I have found a 400/203 and have been planning to run a doubler, surfing Pirate I found a 203 to Dana 300 adaptor plate. A freind down the road has a Dana 300 with the 4 to 1 kit in, so has anyone ran a 203/300 with a 4to1 in the 300? Any reason why that would be better that a 205? Should get 6 to 1 reduction right? TIA
CK5
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Tripler Idea
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I haven't done it yet (so who cares, right? 
) but I am doing a 6:1 setup.... A little differently that you mentioned since I've got the 3:1 gearset in a WMS 203 setup, and am bolting it to a conventional 205.
BTW -> Wouldn't a 4:1 gearbox bolted to a 203 actually be an 8:1 box????
) but I am doing a 6:1 setup.... A little differently that you mentioned since I've got the 3:1 gearset in a WMS 203 setup, and am bolting it to a conventional 205.BTW -> Wouldn't a 4:1 gearbox bolted to a 203 actually be an 8:1 box????
So what about a 3to1 203 and a 4to1 300? That would let me keep my 4.10s right?? 
The Dana 300 was never offered in any full size rigs. The only stock apps that I can think of offhand were CJ's and Scouts. I don't know how long it would live in a K5, especially when feeding it doubled torque... 
It would be an interesting experiment, but it could result in lots of broken parts laying under your truck.
It would be an interesting experiment, but it could result in lots of broken parts laying under your truck.
It depends on what you want to put in it for a motor. A Dana 300 isn't the strongest case... put twice the torque to it with a healthy small block in front of it... and have it quadrupling the torque within it... doesn't seem too wise.
Thumper
1/2 ton status
I did some research into this a while ago. The only guys that think a 300 wouldnt be strong enough are the fullsize GM guys. Take a search around... there are tons of Jeep guys running D300s behind VERY strong 454s, 360s etc etc. with TH400s, 465s. You get the idea. They just happen to be in Jeeps so everyone thinks they are weak. Talk to the guys who run em... they sure like them! The only reason I didnt go with one is that by the time you put the 4:1 kit in, buy new i/p and o/ps, and find/ buy the adapter for the tranny, you are passing the cost of a 203/ 205 doubler. At least it was for me here in Canada. Especially since the guys in NWfab in BC started offering a doubler.
Mike
Mike
If you look at the parts between a 205 and a D300... the sheer size is amazingly different. I suspect the D300 would live a happy life with a manual and a NP203 in front of it... but once you try getting 4:1 out of the D300 it seems marginal to me. Especially with bigblock/TPI torque, a 465, and a 203 range box in front of it. That's like 5,000lbs of input torque.
Not to mention more weight. jeeps tend to be lighter, smaller axles, smaller tires (before anyone says anything, how often do you see a jeep on 44's compared to a fullsize?) so theres just alot less weight to move around and that can definelty help the life off the 300
Thumper
1/2 ton status
Yup, like I said, the only guys who think they are weak are fullsize GM guys. There is a Jeep in our club, it has a 468, TH400, D300, D60F, 14FFR 44"TSLs. This thing can blow all 4 tires on basically any surface... he isnt worried about his D300 breaking. There is another guy, has a Scrambler, 360, auto (whatever the Jeep auto is called), D300, D44s on 36" TSLs... wasnt worried in the least about his D300.
I dunno, its prolly a personal thing, and I imagine there are a lot of busted up 300s around, but there are also ways to break a 205 if you try hard enough.
That being said, you HAVE to replace the input and output shafts. Add in the adapter, then if you want the 3:1 kit, you are into it for quite a bit of $$.
Mike
I dunno, its prolly a personal thing, and I imagine there are a lot of busted up 300s around, but there are also ways to break a 205 if you try hard enough.
That being said, you HAVE to replace the input and output shafts. Add in the adapter, then if you want the 3:1 kit, you are into it for quite a bit of $$.
Mike
BurbLover
1/2 ton status
Greg72 said:
Toby (Moneypit) has been running that setup in his truggy w/ 42" Irok's. Works pretty well.
Thumper said:
So what is left then?
So a NP208 is stronger than a Dana 300 according to your reasoning... and has the same gear ratio stock. 32 spine input, 32 spline rear output, and 32 spline front output BONE stock.
k5 krawler 50
1/2 ton status
Wasnt there a company that was making reduction gears for the 205? Does any one have any more info on this? You could then do the 3:1 in the 203, and put lower gears in the 205 giving you a lower crawl ratio the 6:1, right?
k5 krawler 50 said:
JB conversions is making a 3:1 205 but god knows if it'll come out during our lifetimes. By the time you put 3:1's in the 203, 3:1's in the 205, and hook it all up you're looking at a significant chunk of change....like aftermarket t-case chunk of change. And if you did 3:1 in both it'd be 9:1 final.
There was a jeep in Peterson's running a 203/203/205 combo. Using wms adaptors.
Stak monster box.
Stak monster box.
Thumper said:
I have no idea if a 300 would hold up..........but the examples you give do not take into consideration a doubler in front of it. So the 468 puts out, let's say, 500 ft-lbs. of torque. Even a stock TBI 350 would be putting out 600 ft-lbs. when you add in a doubler. Just something to think about.
Maybe this has been discussed/beaten down already, but is there any reason you couldn't just run a Ranger Underdrive (17%) in front of the trans with a doubler?
Didn't do the math, and I see the Ranger is only rated at 420 ft/lbs, so not for a real strong motor, but that reduction going into the trans would be huge. Also need a 465/4500 though looks like.
Dunno, just a thought.
Didn't do the math, and I see the Ranger is only rated at 420 ft/lbs, so not for a real strong motor, but that reduction going into the trans would be huge. Also need a 465/4500 though looks like.
Dunno, just a thought.
