my dodge/chevy 208 done (have all the parts sitting here)mabye after the write up ill do something but the klune or black box sure luke simple if you have no nolage or tools for this
That's true but he will sell just the doubler shaft for ~$250 or so IIRC (I bought one from him a while back). The shafts are identical between a 231 and 241 doubler.
The adapter isn't very hard to make from 1/2" aluminum plate and isn't worth the $250 he was asking for it IMO.
Sure the Black Box is easier but its $1600. This is almost an identical box and I'll have $300 into mine.
1-tonmudder
1/2 ton status
I finally got ahold of Duffy and got a little insight on things.So here's what I "think" my options are.
231 with a 241 input
241 DSD
Dodge 241(DSD) with a 32 spline input.I didnt ask Duffy about this but I dont see why it wouldnt work.
He said I would need a round pattern 205,which I dont-mine is figure 8,so he suggested a flippin Ford 205 case with a 32 spline input.I didnt ask but I would think that would take care of the shifter issues.Also,just goin off memory,a upside 205 case would probably tuck up in the frame better as well.
231 with a 241 input
241 DSD
Dodge 241(DSD) with a 32 spline input.I didnt ask Duffy about this but I dont see why it wouldnt work.
He said I would need a round pattern 205,which I dont-mine is figure 8,so he suggested a flippin Ford 205 case with a 32 spline input.I didnt ask but I would think that would take care of the shifter issues.Also,just goin off memory,a upside 205 case would probably tuck up in the frame better as well.
There are round pattern Chevy 205's, flipping a Ford case upside down will require either Duffy to drill and tap his adapter upside down for you or you'll need to make a custom clocking ring.
The round pattern isn't symmetrical, you can't just flip things upside down that easy
If you do go this route, use the 31 spline input from the Ford. It's also practically unbreakable and won't cost you anything extra.
And you will have shifter interference with any 205. You can see that one of the shift rails is nearly inside the bolt pattern, the stock adapters are notched to clear that rail (this is a Chevy 205, the Ford is identical but a mirror image):
You can get a perfectly flat belly with a Chevy 205 clocked up.
1-tonmudder
1/2 ton status
Yeah I have had several in the past but not one right now,and I figured it would be a little more involved than just boltin it up.I have 6-8 bare Ford 205 cases and just thought it would be easier to use one of them than find a round pattern 205.
I assume Duffy had redrillin his adapter in mind when he suggested but he didnt specify.
I assume Duffy had redrillin his adapter in mind when he suggested but he didnt specify.
Hossbaby50
3/4 ton status
We are gonna use 208's but because they are paid for and we have a long supply of 208 parts in AZ due to myself and Marv Springer owning most of the stock in the southwest. My machinist buddy also has the 208 parts he needs and he is the one building it so I am gonna take what I can get. I havn't had a problem with my 208 planetaries in my 6,000lb K5 yet on some heavy use either so I doubt strength will be much of an issue. If I come across a couple 241 planetaries for a good price I might pick them up but if not then it will be 208 guts. Both of us are on real tight budgets for our builds also so using what we already own is another big reason for the 208 parts.
My buddy is planning on building them similar to a Klune with a new aluminum housing so buying the aluminum probably won't be cheap. We may end up using steel just for cost reason of a chunk of steel that size.
Harley
I havn't had a problem with my 208 planetaries in my 6,000lb K5 yet on some heavy use either so I doubt strength will be much of an issue. If I come across a couple 241 planetaries for a good price I might pick them up but if not then it will be 208 guts. Both of us are on real tight budgets for our builds also so using what we already own is another big reason for the 208 parts.My buddy is planning on building them similar to a Klune with a new aluminum housing so buying the aluminum probably won't be cheap. We may end up using steel just for cost reason of a chunk of steel that size.
Harley
If you are making your own cases and have a ton of 208s, you could almost go into production and sell them. 
carpeonnel
1/2 ton status
let us know if you do a write up on a 208/205 cuz I got three 208s at my house and would be very interested
