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T-case swap questions

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by greatwhitenorth, May 29, 2002.

  1. greatwhitenorth

    greatwhitenorth 1/2 ton status

    Mar 10, 2002
    Likes Received:
    Surrey, BC
    I tried searching, but I wasn't finding the info I was after..

    What is involved in swapping a SM465/NP208 to a NP205 transfer case????

    The SM465 would have a 10 spline output shaft right?? So all that is needed then is a Sm465-NP205 adapter and sleeve; and of course the 10 spline input NP205???

    Will the SM465/NP208 cross-member work for the 205 adapter??

    Drive shaft mods will be required right?

    Sorry for all the questions guys; any information will be appreciated.

  2. Mudstud

    Mudstud 1/2 ton status

    May 29, 2001
    Likes Received:
    Memphis, TN
    Check this http://www.offroaddesign.com/NP205tech.htm

    There is one thing I've read on here that I don't think is covered in the article and that is...
    Pre 85 4x4 465 had 10 spline output with a 10 spline 205.
    After 85 4x4 465 had a 32 spline long input with 32 spline 205.
    I'd give credit to whoever wrote that but I don't remember.
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Jul 23, 2000
    Likes Received:
    E-town baby!
    The SM 465/NP 208 combo is also 32 spline...from 81 and up when the 208 was intro'd.

    I swapped my old SM465/NP 208 out in favor of a SM 465/NP205. I bought a 465/205 combo rather than trying to mate a different T-case to the tranny I had. 465's are cheap enough that the extra cost was negligible...

    I had to re-drill crossmember holes, and needed to lengthen the rear shaft and shorten the front shaft. The 205 shifter fit in the hole where the 208 shifter box used to be...

  4. dyeager535

    dyeager535 1 ton status Premium Member

    Dec 13, 2000
    Likes Received:
    Roy WA
    As others have mentioned, the NP208 465 will ahve the 32 spline extra long output shaft.

    If I were you, I'd keep the 208 until it broke (if you haven't done so already) and just be on the lookout for a good deal on the 465/205 combo.

    IMO there isn't anything inherently wrong with the 208, except the slip yoke...of course the 205 is stronger and will last longer, but you lose a bit of power through it also compared to the 208. Plenty of 208's have held up to some pretty stout motors, but the real weak link seems to be when you toss the rear shaft, the housing gets cracked.

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