205 to 205 Double T Case?

[stlaser]

I've read alot about using a NP203 Gear reduction Box and mating it to a NP205 T Case to get an extra low gear ratio. My question is though has anyone heard about an Np205 to an Np205 setup? In the April issue of Four Wheeler magazine there are two readers rides on page 47 that claim to run dual NP205's. Any info on this would be appreciated. I am building a truck and happen to have to NP205's available for a build.

[1969 GMC]

I think it would depend alot on what you're doing with the truck...if you go muddin alot, and general offroading, it would be best to stick with 1 t-case to keep things simple. If you are making a rockcrawler, in my mind that'd be the only real reason to double up on the 205's. Most people are ok with the 1.96 low ratio of the 205, but having low axle gears and a low first gear helps. If you were gonna double, might wanna use 203 or something else instead of the 205, simply because it has a lower low ratio, and thats what you want, right? Or you could even swap t-cases to one with a lower low. Just IMO, of course...and have fun building the truck!

[stlaser]

I realize the use of double t case's and I appreciate your thoughts but I'm really interested in this NP205 to NP205 setup only. I believe their is someway that they get those super low gears for rock crawling by utilizing two NP205's and that was my question. I have seen plenty of setup's using the gear case from a NP203 and the whole T case of a NP205. Thanks in advance for any info you might have.

[Yukon Jack]

I've never seen two NP205's used, would be interested to know why its just the NP205/NP203 combo that we usually see.

[stlaser]

I e-mailed Four Wheeler magazine's editors this morning to see if they could be of any help. No word yet but if I here anything i will be sure to post it

[bouncytruck]

I have seen twin stick 205's before. Are you sure that isn't what they said they had. I have only heard of a doubler made from a 205/203 combo. There are several guys on ColoradoK5.com that have made or run doublers.

[stlaser]

Its possible they didn't say dual case or stick it just stated dual NP205's. Thanks for the insight. I've seen the dual sticks also and the doublers with the NP203 and NP205 mated together

[6869704X4]

Wonder how they addressed the front driveshaft issue, since it has to come from the rear case.
Have you thought about trading one of your 205s to get the 203 reduction. You could probably get some money to boot.

[stlaser]

I already have a 350 turbo mated to a NP203. I part four wheel drives out on the side, so that's not a big deal just trying to see what my options are. As far as the front drive shaft maybe they rotated the front case up or down so the rear tc's front drive shaft would clear, don't know just guessing. I guess that's the reason for this post

[BLAZIN'72]

The overall length of the Doubler™ is now 21.5" for all versions. This is measured from the front face of the 203 to the rear yoke centerline on the 205. This is the same length as the original 203, and only 6" longer than original GM 205 applications. It's 9" longer than a 205 for the Ford guys. The new compact length allows the Gen2 Doubler™ to fit in many more applications while still leaving adequate rear driveshaft length. Keep in mind these measurements are not absolute, they can vary as much as 1/2" either way depending on the case length variations and yoke length. This does not include the adapter between the transmission and NP203.
This is off of www.offroaddesign.com. They don't actually say why they use the 203/205 setup instead of 205/205 the info seems clear, why? Why would you want to use 205/205? First off the weight of one 205 is a back breaker, but two! Secondly the length, as they say with their adapter the 203/205 combo is the same overall length as the 203, what could be better than that? Lastly the parts and the info are already there, the work has been done, not to mention that you would still end up with a higher overall ratio with 205/205. I personally don't see any advantages to the 205/205 combo, if i am missing something feel free to point it out

[stlaser]

Exactly! my question is how are they doing it (205 to 205) and why? I am looking for info on this setup the 205 to 205. I already have info on the 203 to 205 setup. Thanks for all your info on the 203 to 205 doubler. But that is not the original question. That is what you missed.

[BLAZIN'72]

I know what you are saying , and i know that i really didn't answer your ? but i was just asking you why. Now i don't know this for sure but i'd bet if you call off road design and asked they would most likely tell you they tried alot of different combos as I am sure over the years many other gearheads have including myself, and it seems to me the 203/205 combo appears to be the best suitted to most applications. However if you do the 205/205 combo I would be very interested in hearing about it.

[6869704X4]

You could run a killer PTO off the front cases front output shaft. Which will probably be in the cab with you once you clocked it up high enough to clear the rear cases front driveshaft. hehe

[stlaser]

Hey then you could sit on it and see which moves faster the PTO up your rear or your mouth! Its all in good fun til somebody's eye gets poked out. hehe

[1969 GMC]

I believe their is someway that they get those super low gears for rock crawling by utilizing two NP205's and that was my question.

The reason they have a 203/205 doubler is that 205's are a popular t-case, but 203's are able to be taken apart. In the doubler designs, they don't use the whole 203 t-case, just the low range part (for want of a better word). I don't think 205's can be taken apart like that.

You also would get a slightly lower low range with a 203/205 (3.92) than the theoretical dual 205's (3.84).

[TX_Mudder]

The 203/205 is usable because it is not very long. If the tcase combo gets too long the rear driveshaft will be very short. IF you plan on a 205/205 then also plan on a long wheelbase vehicle.

Having said that, then yes you could do this. What you need is a 205 that mates to your current tranny, stock. Then you need a divorced 205. Bingo, dual 205s. You're on you own about where to put the extra shifter.

-- Mike