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sparkn.rich

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i here the np205 is what i want to get....i shop for them and it seems maybe i need a little more knowledge before i buy one....like i didnt even know they could get married! general things i may want to look for when buying etc. thanks
motor 350 tranny 700r4
 
All our transfer cases are married transfer cases. Since you have a 700r4 you are going to need a few parts, including the T350 adaptor, NP205 that was behind a T350 (27 spline input), and there is an adaptor that you need to go into the trans/tc adaptor. You will also most likely need to replace the drive lines, since the 205 is the shortest TC setup in our trucks. It is relatively easy, but you should know what you are getting yourself into. Also, search the site for NP205 installations behind the 700r4, there is a ton of information here, and this has been done a lot.
 
38377k5 said:
What he said ^^^^

Tell us more about the truck, putting a 205 behind isn't too tough but may not be worth the time, money and effort.
Click to expand...

what both these guys said, the 205 has a great rep for being strong, but its low range sucks and its heavy. Big motor mud truck yah sure 205, more of a dual purpose rig, 241 is your gem.
 
reply to all

i like this yall are making me think before i do something stupid....why i want or think i want one is cause i read it is king of bullet proof....and i have a tendency to tear stuff up....do i think the 203 is broke well not till couple days ago when it was little slick outside i put it in what i think is 4 high i will explain later why i think..and it seems like either when it shifts or somwhere close to that up or down maybe not even tied to shift but only in 4x4 not 2wd there is a pop that will scare the snot out of you....this is at slow speeds 10-15mph its only half mile to work so i carried on drove home at lunch parked it. so with that said my uses for the truck will probably be pull boat on occasion so fish dont bite i go find a mud hole...just something to play with hadnt planned on alot of trips in it but who know..i am telling you i am green rookie at this 4x4 thing...as far as that bang not sure it happens in 4low havent been there yet i dont think heres why.....its a 203 my understanding is they are all time but my hubs in front lock so maybe a conversion...i got alot of homework to do! thanks again yall.
 
So are you sure you have a 203? big heavy iron case that is fulltime 4x4 that never came from the factory behind a 700r4? You might have an aluminum cased 208 that has part time 4wd, your shifter has 2high at the top followed by 4 high, neutral, and ends with 4 low.
 
What year is your Blazer? Do you have any pictures? I assume you have an NP208, not an NP203.

It probably just needs a new chain.

Martin
 
82355 said:
Why do you think you need one>?

Martin
Click to expand...

cuz then the d60 and 14bff with 5:38's are next!!!! :whistle:


yeah seriously.. depends on what you are looking for..
i had a 203 and it took ALOT of abuse...

to really confuse you.. you can use part of your 203 with your 205 and make a better gear reducer....

but first figure if yours is broke or not..
 
I'm thinking a 208 as well...

I would spend a little more time figuring out what you have and if it's really broken... There's a lot more to just buying a t-case that everyone says you need and throwing it in a rig than you are expecting...

I would slow down a bit and get to know your truck...
 
transfer case

i have looked online at several pictures and a 203 looks almost like a 205 from one side except that it doesnt have that 3 bolt thing in the middle..looking towards the front of rig at the back of case.i will get some pics up i just got back from talking to a friend that said it sounds like since i didnt have any problems with it in the mud as far as the knock goes but did on the street then the ratios or something in the axles may be different...and on that 205 203 combo or doubler i looked at that, but starting thinking i may need start somewhere like here first....
 
not sure what it is but sounds fun... i really like that 383 vortec setup {here comes the laughs} with what you said and that 205 and that 383 can i have fun? {this is reply to that 14btt and 5 sumthins d60s}
 
No transfer case looks like the 205. The 203, 208, and 241 look very similiar to each other with a large planetary box attached directly to the trans, then the torque splitter portion with the chain.

NP203 behind a T350:
th350np203.jpg


NP205
np205c-27large.jpg


Notice on the 205 that there is basically no extension off the input, it is flat across the front to the front output. The 203 has an extension, then the differential/chain section with the front and rear outputs.
 
Also most t-cases still have the tag attached to them. It is right next to the rear output on the t-case on all of them (203,205,208,241)
 
and where mine shifts theres like two linkages there and sometimes one will go then the next click both might go but its crazy it feels like i can count about 7 clicks 2 or 3 are neutral and its a bear to get back in 2 hi you gotta caress it then slap it around awful fun another reason i want sumthin else
 
If you have the same transfer case as in the first link you listed then it should be a 203. They are big and heavy, and also very strong cases. Normally you have 5 positions on the shifter, starting at the dash and working back:

4 lo lock
4 lo
Neutral
4 hi
4 hi lock

I am trying to remember for sure, but it is either that or reversed, but I think that is the layout. In a 203, unless someone has put a part time kit in, the front and rear are always engaged, and through a 'differential' setup in the transfer case the power is split. They are relatively easy to find, and you could swap one in if you don't feel comfortable attempting to tear down and diagnose your current unit.

Getting into swapping to a 205 on yours is going to be a pretty major undertaking. You are also looking at some pretty good expense involved. So the question is, and think seriously about it, what do you want to do with the truck? What year truck are we talking about?

If you have hubs up front you can unlock, and the 203 still moves the truck with the hubs unlocked, someone has probably put a part time kit into the 203 to allow 2 wheel drive operation. This basically replaces some gears in the transfer case to allow the power to go to the rear driveline when the front is unlocked at the hubs. In that case, finding another 203 will mean either finding one with a part time kit installed already, installing a part time kit in a normal replacement 203, or diagnosing yours. Everyone here can help you if you want to attempt to diagnose the transfer case. It may be something simple that you can do quickly, and it will save you money in the long run to fix what is broke rather than just swapping parts.
 
first things first

i guess i need to find out why it pops or binds up when in 4x4...take care of that first.....what i want the truck for is ,if possible, pull my boat to the lake if fish dont bite, play in some mud......it does appear to have had this conversion done i had my wife look at the drive shaft going to front it doesnt turn unless i put it in 4hi or lo and it has the hubs that say free and lock but havent found anything saying warner etc....my long term for it is to learn from it have fun with my 2 sons turning a wrench and get me a much nicer one later and do that 383 vortec combination and really make a hobby out of it. i like drag racing and so far this mud thing sound fun so maybe mud dragging but thats after my wife get her nursing dgree in 4 more months...runs off with a doctor and leaves me with nothing but truck if lucky
 
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