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  #1  
Old 11-23-2006, 01:43 PM
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4x4fEvEr 4x4fEvEr is offline
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203/205 doubler ingredients

im gettin ready to buy all the pieces for my doubler and well i dont know what im lookin at

im gonna be runnin an NP435 so i want a 31 spline 203 right? and a married np205 right? both ford products? im only gonna use the front half of the 203 which is called the range box???? and this all goes together with a kit from (insert name of best kit here)
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Old 11-23-2006, 09:16 PM
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get a 435(or t18) with a 205 attached. id avoid a t18 with a 208 if you want to go the doubler route,as the 208 will have a different stickout length for its input gear,and therefore possibly either a shorter tailsahft on the tranny,or a longer adapter.

i have been told that the ford 203 will have the same stickout for the input as the 205,and the same round NP pattern. im also told it doesnt matter if it comes from an auto or a manual,it will bolt on where the 205 was. this is just what ive been told,ive never laid my own eyes on a ford 203,so i cant really say for sure.

other than that,you have it figured out. youll disassemble and discard the chain section of the 203,and whomever you buy a kit from will either cut down and spline your shaft,or send you a shaft,and take yours as a core. as such,the range box will need disassembled to swap in an appropriately splined output shaft to slide into your ford 205.

the doubler adapter bolts onto the rangebox in place of the chain section,2nd t case bolts to the adapter. rig up the shifters, make some driveshafts and hit the trails

as for whose kit to use,i cant remember whose the guys were the most impressed with. imsure desertbeast or blt2krl will chime in on that one.
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  #3  
Old 11-24-2006, 06:49 AM
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Bama Burden Bama Burden is offline
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Northwest Fab was recommended to me because of the clocking ring. Although, I've heard there are shipping problems due to NWF being located in Cananda --- it takes a while to receive it
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Old 11-24-2006, 07:40 AM
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Quote:
Originally Posted by 4x4fEvEr
im gettin ready to buy all the pieces for my doubler and well i dont know what im lookin at

im gonna be runnin an NP435 so i want a 31 spline 203 right? and a married np205 right? both ford products? im only gonna use the front half of the 203 which is called the range box???? and this all goes together with a kit from (insert name of best kit here)

You will want what ever 203 bolts to your transmission. Not positive the options on this cause I bought a TH400/203 combo. You will need a Married 205 unless your going to go the route like Crazy jeep. I think your setup would be best off with a married setup for better length. I.E shorter setup. You are correct only the gear box of the 203 is used. As far as using only ford products that depends on what fron axle you have. You can use a ford or chevy 203 and then either a ford 205 or chevy 205. The adapter that goes from the 203 to 205 can be setup for either ford or chevy 205. I know I pimp the NWF guys and the reason is noone elses kit on the market is as easy and installer friendly. Not to mention the clockability gives you more options than the rest. I was one of the first to buy their kit. I slapped the whole thing together only to find out the guy who rebuilt my tranny screwed up one of the clutch packs. I tore the whole thing apart agian. I called and talked to kyle, he sent me an entire gasket over night at no charge. Granted it was not an exspenvie deal to begin with but it won me over as a return customer. I have never had a problem with shipping and these guys have always bent over backwards for me. Who ever you decide to go with the doulber setup will put a smile on your face the first time your in double low.
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  #5  
Old 11-24-2006, 09:18 AM
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Quote:
Originally Posted by 4x4fEvEr
im gettin ready to buy all the pieces for my doubler and well i dont know what im lookin at

im gonna be runnin an NP435 so i want a 31 spline 203 right? and a married np205 right? both ford products? im only gonna use the front half of the 203 which is called the range box???? and this all goes together with a kit from (insert name of best kit here)

Ford 203's are hard to come by, you just missed one on e-bay btw...
You don't actually have to use the Ford 203, if you can get the gear (NW Fab... or scrounging) you can redrill the front of an easy to find (and often cheap to free) GM 203. I have a drill template I can loan you when I get it back from another member

Your Ford NP435 will adapt to your AMC with a new input bushing for your flywheel, a ford clutch plate and a T176 bell (for the easiest adaptation). I bought a NW Fab adapter with the Ford 31 spline 203 gear as my GM 205 had the long 32 spline input that needed swapping out for a short input and the Ford 31 spline is real common and easy to scrounge up.
My range box is done and I just stuffed the gear in the gear in the 205 yesterday.
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  #6  
Old 11-24-2006, 09:23 AM
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Here's a Ford unit with 5 hrs to go on E-bay right now:

http://cgi.ebay.com/ebaymotors/New-Process-NP-203-Transfer-Case-Ford-Chevrolet-Dodge_W0QQcmdZViewItemQQcategoryZ33733QQihZ002QQit emZ120054487882QQrdZ1QQsspagenameZWDVW
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  #7  
Old 11-25-2006, 12:29 AM
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I'm probably not lucky enough for some one to have come out with a kit that uses the 208 for a range box yet am I? Looking at some options for the J20 but I was planning on keeping my T18(a??) nice low first gear, I like it
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  #8  
Old 11-25-2006, 04:15 AM
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Quote:
Originally Posted by mud_slinga
I'm probably not lucky enough for some one to have come out with a kit that uses the 208 for a range box yet am I? Looking at some options for the J20 but I was planning on keeping my T18(a??) nice low first gear, I like it

The NP435 is lower yet...and a bit more versitile box. PTOs on both sides if I recall.


aa
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  #9  
Old 11-25-2006, 07:27 AM
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Cecil is right, the Ford NP435 is 6.68:1. If you have the '80+ T18 that fits the NP208 then you have a 31 spline output and round pattern that should bolt directly to a Ford 203 range box. You should be ready to rock mud_slinga!
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  #10  
Old 11-25-2006, 05:00 PM
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4x4fEvEr 4x4fEvEr is offline
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Quote:
Originally Posted by blt2krl
You will want what ever 203 bolts to your transmission.
im guessin for mine i need the ford 31 spline 203 which i have a lead on.

Quote:
Originally Posted by blt2krl
As far as using only ford products that depends on what fron axle you have.

well thats a toss up. i could go either way. i was planning on running a ford front axle, but the 205 for drivers drop is really going to have me cutting out some body material from underneath to squeeze it in plus rerouting my exhaust which i just had done, but i will have a highpinion 60 that way.

if i go with a chevy 205 ill have no issues except ill still be running a low pinion front axle. just a matter of if the HP will make the difference for the extra work.

Quote:
Originally Posted by blt2krl
You can use a ford or chevy 203 and then either a ford 205 or chevy 205. The adapter that goes from the 203 to 205 can be setup for either ford or chevy 205.

thats good news right there.



High pinion 60 with more labor and cost or low pinion 60 that will go in very very easily?
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Old 11-25-2006, 07:06 PM
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Quote:
Originally Posted by Elliott
Cecil is right, the Ford NP435 is 6.68:1. If you have the '80+ T18 that fits the NP208 then you have a 31 spline output and round pattern that should bolt directly to a Ford 203 range box. You should be ready to rock mud_slinga!


Thats what I like to hear thanks for the info, I did not compare the 2 trannies but I knew the 435 Had a super low gear as well but the T-18 is already in the truck 203-205 and 5.38s in the axles (I like low gears lol) although if I can get my hands on some rockwells Id rather run those instead of 60's on the J-truck... okay im done hi-jackin his thread
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  #12  
Old 11-25-2006, 07:38 PM
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Not sure if this is a good deal or not.

http://bb.tennesseeoffroad.com/ubb/u...c;f=8;t=011975
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  #13  
Old 11-25-2006, 07:48 PM
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i dunno . anybody else know if thats reasonable?
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Old 11-25-2006, 07:55 PM
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Depends on the set up and if it's triple sticked or not. Some early doublers were ground down 203 tailshafts w/hollow core and the better ones are billet. For all I can tell, this one may be a Toyota doubler 'cause he gives just about no info....
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  #15  
Old 11-25-2006, 08:04 PM
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my vote is for NWF.......very nice kit, easy install, lots of adjustment......plus, they made it easy to use my ford 205 without changing inputs...
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  #16  
Old 11-25-2006, 09:02 PM
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somebody ask about that kit. i just tried to register a username and everytime they email me my password i cant see it!?
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Old 11-25-2006, 09:07 PM
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ok little confused on my NP435. ive been reading there is a difference in shaft length between a 435 that was bolted up to a 205 or a 208, if true what do i need to do since my NP435 came from in front of a 208. i have the spacer or sleeve or whatever you call it from in between the tranny and t-case from the 208 setup. is that the one to use for the 203 or do i need to use the one from a 205 setup or what?

another question. the np435 will sit closer into the dash since it doesnt require the spacer that went in front of my t-18?
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Old 11-26-2006, 07:59 AM
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Quote:
Originally Posted by 4x4fEvEr
ok little confused on my NP435. ive been reading there is a difference in shaft length between a 435 that was bolted up to a 205 or a 208, if true what do i need to do since my NP435 came from in front of a 208. i have the spacer or sleeve or whatever you call it from in between the tranny and t-case from the 208 setup. is that the one to use for the 203 or do i need to use the one from a 205 setup or what?

another question. the np435 will sit closer into the dash since it doesnt require the spacer that went in front of my t-18?

I'm not sure where you found the output shafts are different lengths, not to my knowledge (NTMK?) On the SM465, which I can confirm, it used different length adaptors to the case and would suspect if there is a difference with the Ford that it is also in the adaptor length. I think it probably has to do with the variances between the 208/205 inputs and how the tranny tailshaft needs to engage. The 208 input is probably located further foward in the transfer case requiring a shorter adaptor.

What is the measurement of your 208 adaptor to compare with?

The NP435 205 adaptor is 8 5/8" leaving 3/4 of 435 tailshaft stickout (edit, both of mine are the same). I'm not sure if the 208 adaptor is any different... if so I'd bet you want the 205 adaptor as the 203 is more similar to the 205 at the front of the case then the 208.
It will put the tranny closer to the firewall, but the shifter is already bent different to clear a Ford dash. Can't tell you if it's knuckle basher yet, but you can always heat and bend it back a lil if you need to.

Edit, Both the Ford and GM pattern cases locate the input gear in the same location respective to the back of NP435 adaptor I have. The NP435 tailshaft has 2.5"s of spline length and sticks out ~7/8" past the end of the 8 5/8" adaptor. The 31 spline input sticks out of the case 1 1/4" and has internal spline length of 3". The total spline engagement with this set up is ~2 1/8" with the gasket in there.
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Last edited by Elliott : 11-26-2006 at 11:28 AM.
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Old 11-26-2006, 11:05 AM
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4x4fEvEr 4x4fEvEr is offline
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thats good info elliot thanks. going to pick up my 203 today!
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Old 11-26-2006, 11:23 AM
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LMK what you measure for you NP435 tailshaft and adaptor.
My tailshaft is ~9 1/2" overall.
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