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i need T-case help please

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by crash1369, Feb 17, 2006.

  1. crash1369

    crash1369 1/2 ton status

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    how can i tell what transfer case is in my truck? its an 88 fullsize auto 4x4, the 88 has a th700r4 for the automatic right? i was told it had an np208 transfer case but i just saw on pirate 4x4, they say that an 88 should have an np241? does anybody know which it has or how i can tell. i am going to be converting it to an sm465 so if it will be coming out regardless so if i have to remove it to find out thats fine also. thanks allot for the help :waytogo:
     
  2. ryan22re

    ryan22re 1/2 ton status

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    should be a little circular tag on the t-case with the numbers on it. if you cant make out 208/241 you may be able to see ratio 2.61 or 2.72 . 2.61 is the 208 and 2.72 is the 241.
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    1988 would be a 208 as the 241 wasn't used until 1989.
     
  4. crash1369

    crash1369 1/2 ton status

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    thanks allot guys, thats what i thought i was told the 241 started in 89 but i was hoping they were mistaken :) guess not. thats ok though ill have a 208 and a 205 now so i just need to decide which i want to use.
     
  5. crash1369

    crash1369 1/2 ton status

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    so could anybody help me with the two t-case's, acording to pirate 4x4 which i realize we have allready established may be wrong but any way, they said the 208 has a lower gear than the 205, is that correct? i also read somewhere the 208 is lighter so wouldnt that mean the 208 is better? but i keep hearing the 205 is the best is there something i dont know? i did read the that the 205 is cast iron or something and the 208 is aluminum so the 205 can take a hit better i guess but is that the only benifit couldnt i just put a steel sheild over the 208, or could i make some kind of crazy super hybrid? :) i was thinking about a doubler but i probably cant afford it, but would it be possible to use the 2 transfer cases i have or does it have to be the 203 and 205(?) ok sorry about the long post but just one more question, what about the 241 what would i have to do to hook it to an sm465, i was told that is the best case to get but would it be worth it when i already have the other two? thanks allot
     
  6. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The 208 is a chain driven aluminum case with 2.62:1 low gearing.
    The 205 is a gear driven cast iron case with 1.96:1 low gearing.
    The 241 has the lowest gearing possible from the factory with 2.72:1.
    The 205 in undisputably the best case you can get. There have been people trying to do a doubler using something other than the 203 range box but not sure if it can or has been done but i'm sure with all the effort it would take to do the 203/205 doubler is the way to go for the bang for the buck.

    From what i'm told about the 241 32 spline they were all the same it is the adapter that changed for each tranny.
     
    Last edited: Feb 18, 2006
  7. crash1369

    crash1369 1/2 ton status

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    so the 208 is no good cuz of the chain? the 203 is also chain driven right? but that is eliminated for the doubler, could i use the 208 range box? thats the 2.62:1 part right? so wouldnt that be better? especially sice i have both allready, all i have to do is make an adapter to hook the two cases together right? or am i really over simplifying it.
    thanks again
     
  8. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The 208 is one whole case, you cannot remove the range portion of that case like you can a 203. Yes the 203 is a chain driven case but like you assumed, that portion is discarded when doing a doubler.
     
  9. uglytruk

    uglytruk 1/2 ton status

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    Soooooo, My question is, should I use one of the 203's that I alredy have behind a specially built 700R4 to get full time and part time 4wd? Truck is '87 Sub 3/4T. The TH400-4.10's is nuts! And you can't use the 4hi anywhere near pavement. One of the trans shops (saved in my favorites) has the special output shaft. So the trans will cost $1500.
    How does the shift lever work? There are two rods. I think my 208(?, '87) has one rod. Anyone have the neccesary shifter partz? What setup/modifications have to be done? this is for a street driven worktruk w/plow. Here's the shaft...
    [​IMG]
    75X. [​IMG] Convert your 4WD with a three speed 350 transmission and 203 or 205 transfer case to a 700R4 overdrive transmission. This Advance Adapter kit comes with a special output shaft. Advance Adapter #50-6900. We can install this shaft when we build your 700 Raptor transmission. Cost $171.00
    [​IMG]
     
  10. uglytruk

    uglytruk 1/2 ton status

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