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Wich one?? Low Low range ORD's Doubler or??>>>>>>

Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

I could be wrong but I'm pretty sure that the Atlas cases (even the Atlas III) have a 500 ft.lbs. torque limit. I realize that a motor like that is the exception and not the rule but we all know that big blocks fit these trucks VERY EASILY. I've never seen it in print but I've *heard* that the 205 torque rating is in the 900 ft.lbs. range - read :twice the strength for a fraction of the cost. Also if the Atlas breaks I don't think you can get parts for it, I think you have to send it back to AA for repair (*IF* it broke).

Something else to consider, the Atlas is roughly $2500. For $2500 you could get a 205 (AND convert it to 32 spline), a 203, the Doubler and possibly have money to build the tranny. I'm not knocking the Atlas products but I don't think anybody can successfully argue that the Atlas would be stronger than the Doubler set up.
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

I think all of the strength and torque rating issues are relative. Anything can be broke if you try hard enough. If you could break one, you probably could/would break the other. Back to reality, probably aren't going to break either one.
</font><blockquote><font class="small">In reply to:</font><hr />
:twice the strength for a fraction of the cost.

[/ QUOTE ]
Probably not twice the strength, and definately more than twice the weight.
</font><blockquote><font class="small">In reply to:</font><hr />
Also if the Atlas breaks I don't think you can get parts for it, I think you have to send it back to AA for repair (*IF* it broke).


[/ QUOTE ]
You can get parts for the Atlas t-case. You don't have to send them back for repair, but they do give a good warranty they will stand behind, even after the warranty is out.
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Ok steve..Here is a new twist..
this is from the web..I have emaild them on a set up but have not heard back yet...It is a reversed mounted 203 to a th400 then a mounted to a 205...I have no idea how it works or how close to a doubler it is but thought I would throw it at you to ponder..or is this the doubler...
from the site..
add an NP203 transfer case in front of the NP205 he was planning on using. "But wait! That would give him an even lower gear ratio!" Yes, you're right...but not if you install the transfer case BACKWARDS! In essence, he gave Hulk a very heavy-duty over-drive that halved the overall gear ratio. Of course, you can't just bolt a 203 to a 205, especially if you're going to run the 203 backwards. Fortunately, Ryeguy had a lot of help in the form of OTT Industries. These guys have a long and storied history of devising all manner of Frankenstein drivetrain combinations and they succeeded yet again with Ryeguy's reversed NP203 concept. It required some internal modifications to the NP203 and most of the work centered on reverse mounting it to the TH400. As a precaution, temperature sending units were added to the 203 and 205 just in case they overheated due to an oiling problem.


hulk-6.jpg
hulk-10_.jpg
hulk-5.jpg
hulk-3.jpg
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

That's the opposite of what is usually called a doubler (ala ORD). That thing gives 2:1 overdrive instead of underdrive. Ryeguy comes here sometimes, they make some trick stuff. Wish I had a shop like that...
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Ok, i hear all this about doublers and using 203 and 205 to achieve this for a really low ratio.

Has any thought ever went into and 203 mated to another 203? Or is that just stupid, i'm still new to alot of this technical stuff.
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

The chain part in a 203 is the 'weak link' so the cool thing about 203 to 205 is that it is all gears no chain to worry about! /forums/images/graemlins/thumb.gif
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Is Ryeguy the fella that has Unimog axles under his Blazer? Since those things have a final drive ratio of over 7:1, then he NEEDS an 2:1 over drive to be able to drive on the highway. /forums/images/graemlins/shocked.gif
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Russ,

Wouldn't that make it .50:1? I thought ratios were always in showing the relationship of gearing to a single rotation of the driveshaft? /forums/images/graemlins/smile.gif
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Wouldn't this cause you to run the gears backwards from the way the helix was cut and designed to work? Seems to me you would be powering the coast side of the gears???? /forums/images/graemlins/crazy.gif

Anyone??????? Bueler???? /forums/images/graemlins/ears.gif


Mike
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Aren't the 203 gears straight cut? /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/confused.gif

Rene
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

You know, it has been several months since I built my doubler and rebuilt my 203 range box. I can't remember for sure??????????? /forums/images/graemlins/confused.gif

I don't remember them being straight cut?????? /forums/images/graemlins/blush.gif

Anyone??????? /forums/images/graemlins/ears.gif

Mike
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

That's the guy, and you right, he NEEDs that big OD. I carried on a conversation with him some time back (about custom doublers) and he was very helpful.
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

That's my opinion also, it would be nice to have a normal low-range which would be good most of the time and then be able to shift into double-low for the extreme stuff. I have a couple of friends with 4:1 t-cases, and even a guy with a Sammy with a 5:1 t-case, and most of the time they are running in 4th gear just to try to keep up on the trail
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

&lt;shrug&gt; A ratio is a ratio, the information is there either way. I think the reason OD is usually listed as 0.?:1 is for consistency with the other gears usually listed alongside (like in a 700). If there is a “normalized” standard representation like that, it’s news to me.

I did say "2:1 OD", which provides all the info, but I probably should have at least put it into in:out order as 1:2 /forums/images/graemlins/crazy.gif
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

The 203 gears are not straight cut. They are helical.

As far as driving the range box bassackwards, my guess is that the hardening process (carburizing?) would affect both sides of the tooth equally and so the gears would be just as strong driven either way. You'd be pushing thrust washers the other direction, but that'd prolly be ok /forums/images/graemlins/thumb.gif...

Marv
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Russ,

The "straight" wide lookin' gears in that photo are the sprockets for the chain. The rangebox uses all helical gears, like the shaft at the top left of that photo...

Just took apart a 203 last weekend ..

Marv
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Hehe, I was just about to reply again. Glad I refreshed! Opening several windows and then digging through one by one gets me into trouble sometimes. /forums/images/graemlins/laugh.gif

Anyway, I guess that is a problem with my understanding of the definition of “helical gears”. I thought those were considered “bevel cut” or something like that. Basically straight cut at angle. I thought helical gears were actually curved so that they tooth sort of slid into engagement. I’ve also heard from multiple people that the “straight cut” gears of the 203 and 205 were largely responsible for the noisy cases…

Ok, live and learn, you’re more knowledgeable about those things than me so, I give! /forums/images/graemlins/wink.gif /forums/images/graemlins/laugh.gif
 
Re: Wich one?? Low Low range ORD\'s Doubler or??>>>>>>

Oh, and I did at least know enough to ID those as the chain sprockets. LOL /forums/images/graemlins/laugh.gif
 
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