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Help me identify my T-Case

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by K5on38s, Jan 8, 2003.

  1. K5on38s

    K5on38s Registered Member

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    if you guy got any pic /forums/images/graemlins/deal.gif i could look at this way i can eliminate the ugly "?" in my profile.. /forums/images/graemlins/1zhelp.gif
     
  2. POWERMAD

    POWERMAD 1/2 ton status

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    I don't have any pics of one but it should be a 241 if it is original.
     
  3. 95 Silverado

    95 Silverado 1/2 ton status

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    It should have an aluminum case, look on the back of the case, should have a round metal tag, it will be marked 241C, if it's the original style case.
     
  4. K5on38s

    K5on38s Registered Member

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    241's where the only ones used in blazers?
     
  5. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    in '89 they were
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Here is the chronolgy of T-cases.

    73-79, majority came with the NP203. Fulltime case, 2.01:1 low range chain driven with a cast iron case
    73-80, NP205, mostly behind the SM465 4 speed. It was the only T-case offered in 1980 and came behind all trannies. 73-79 versions were fixed yoke, 80 was slip yoke. 1.96:1 low range, gear drive and cast iron
    81 saw the introduction of the NP208 which came behind all available trannies. It was chain driven, aluminum case, 2.61:1 low range with a slip yoke output. It was replaced with the 241 in 89. The 241 is similar to the 208 but has a 2.72:1 low range. It is also slip yoke output but a slip yoke eliminator is avaialble through the aftermarket. 89-91 241's were found behind every available tranny also.

    Hope that helps some!

    Rene
     
  7. K5on38s

    K5on38s Registered Member

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    Ok i got 2 other Q's
    1: the sm465.....was that low,1st,2nd,3rd... (cause my dads old truck has a tranny like that (79 gmc 3/4ton....ive beeen hounding him for a few years to lemme take the part off it /forums/images/graemlins/deal.gif )

    2: is the 241 any good? i dont do ALOT ove wheeling but i do go to a pretty nasty "local mud hole" and i dont wanna be beatin on a shitty t-case)
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The shifter for a SM465 is labelled as L-1-2-3...I routinely call L first etc etc.

    Ratios' are 6.55:1, 3.58:1, 1.70:1, and 1:1

    The 241 isn't a bad T-case, but it does have it's known weak areas. The Hi-Lo shift collar doesn't take much abuse so always make sure you shift between hi and lo range as per the instructions on the visor...it will not tolerate being shifted between ranges while moving at all.
    The other weakness is the aluminum case...a good skid plate is mandatory.

    With a good skid and a slip yoke eliminator it is a good T-case with a decent low range.

    Rene
     

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