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Old 02-23-2010, 05:53 AM
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Question doubler

Has anyone heard of the "Doubler" from Offroad Design? NP203 transfer case gear box (front half) mounted to a NP205 transer case rear half. total of 3 sticks to operate the resulting transfer case. 1 stick is for 4wd-2wd on the NP205, 1 stick is for Hi-Lo on the NP205, and the other stick is for Hi-Lo on the NP203, resulting in 3 gear ratios instead of 2...stock 1:1 (Hi), stock 2:1 (Lo), and a 4:1 ratio when both sticks are in Lo. If anyone has any experience with this "exact" set up please let me know. I wanna know a little more about how well it works before i spend the money and time building my transfer case like this. Thanks
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Old 02-23-2010, 07:27 AM
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Well..... I have no hands on with this kit but this is basically what a lot of people run that like to do rock crawling. it is nice because you can keep a 4.10 - 4.56 ration in your axles while still able to get a 90:1 (if not more) final crawl ratio. The 203/204 case are very strong and handle a lot of abuse. You could install this in your daily driver but you need to remember that you will be shorting your rear driveshaft and lengthing your front.

Are you building a purpose built rig or daily driver that you want to be able to do everything with?
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Old 02-23-2010, 08:07 AM
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well right now its a daily driver that i can do everything with but within the next 18-24 months I wanna buy a Dodge cummins diesel 4x4. Than that will be my daily driver and the '79 will no longer be street legal...I havent decided if i wanna go the rock crawler/mud-boggin' route or the sled pullin' route...but i have time to decide gotta buy a cummins first and that will be a little while.
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Old 02-23-2010, 06:38 PM
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The best thing to do is to sit down and really think about what you want. You may be able to do both though.
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Old 02-23-2010, 07:24 PM
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another reason im considering this doubler is because than i will have a true part-time 4wd truck (only 4wd when i put it in 4wd) whereas the Warlocks came with this new design in their day that is all time 4wd (80% rear 20% front) and 4wd Loc (50% rear 50% front)...i dont really like this design at all and i also hear that it is not a very strong design
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Old 02-24-2010, 03:36 AM
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I'm know nothing about that design. I had a QT t-case in my 74 J10 and they were strong but only if you took care of them. I'm sure that these cases are the same way.

The 203/205 doubler just can't be beaten though. Thing is, if your just looking for a strong case, then I would just replace what you have with a 205 with a Lomax low range kit installed and completely rebuilt. It will probably be more than enough for what you are going to be doing. What size tires are you going to be going with once it is all said and done? Are you going to keep it on 35s only?
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Old 02-24-2010, 04:24 AM
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no probably 38's or 40's at the most
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Old 02-24-2010, 05:57 AM
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Don't bother doing a doubler, it's not worth it for tires that size on a full size truck. Find a D300 t-case (iron case and gear driven - very strong), get a 4:1 low range kit, 32 spline HD outputs front and rear with 1350 yokes and twin sticks. The D300 cases can have inputs changed out very easily so that they can bolt up to a 727.

Get a set of D60 axles (either already built or build them yourself), gear them to 5.13, throw a full spool in the rear and a Detroit locker in the front, and 1350 yokes.

This setup will give you a good final crawl ratio for when you hit the rocks, will allow the motor to get the power to the wheels for pulls and mudding, and the spool and Detroit will give you the reliable traction that you will need for anything you decide to drive over/through.
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Old 02-24-2010, 07:37 AM
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haha...you've played around with these trucks before havent you? now the ARB's is the only thing i can use to give the results im wanting AND still drive on the highway correct? or can detroit's go on highway too? i wouldnt mind it being posi all the time in the rear especially if i decide to show off at a traffic light
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Old 02-24-2010, 09:56 AM
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I've played around with a lot of 4x4 vehicles.

If you can (meaning state law allows you to) drive it on the road, then yes, go with ARB lockers.

A spool spins both tires til you break an axle shaft. The nice thing about a spool is that there is no unloading/loading happening inside of it. That is the point at which you would start to break things. You only want to have them in the rear as the tires will always spin at the same rate so when you are turning your back tires will chirp a little. You do not want one in teh front axle as it would make it damn near imposible to steer.

You can drive on the road with a Detroit locker, you will jsut want to make sure that your manual locking hubs are unlocked.
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Old 02-24-2010, 04:02 PM
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detroits it is...arkansas doesnt care i could drive big foot down the road as long as i dont get in a wreck...im in virginia for the next 3 years and for the most part they cant do **** as long as i stay licensed in arkansas and the truck still fits in 1 lane
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Old 02-24-2010, 07:08 PM
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If you want, I'll come up with a list of parts that you will need, why you will want them, and where you can get them..... it'll just take a little while with what I've got going on.
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