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Old 05-09-2010, 06:32 PM   #1 (permalink)
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np 203 to 205

hey. right now i have a NP203 tcase in my truck that is not working correctly. i figure this is the chance to get the tcase that i want, which is a NP205.

what all, if anything, will i have to change under there?
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Old 05-09-2010, 06:41 PM   #2 (permalink)
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Need more info like what tranny. But probly will have to swap output shafts, ones for a 203 are real short, whereas 205s are longer.
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Old 05-09-2010, 08:14 PM   #3 (permalink)
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ok my bad.
351m motor
C6 tranny

and i found a person on craigslist that has an NP205, but its mated to an AOD tranny and they want to sell as a set. worth it?
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Old 05-10-2010, 09:07 PM   #4 (permalink)
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aod to 205.
for some reason i doubt that ever happened from ford
what 4x4 got an AOD? ranger maybe??
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Old 05-11-2010, 10:02 PM   #5 (permalink)
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he emailed back. it's not a 205. still looking.

but is the shaft from tranny to tcase different from 203 to 205? (input shaft/ output shaft. dont know proper name for it)

are cross members different?
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Old 05-11-2010, 11:55 PM   #6 (permalink)
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yours is 31 spline
ford pretty much used the same spline and boltpattern in the fullsize trucks til I dunno when
a 205 should bolt up once you get the matching driveshafts
the 203 is kinda rare and valuable for someone doing a doubler setup in the ford
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Old 05-12-2010, 12:17 AM   #7 (permalink)
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would a truck with a 203/205 doubler set up be streetable? or would it be geared too low?

my truck is not only a toy, i use it to tow the boat to the lake, tow mowers, and just drive in general. so would a 203/205 doubler set up be ideal for what i use it for, or primarily just for trail riding/ dedicated off road vehicle?
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Old 05-12-2010, 12:57 AM   #8 (permalink)
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It would be the same on the the street.

You'd just have the option of 1:1, 2:1, & 4:1
(technically it's 1.96:1, 2:1, & 3.82).

You'd just need to fab up a new crossmember mount & new driveshafts.
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Old 05-12-2010, 11:51 AM   #9 (permalink)
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i see.. i'll probably keep my 203 around then. ill get the 205, put it in until i rebuild my 203, and buy a doubler/ driveshafts.
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Old 05-12-2010, 02:54 PM   #10 (permalink)
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i see.. i'll probably keep my 203 around then. ill get the 205, put it in until i rebuild my 203, and buy a doubler/ driveshafts.
Why rebuild the 203? You just need the front half of the case, the rest is junk anyway. If you swap the 205, you'll need new driveshaft(s), and then if you do the 202-205 doubler, you'll need new driveshafts again. Just do the 203-205 doubler and be done. You already have the adapter for your transmission to the 203, buy a doubler kit (Jed's, ORD, etc) add the 205, fab some shifters, and just do the driveshafts once.

The doubler won't affect daily driving it's still 1:1 in high range, but then you get 1:1, ~2:1 and ~4:1. Plus if you do the shift rail mod to the 205 you can get 4WD (hi/lo/lo-lo), FWD(hi/lo/lo-lo), and RWD(hi/lo/lo-lo).
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Old 05-31-2010, 10:43 PM   #11 (permalink)
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alright.. did some thinking..
right now, im not interested in a 203/205 doubler set up. getting a doubler is just not in the budget right now, and i want to get the 4wd working properly as soon as i can. i am getting a rebuilt 205 for my birthday, and i have a few questions.

there has been mention of drive shafts needing to be redone. why? will they need to be longer with the 205 in there?
what about the cross member? will i need a 205 specific cross member?
and finally.. intermediate housing. i have a c6. when i get this new 205, should it come with the intermediate housing?
if not, will the one from the 203 work? if not, where do i get an intermediate housing?
and do these new t-cases come with the shift linkage?
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