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Discussion Starter · #1 ·
This is a overview of '74-93 married transfer cases and their interchange, or lack there of.

'74-79 RC/TD and '75-79 W-series have the NP203 full-time unit bolted to one of four transmissions.

NP-230 3spd manual, no known interchange with later T-case.

NP-445/4530 4spd manual same as above.

NP-435 4spd manual, output shaft and adapter must be changed to '80-93 to use later NP-205/208/241 T-case, or use later transmission.

A727 3spd auto, output shaft and tailhousing/adapter must be changed to a '80-89 to use later T-case, small blocks can just use a later trans but big blocks must use home built trans to use NP-205/208/241s.

'80-93 Dodge 4X4s have one of six transmissions and one of three T-cases, 205/208/241.

A-727, all T-cases are bolt-ins, 205/208/241.

NP-435, see above.

A-518, 241/205 bolt-up, the 208 does not want to bolt up to the overdrive trans, something about the rear oil seal in the overdrive?

NV-4500, same as above.

G360 Cummins only 29 spline NP-205, no interchange.
 

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{cool}
 

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440 4spd Power Ram said:
A727 3spd auto, output shaft and tailhousing/adapter must be changed to a '80-89 to use later T-case, small blocks can just use a later trans but blocks must use home built trans to use NP-205/208/241s.
just to clarify, One can take a big block trans, swap the output shaft and tailhousing/adapter from a 80-89 trans, to use a 208/205/241.
 

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Discussion Starter · #5 ·
SuperBurban said:
just to clarify, One can take a big block trans, swap the output shaft and tailhousing/adapter from a 80-89 trans, to use a 208/205/241.
That is what I meant by "home built", there are no factory big-block 727s for the 205/208/241, they must be built, poor wording on my part.
 

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Good stuff. Thanks for breaking that down.
 

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joe s said:
So what happens if I have a diesel nv4500 and absolutely must have full time? Are weird hybrids too far off topic? Should be for separate discussion?
Then you will have to bastarise something to make it happen. :p
 

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Discussion Starter · #9 ·
joe s said:
So what happens if I have a diesel nv4500 and absolutely must have full time? Are weird hybrids too far off topic? Should be for separate discussion?
Too easy, either swap the main shaft for a gas unit or take a gas NV-4500 and swap the input shaft for one from a Diesel and then redrill the 203 for the round six bolt pattern of the NV4500.. ;D

I am planning on getting into how to mix and match parts and what can or can't be done, like mating a NP445 to a NP205.

Any info or questions are welcome.
 

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440 4spd Power Ram said:
Too easy, either swap the main shaft for a gas unit or take a gas NV-4500 and swap the input shaft for one from a Diesel and then redrill the 203 for the round six bolt pattern of the NV4500.. ;D

I am planning on getting into how to mix and match parts and what can or can't be done, like mating a NP445 to a NP205.

Any info or questions are welcome.
could you use the "doubler" matting plate and not do the doubler?
 

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Discussion Starter · #11 ·
mopar65pa said:
could you use the "doubler" matting plate and not do the doubler?
I don't think so, the doubler plate just bolts the range box of the 203 to the front of a 205.

My planned mating of the 445/205 is a '80 435 adapter and a custom splined stub shaft to make the output shaft reach the 205s coupler, if it works out there will be pics soon.
 

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440 4spd Power Ram said:
and then redrill the 203 for the round six bolt pattern of the NV4500.. ;D
won't work, look at the front end of the 203, vs the 208, they are different, one protrudes out from the front of the TC, the other does not. Look at MadMax's Nacho build thread, he encountered it doing a doubler on a 518.
 

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Discussion Starter · #15 ·
SuperBurban said:
won't work, look at the front end of the 203, vs the 208, they are different, one protrudes out from the front of the TC, the other does not. Look at MadMax's Nacho build thread, he encountered it doing a doubler on a 518.
You are right about the lack of coupler/input shaft depth with the 203 vs 205/208/241s.

It is not something I would do but I have seen it done once, there is less than a inch of spline engagement, not a good idea.. {no}

The adapter plate and spud shaft are a much better way to go when using a 203 in whole or in part with a later trans.
 

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I agree that the NP208 will not work with the A518 trans because of the oil seal for the input shaft interfering with the one in the transmission output housing.  Just found this out the hard way.  It could probably work with some modifications though.  Now I'm looking for an NP241 if anybody has one?
 

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I have one but I'm not very close to you.
 

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 ...for a 241, no difference between a gasser 518 and a diesel 518?, will bolt up to either, same-same?  

Good stuff Leon, thanks
- Sam
 

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Discussion Starter · #20 ·
Mad Max said:
...for a 241, no difference between a gasser 518 and a diesel 518?, will bolt up to either, same-same?

Good stuff Leon, thanks
- Sam
The 518 is 23 spline for both the Cummins and gas through '93, so are the '94-up 46RH and 47RH, after that I don't know.. {noclue}

Leon
 
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