NP203 to Dana300 doubler?

[wickedwagon767]

Saw this add on CK5 Vendor forum and its the first I've seen/heard of it

anyone know anything about this doubler setup?

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:eek:

[pwrwgn]

My Father has one in his M37. Behind a 383 stroker. His has held up well. But he dosnet beat on it that hard. If you gonna wheel it hard I would suggest beefing up the 300.

[wickedwagon767]

I already plan to upgrade front/rear outputs to 32-spline on the Dana300 I have. That takes care of any strength concerns with the Dana300 and in that form they can handle tons of torque under hard use.

My question was, has anyone heard of or actually used this doubler combination. I have never heard of a doubler kit to mount an NP203 rangebox to a Dana300. I've emailed the maufacrurer with no response yet.

I want to know more about it

[tem375]

Couldnt you put 4:1 gears in the dana 300. I thought there was a kit for that that would be way cheaper. Seems to me that would be more effecient. I might be wrong, but wouldnt it be stronger to do a 205 behind it. Unless you are going to put the 4:1 in the 300 and have a SUPER low doubler.

[wickedwagon767]

Teraflex and I believe JB conversions offer 4:1 gear sets for the Dana300, and I have considered that as a future upgrade.

I just came across this doubler add and am just looking to find out more about it. The potential of a 203 rangebox up with the 2.62:1 D300 factory low range is beyond 4:1 I'm sure when compared to the drop-in gear sets for the D300. I believe the 203/205 doublers have a max 6:1 low range and the 205's factory low range in itself is a meager 1.96:1. So you can imagine where I'm going with that.

Though fairly stout in its own right as a Dana300 may be, I've been told by Stuka that even after 32-spline front and rear upgrades the factory gears and case become suspect when used under severe torque load. And apparently the doubler combo has been available for the Dana300 but people generally dismiss the 300 for the 205 for its sheer beef and lack of worry about the 300 holding up.

So, looks like it will work. Question is, do i need it? Probably not

At least not at the moment;) . I have not been offroad in over 3 years since I let my '97 Ram go and I've had my Wagoneer since late August of '05 but am just now really starting to dig into it. Other things have kept it at bay.

I had set my mind to build this Jeep once, and do nothing twice though it looks like that ideal is deeper than my wallet, for now. Or, rightly said, I'd say it would take far to long and keep me out of the dirt longer than I want in order to build it no-holds barred. Be that as it may, I think the first phase of this buildup will be kept a little more simple with functionality,capability and reliability in mind. I'm not going to wait for a year + before I can get out and have some fun.

so for starters, the D300 will be going in with the stock 2.62:1 low range and a 32-spline front and rear output upgrade.

That will prove to be a very capable combo when coupled with a fairly healthy 360, built TH400 with 3:1 first gear,high-steer and probably 4.10:1 geared 3/4 ton GM axles rolling on 36" tires.

Rest assured things will get crazy when the time comes:cool:

[Sambo]

wow dawg!:eek: now i am trying to decide whether to buy it now!:mad:

[grimgaunt]

the 'stazworks' doubler is better, less expensive and a bit more heavy duty (see the specs).

Search on Pirate for the details.

The 4:1 Dana 300 option is fine for our rigs unless seriously built (engine-wise)

Only after you have a 401 built to the hilt (if then) do you need to consider the doubler.

I was looking into it because I tried a Mercedes diesel and wanted a divorced t-case option and the divorced 203 + Dana300 sounded good.

[wickedwagon767]

Sambo, with your feather light right foot I'm sure you could run the 203/300 doubler combo without any strength concerns.

Depending on whos scale you're tipping, I think the Dana300 in stock form can handle some pretty hard wheelin'. And with the 32-spline upgrades its not to far behind the 205 in strength which is the undisputable king of transfer case beef, no doubt about it.

As for biggest bang for the buck? Its almost a tossup cost-wise but the 300 is a little more expensive to build. D300's are harder to find since they were only used in 80-86 cj's and '80 IH Scouts. They usually run between $225-$350 a pop. I've seen them go as high as $400 in stock form and in good shape. I got mine for $250.The 32-spline upgrades are what send the cost up, along with the pricey adapter needed to mount itsince they weren't available behind a variety of trannys like the 205. The Dana300's will actually bolt to the NP208/241 adapters,which can be had cheaper.....but I've also heard an extra hole has to be drilled into the 300's case to mount properly! The 205's are plentiful in the TH350 and SM465 version.....but not in the TH400 versions which are more expensive because they already have the stout 32-spline input needed for the doubler configuaration. The TH400 versions usually run between $400-500 stock and in good shape! The 465 and TH350 version are around for between $150-200 but need the 32-spline input upgrade in order to mount a doubler setup which is about $200. I have a 465 version 205 lined up locally out of an early 80's 1-ton chevy for $150.

I suppose the ultimate setups for both would be a 4:1 geard Dana300 with 32-splined input/outputs mounted to the 203 rangebox

and then the new JBconversions LoMax 3:1 205 mounted to the 203 rangbox!

anyway, its 4:45 am and I'm just rambling....:rolleyes:

[blt2krl]

If it were me, I would look at the Company North West Fabricators at www.northwestfab.com (http://www.northwestfab.com). The make a clockable and great adaptable setup. the bueaty of their setup isthe adapters all bolt together. Not full machined or welded like other doubler setups. You can run your dana 300 and then up grade later if needed and all you would need to purchase is a new input gear and adapter plate for the new case. This would be cheaper then having to purchase the whole deal all over agian. I don't know what your rig looks like, I.E. full bodied or chopped. If it were me I would not be looking at the 300, you can upgrade the guts and the out put but I will be ****ed if you can up grade the case. A buddie of mine grenaded a 300 that was upgraded just short of being an Atlas. He was running it in a CJ on 37's that has been heavily modified and wheeled hardcore. I personal would save my time and money on mods that will provided long term dividens and not short term results. Build it the right the first time.

[Sambo]

well for starters there are no t400 with 32 splines to be had within a 300mile radius here:( as for the 205's its about 500 miles,and on top of that they want 300-500 for the SOB!:eek:
i picked up a long shaft D300 from heimekin for somewhere around 250 i think!
got the t400 kit from novak and it runs fine! even when i have to do the "gas it thing"...
unless someone has stuff they want to SWAP forget spending much more money on crap thats over priced anymore!
i already have the dodge 203 which has 23 splines and is the same as my d300...
so anyone got an extra 205 they want to "give me"?...

[wickedwagon767]

I could be mistaken,but don't you need a 32-spline 203 for the doulber with the NP 205 Sambo?

$300-500 is about what they're going to cost Samby. Think about it, wether you upgrade the outputs and innards in your Dana300 or find you a 10-spline 205 for about $150 and then upgrade it to 32-spline for a couple hundred bucks more in parts.......you're going to spend that much anyway.

If you can find a 32-spline 205 I'd snatch it up for no more than $400. Like blt2krl said.......long-term dividendes are worth the initial cash shell-out.

If you really want to run a 205 doubler, put your D300 up for sale along with the Novak parts. With a $430 Novak T400-D300 kit and 300 in good shape I'm sure you'd have a 32-spline 205 and much of the doubler parts payed for with the sale

[wickedwagon767]

blt2krl

You're right about NorthwestFab. I've seen their site and I like the idea of not having to replace the whole setup to upgrade.

[wickedwagon767]

Offroad Design.....love these guys!

http://www.offroaddesign.com/NP205tech.htm

http://www.offroaddesign.com/transfercaseparts.htm

just about all the info you need concerning NP205 cases