I bought a wrecked TJ for a 1 ton build. I have a dana 300 that I was about to order the 4-1 and the front and rear 32 spline outputs for from JB (I don't want any other brand). They are telling me they are 3 mo. out and I'm not sure I want to wait. I'm kicking around the idea of a 203/205 doubler but didn't know why you don't see more of them in rigs other than the fact they weigh a ton and are longer making for a shorter drive shaft. Can anyone show me their set up with a doubler. How far back did you have to kick your rear axle to make it happen. I planed on stretching the rear don't get me wrong. Maybe more people are running this and I just haven't payed it the attention. I'd like to get some input from those who have or why others haven't before I run out and do the doubler. Here are a few pics of my build up to this point. I already have the TBI 350, 700r, 60 front chev. and 14b rear, dana 300 with twin sticks etc.....

i hear u on 4.1 jb conv. cant get their shiat together and i was thinking of going the same route 203-205 but ur right, drive shaft can be short.

Started with this
http://i161.photobucket.com/albums/t213/406yj/Blue%20TJ/BlueTJ4.jpg
This was how it happend
http://i161.photobucket.com/albums/t213/406yj/Blue%20TJ/100_2346-2.jpg
This was when I got it home
http://i161.photobucket.com/albums/t213/406yj/Blue%20TJ/cid__0323081516a.jpg
Cut off all the jack up stuff
http://i161.photobucket.com/albums/t213/406yj/DSCN1067-1.jpg

You get the point. I'm about to build the front of the frame after I make another cut a little further back to clean everything up and get it straight. But at that point I will be droping the 350 and 700 in there and wanted to have my T case in there as well when it gets to time to set up suspension etc. But waiting 3 mo. on a 4-1 makes me mad. That's why I'm kicking around the idea of the doubler. I look forward to your thoughts.

There isn't anyone running this in their jeep or know of someone who is?

Please help a brother out:mr-t:

OK.....so I"m not a brother. I'm a country boy. But I'd still like to get some help from someone that knows something about doublers in a Jeep

I'd stick with the D300, even if I had to run it without the JB gears until I could get them.

Everyone I know around here that has a 205 has it in a fullsize truck (e.g., K5).

I'm running one in mine which is under construction right now...the drivetrain is in my sig. I ended up moveing my rear axle back about 14 inches and my front axle out about 9 inches...my final wheelbase will end up being about 114. Keep in mind this is with a long ass th400. With a manual or shorter auto you wouldn't have to move it that much.

I haven't updated the build thread in a while and you'll have to sign up to get a password but here is my buildup off our local club page:

http://forums.cmsja.org/YaBB.pl?num=1181205162

I'm running one in mine which is under construction right now...the drivetrain is in my sig. I ended up moveing my rear axle back about 14 inches and my front axle out about 9 inches...my final wheelbase will end up being about 114. Keep in mind this is with a long ass th400. With a manual or shorter auto you wouldn't have to move it that much.

I haven't updated the build thread in a while and you'll have to sign up to get a password but here is my buildup off our local club page:

http://forums.cmsja.org/YaBB.pl?num=1181205162

I'll have to check it out. Thanks for the link! I don't know why more people don't go this route? I know it has something to do with the rear drive shaft length. With you stretching your rear 14" how log does that make your rear drive shaft? I'm going to be in the same boat as the TH400 as I'm running a 700r. They are not short. I'm building my rig big but I still want to be able to run it to the parts store if need be so I don't want the problems associated with an extremely short drive shaft. I just don't have a clue how long the drive shaft would end up?

I would defiantly go the doubler route they are damn near indestructible as far as pics i will see about getting some pics up sometime lots of options with the doubler try Sumner machine works steel adapter very nice.

Pics would be great but I'd like to hear how long your drive shaft ended up being if you are running something like the 700r,th400, etc. Something that is a long trans with the doubler behind it. Thanks again for the help. I just don't want to drop the coin and then get pissed I bought something I didn't need or would't work.:D

rear shaft is about 29 inches, it sits at about a 25* angle.

I think alot of the reason you don't see more of these combos in jeep chassises is just cause of the weight and the fact that it's probably overkill...you could do a 203/dana 300 combo, probably never break anything and also have better gearing and gearing options.

Keep in mind also that this made my front driveline super long. So long in fact that the only practical way to do it was with a two piece front shaft, which wasn't cheap.

I would probably do it again just cause I love being able to beat on it and not worry about breaking anything...when I get it put together and run it I'll be able to tell you for sure. Any more questions just ask.

I am in the process of putting a 203/205 in my YJ. I am also using a 350/700r4... depending on where your motor sits in the engine bay, your setup will be different. I can tell you that it is a tall setup. After clocking the 205 a couple inches up, the 203 section still sits quite low. To get it up out of harms way, you'll need a decent hole in your floor. I had a 2" body lift on the YJ and still needed a gaping hole.

The 205 output is level with the floor. and FWIW I have enough DS length to keep the angle down using a 106" WB.

http://i71.photobucket.com/albums/i135/sff5758/YJ%20Buggy%20Build/S6300339.jpg

I am in the process of putting a 203/205 in my YJ. I am also using a 350/700r4... depending on where your motor sits in the engine bay, your setup will be different. I can tell you that it is a tall setup. After clocking the 205 a couple inches up, the 203 section still sits quite low. To get it up out of harms way, you'll need a decent hole in your floor. I had a 2" body lift on the YJ and still needed a gaping hole.

The 205 output is level with the floor. and FWIW I have enough DS length to keep the angle down using a 106" WB.

http://i71.photobucket.com/albums/i135/sff5758/YJ%20Buggy%20Build/S6300339.jpg

Thanks for the picture. I'm not sure this is the way I'm going to go now. It looked like a good due to how strong they are but I'm not sure I want to cut into the floor. How long is your rear drive shaft going to end up?

Read Billavista's articles

I love mine! But it is big and heavy, you will have to modify the floor and you will loose some ground clearance. I'll get some measurements and pics later today or tomorrow.

I'm running a 350/700R4/203/205 in my CJ7. I had to cut the floor, I don't think your gonna be able to do it without some floor modification. I'll see if I can get some pics today. I'm at 104 wheelbase and running a CV rear shaft at about 27 inches long.

I'm doing a 203/205 in my biuld. I'm going for a flat tummy and nothing stiking below the frame rails. I ordered my doubler from Jed's and they were happy to custom clock it for me. YOu can lay the 203 on its side or turn it upside down. Mine is upsidedown and ya have to cut the floor. I plan on a tunnel, it eats up inside room but the ground clearance is worth it.

dunno if it'll help much, but i'm running a 203/205 setup in my j-10 with a th400. i went with it cause i don't have to worry about breaking it ever. i clocked mine up 2" from stock and got a flat belly with a lot of floor cutting. i'm gonna put the rear axle for a 109" wheelbase and i should have plenty of driveshaft for the angle. like i said though, not sure if any of this applies to you with a TJ, but if you're interested i can post some pics. overall, super stout, fairly cheap and easy to work on and put together.

Thanks for the picture. I'm not sure this is the way I'm going to go now. It looked like a good due to how strong they are but I'm not sure I want to cut into the floor. How long is your rear drive shaft going to end up?

My shaft will be at a 24 degree angle right now... Since I don't have the 14b pinion or yoke installed, I haven't measured for the shaft yet...

I have a doubler for sale if ya need one. :grinpimp:

I was going to try to run a 203/205 doubler on my diesel YJ, but the whole package turned out to be too long. Even with a 100" wheelbase, there's no way it would fit. Now, I had to move the engine aft to allow room for the radiator and intercooler, but a doubler may have been possible with a smaller motor.

I haven't set my rear pinion angle yet, so the driveshaft geometry looks worse than it really is. The body clears the NP205 just fine with a 1" lift.


http://i256.photobucket.com/albums/hh194/tehintranets/Diesel%20YJ/100_2952.jpg

http://i256.photobucket.com/albums/hh194/tehintranets/Diesel%20YJ/100_2953.jpg

Thanks for the posts!! I ditched the idea of the doubler and bought an Atlas II:D

Thanks for the posts!! I ditched the idea of the doubler and bought an Atlas II:D


Looks like a poor driveway builder does have some sense (me) :)

Looks like a poor driveway builder does have some sense (me) :)

Ya:flipoff2: Between talking with you and the fokes that shared their pics with me I decided it wasn't going to work for my set up since I want to keep my back seat for my 2 girls. All that cuting of the floor looks like a lot of time not that I wouldn't be up for it if that's all I had going on but this build has gotten a little deeper than I orig. thought. So I'm trying to keep it a little more simple and hope that helps the time line out. Thanks for your time Scott!!

Looks like a poor driveway builder does have some sense (me) :)




Tomb Raider, You think you could help a bro out and measure from the front of your v8 (cast iron next to the timing chain cover) to the center bolt in the grille mount under the radiatior? I have the v8 th350/203/205 sitting in my frame with the tub on it and was hoping to keep the engine as far forward as possible (to help with rear drive shaft length). It will really help me make the final decision. Thanks