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3:1 gears for 205!!!

SM420s in a married setup were pretty rare. Jeep guys like them because they're 1.5" shorter and they're willing to pay the price for one. I won't use one because I wanted 32 spline and the proper input for a hydraulic bellhousing.
 
You can already get 3:1 gears for a 203 for a 6:1 doubler from WMS. I don't really see how the 3:1 for a 205 is going to be a great thing. Sure it will put less stress on the 205's input shaft but does it really matter that much? Sure you could do a 9:1 Doubler but lets get in the real world here. Not many people if any need 9:1 gears in the tcases.

A 241/205 doubler is available, its called a Klune V/205 setup. The KluneV offers the same lowrange (2.7) as the 241 does and it is alot shorter and stronger then if you tried to marry the two cases. The 241 doesn't have a range unit like a 203 does so you can't just strip it off and put it on a 205 like you do with a 203 rangebox.

Also, I wouldn't count on the 3:1 for the 205 to be available any time soon. This has supposedly been in the works for a while and is always supposed to come out next year. It is kinda like the ARB for the 14bff. They have been saying it will be out next year for alot of years and they finally have it for sale with a price tag and ready to ship I will believe it. Until some consumer actually lays there hands on a production unit I won't believe what JB Conversions actually says.

Harley
 
I personally would buy one of these to stuff behind a 6.0/4L80E drivetrain. While a 241 would probably hold up under those conditions I would rather get a 205 and not have to worry about it. Plus the ability to do front wheel burns here in so cal on the hammers can help make the trail that much easier.
 
I think the Klune V uses production guts in it or something. The input of the only one I ever saw looked like a 241 input. I highly doubt they have their own planetaries built. If all you want is a reduction box you can cut a 241, 208, BW1345, BW1356 or whatever and end up about as long as a Klune V. If you ever noticed when you had your 208 apart you only need the first 5" or so of the case for the range fork, coupler, and planetaries. Ford guys have been cutting 1356s for a while... in fact my friend Jared did this a few months ago. 123:1 crawl with 3.55 gears in the axles.

From the front of the case to the back of the case on a 241 it isn't much... the tail is twice as long as the rest of the case.

I'd like to keep the front output of the case for cheap PTO in a convenient spot.
 
yeah there is a guy over on pirate working on a 241-planataries-based klune-V killer. Same 2.7:1... same small package... same cable shifting capability, just cheaper. Hopefully he can get them out soon. If I remember correctly, he already has a prototype... think there were pics over on pirate.

j
 
If I'm not mistaken, that's Bboy and he's also a member here (you might remember his uber sweet exo'd K5).
 
nah, my memory of people sucks.. after a bit of time, unless I am good buddies with them, it all just swirls together as "general ck5 knowledge". lol! if I saw a pic of his rig I'd prolly remember it. ;)

j
 
I can see the logic in trying to run a 3:1 in a 205 if you are only going to run 1 case. I would also rather have a 205 with a 3:1 behind a stout motor for the longevity.

If you are looking for dual cases though I think a 3:1 205 is an option but not the best option available unless they can bring it out with a cheaper price then the WMS 203 3:1.

I would rather keep the 2:1 in the 203 box to stress the 205 input less and also becausethe 2:1 2wd single low is an awesome gear for trail use. 3:1 may not work as well as an all around trail gear unless you have some big tires and not terribly deep axle gears.

The doubler guys I run with run in 2wd single low alot. It is easier to steer in open sections of trail and they can also use it to make do hill climbs and some hammer down baja stuff. With my 208 case I don't have that option. I have lowrange or highrange. I can do some hammer down stuff to but it is alot harder on my tranny and my tranny temps rise alot faster then the guys who have the 2:1.

Harley
 
CyberSniper said:
SM420s in a married setup were pretty rare. Jeep guys like them because they're 1.5" shorter and they're willing to pay the price for one. I won't use one because I wanted 32 spline and the proper input for a hydraulic bellhousing.
Click to expand...

All SM420's were "2wd." When used in a 4x4 truck, they always had a divorced t-case, either the Dana 23 or the Rockwell T221.

I don't see whats wrong with doing it up redneck style and running 2 regular transfer cases. Get a stock 465/208 adapter, drivers drop 241 from an IFS truck clocked up w/ SYE. Run a 32 spline NP205 directly off the output with a homemade adapter/bearing retainer. Or just run 2 NP205's in the same manner. Yeah, you need wheelbase, but cheap is cheap.
 
The 3:1 205 has it's place. That place is behind a normal 203 doubler IMO. It won't stress the intermidaite shaft any more that before but gives that middle gear plus that extra crawl. If it hovers around a grand it is well worth it for potential doubler buyers. A used 205 runs around $150, add another $100 for the 32 spline shaft, then $40 for the bearing, another $300 for the rebuild kit, then add in consumables (brake clean, towels, ect) and you are right around $600 for a case and gears that are 25 years old. For another $400 you get a brand new complete all gear cast t-case, with 3:1 in the yoke style you choose, and the round 6 hole pattern. If it was available I would have done it in mine.
 
First off let me state that to worry about an intermediated shaft on a 205 is a huge waste of time. It's just not something to worry about. No offense, but I have rebuilt about 5 of these pigs and it's just not a concern.

Second off, Harley did you say 9:1 gears :laugh: , cause if you did, I'm all about that, sign me up BABY!

For some additional information, you do need more than standard doubler gears, I promise I know. I have the 3:1 kit in mind for the 203 range box this year, there is no such thing as enough gear when in the rocks. The problem will always be how to fit the additional gears in the 205 case without remaking or reworking the factory case, the math just does not work out.

Matt is once again, correct in his assessment of his post above mine, now I know why we let this guy into the Amigos!!!! :grin: :grin: :blush: :D

Harley, I'm all over the 9:1's put my name on the list!!!! :D :D :D ;)

Rob
 
atho said:
All SM420's were "2wd." When used in a 4x4 truck, they always had a divorced t-case, either the Dana 23 or the Rockwell T221.

I don't see whats wrong with doing it up redneck style and running 2 regular transfer cases. Get a stock 465/208 adapter, drivers drop 241 from an IFS truck clocked up w/ SYE. Run a 32 spline NP205 directly off the output with a homemade adapter/bearing retainer. Or just run 2 NP205's in the same manner. Yeah, you need wheelbase, but cheap is cheap.
Click to expand...

Wrong, they had married SM420/T221s for two years (one model year). If the truck hasn't been crushed yet I was thinking about picking it up.

What you said about an IFS 241 is the same damn thing I said... only a SYE still makes it too long and WAY too expensive yet doesn't solve the 241/205 coupling problem.
 
CyberSniper said:
Wrong, they had married SM420/T221s for two years (one model year). If the truck hasn't been crushed yet I was thinking about picking it up.

What you said about an IFS 241 is the same damn thing I said... only a SYE still makes it too long and WAY too expensive yet doesn't solve the 241/205 coupling problem.
Click to expand...

I will try and keep this as short as possible. But you are wrong. 1967 was the last year for the SM420 in trucks. It was divorced in 4x4 apps. In '68 the SM465 was introduced, and it had a married Rockwell T221. This carried over to '69, but '69 was the year the NP205 started to be used as well. All '68 trucks will have a 465 married to a 221, and '69 will be either 221 or 205. My '69 GMC came stock with a 465/221. The 221 sucks and I'm getting rid of it, but that is neither here nor there.

As far as the 241/205 is concerned, the output should just fit right into a NP205's 32 spline input. I know that another NP205's rear output will fit into the input gear, and I assumed the 241 also has a 32 spline rear output. Therefore you'd just need to make an adapter out of a piece of tube and 2 plates. It would have to be machined so it could function as a bearing retainer, however. :confused:
 
SWEET! This is perfect for me personally. Get lower gearing without modifying driveline length or adding the extra weight of the double.

:D :D :D

SM465 + 3:1 NP205 = :pimp:
 
I'm going to have to go junkyarding. I know I've seen what isn't a NP203 or NP205 bolted to the back of what isn't a SM465 in the junkyard in a GMC pickup. If it turns out to be a 465 bolted to the transfer case I'll be surprised because it doesn't have the ribbing my 465 has.


A 241/205 without a custom shaft would add like a foot and a half to your driveline. The output of a 241 is REALLY long but yes it fits into a 32 spline NP205. I've tried it and one of my friends did make a 241/205 doubler... but he has like $2300 tied up in it.
 
Tell us what you have in our survey

Hi folks;
We know we're slow but progress is being made. What I would really like to know is how many of you are running 32, 27, or 10 spline inputs (GM guys only ; for now). If you are interested in getting automatic updates on the progress via. email, please put in your email address with the survey on the web page. www.jbconversions.com.

Thanks
John; JB Conversions, Inc.
 
32 spline here.

I would suggest a new thread with a 3 option poll for the different spline counts (let the board do the sorting for you ;) ).
 
Lomax said:
Hi folks;
We know we're slow but progress is being made. What I would really like to know is how many of you are running 32, 27, or 10 spline inputs (GM guys only ; for now). If you are interested in getting automatic updates on the progress via. email, please put in your email address with the survey on the web page. www.jbconversions.com.
Click to expand...

John,

I know 32 spline is a must 'cause its the beefiest... but for the love of pete, please make a version that is 27 spline. Lots of people have it, and it sucks sometimes when 27-spline-havin' guys are left out cause we're "5 splines short". ;) :)

j
 
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