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Transfer Case Questions

Discussion in 'The Garage' started by RustBuket, Sep 28, 2003.

  1. RustBuket

    RustBuket 1/2 ton status

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    I recently purchased an 81' blazer that was all stock. Now, it has a rebuilt motor and edelbrock manifold, headers, dual exhaust, and emissions equip. removed. When I put in in 4lo I get a whine from the transfer case. I was just wondering if this is normal or not? I wanted to check the fluid level but was not sure how or what to oil to but back in if I did change it. I was looking @ the T-case the other day and there are too plugs on the back side. One up high and one at the bottom. I was wondering if these would be the drain/fill plugs? Also, what oil do you put in differentials? I am going to change those as well because I don't know what the last time the PO did that. Any help is appreciated! /forums/images/graemlins/ears.gif

    P.S. What type of T-case would I have? NP203?
     
  2. Muddytazz

    Muddytazz 1 ton status

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    80 - 90 gear oil for the diff's

    You should have a NP205 in your 81, what fluid to use on it i have no idea all i know is a NP203 takes 30w motor oil.
     
  3. RustBuket

    RustBuket 1/2 ton status

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    How can i make sure I have an NP205 cause thats sweet if I do! Also, more input on drain/fill plugs + what type of oil to use would be appreciated. /forums/images/graemlins/thinking.gif
     
  4. MTBLAZER89

    MTBLAZER89 3/4 ton status Premium Member GMOTM Winner

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    I believe the same gear oil mentioned above for a 203 or a 205 is right. There was gear oil in the 203 I drained the other day /forums/images/graemlins/thumb.gif As for the diff this is a 203
    [​IMG]

    This is a 205

    [​IMG]
     
  5. RustBuket

    RustBuket 1/2 ton status

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    Ok thanks guys! I think I have an NP205 just lookin at the pics but I'll have to double check. Thanks for the tips.
     
  6. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Look for a small round plate with 3 bolts on the rear of the case, also look for the tag on the passenger side front it will say NP205 or New Process 205.
     
  7. RustBuket

    RustBuket 1/2 ton status

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    I'll check as soon as there is light!
     
  8. 75-K5

    75-K5 3/4 ton status

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    Another easy way to tell is look at the shifter. If you have 2hi, 4hi, and 4lo, then you have a 205. If you have L LOC, L, H, H LOC then you have a 203.
     
  9. RustBuket

    RustBuket 1/2 ton status

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    Well its a 205 then! Is the 205 stronger than the 203?
     
  10. 75-K5

    75-K5 3/4 ton status

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    Well, the 203 is chain driven and the 205 is gear driven. Both are very strong, but the 205 wins the contest.
     
  11. doctor4x4

    doctor4x4 1/2 ton status

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    a lot of 1981 had the 350 tranny with a 208 tcase Is it a ALUMINUM CASE????
    if so then 208 it is
    what size head does the drain and fill plugs have on it 9/16 or
    1 1/8"???
     
  12. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    yep, if it's aluminum than it's a 208 and they have 2hi,4hi,N,4lo like the 205. Maybe you will get lucky and have a 241 late model case swapped in like mine does in my 85. /forums/images/graemlins/thumb.gif
     

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