Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

NP241+Gear oil=ok?

Discussion in 'The Garage' started by BowtieRed, Oct 23, 2003.

  1. BowtieRed

    BowtieRed 1/2 ton status Author

    Joined:
    Dec 31, 2002
    Posts:
    1,776
    Likes Received:
    0
    Location:
    Winston-Salem, NC
    just curious, if i could run 80/90 gear oil in my 241 because it's leaking at the tailshaft because it's bent, i was thinkin it might stay in a little better with gear oil. is it ok?
     
  2. Shaggy

    Shaggy 3/4 ton status

    Joined:
    Dec 15, 2000
    Posts:
    6,737
    Likes Received:
    0
    Location:
    Los Banos, CA
    Sounds like a lazy man's fix to me. I guess that the tranny is more or less ruined already though, so you might as well give it a shot.
     
  3. BowtieRed

    BowtieRed 1/2 ton status Author

    Joined:
    Dec 31, 2002
    Posts:
    1,776
    Likes Received:
    0
    Location:
    Winston-Salem, NC
    say what?
    dude- i just need to drive it until i can afford a new mainshaft. nothing wrong with my tranny. it's leaking at the output shaft to the rear driveshaft.
     
  4. Shaggy

    Shaggy 3/4 ton status

    Joined:
    Dec 15, 2000
    Posts:
    6,737
    Likes Received:
    0
    Location:
    Los Banos, CA
    After running gear oil in it there may be something wrong with it, is all I'm saying... The thicker oil will have a harder time getting into all the nooks and crannies to get the bearings properly lubricated.
     
  5. Pookster

    Pookster 1/2 ton status

    Joined:
    Nov 21, 2000
    Posts:
    3,195
    Likes Received:
    0
    Location:
    NYC, NY, USA
    thought the 241's were like the 208's and used ATF. ....

    DOUBLE CHECK!
     
  6. Fubeca

    Fubeca 1/2 ton status

    Joined:
    Dec 18, 2002
    Posts:
    2,100
    Likes Received:
    2
    Location:
    Denver Area
    I'll have an extra shaft in a week or two when I get my SYE kit from High Angle Driveline. Let me know if you are interested.
     
  7. sapper

    sapper 1/2 ton status GMOTM Winner

    Joined:
    Jul 11, 2001
    Posts:
    3,052
    Likes Received:
    0
    Location:
    NoVa
    They DO!!!
     
  8. sled_dog

    sled_dog 1 ton status

    Joined:
    Sep 3, 2002
    Posts:
    16,870
    Likes Received:
    0
    Location:
    Austin, TX
    [ QUOTE ]
    thought the 241's were like the 208's and used ATF. ....

    DOUBLE CHECK!

    [/ QUOTE ] his point is the gear oil is thicker so it will leak less.
     
  9. fortcollinsram

    fortcollinsram 1/2 ton status

    Joined:
    Nov 8, 2001
    Posts:
    2,261
    Likes Received:
    0
    Location:
    Fort Collins, CO
    Don't do it...The caged needle bearings in the 208 and 241 are designed with the use of ATF in mind...80/90 is WAY to thick for that...I say deal with it leaking or you are gonna end up needing a complete t-case rebuild...
     
  10. 87sm465np208

    87sm465np208 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    1,114
    Likes Received:
    0
    Location:
    illinois
    yep at a shop that i was at once the guys were puttin gear lube in a 208, and i said guys no, you need to put dextron 3 in that thing, and they just said, were puttin in what we took out, and the head guy said yep, it might be worn out so bad that they put gear lube in it to quiet the noise. /forums/images/graemlins/thinking.gif
     
  11. 87sm465np208

    87sm465np208 1/2 ton status

    Joined:
    Aug 28, 2002
    Posts:
    1,114
    Likes Received:
    0
    Location:
    illinois
    and have you tryed replaceing the seal? /forums/images/graemlins/ignore.gif
     
  12. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

    Joined:
    Feb 23, 2001
    Posts:
    3,369
    Likes Received:
    0
    Location:
    Chicago, IL
    I really doubt that the internal pump in your 241 has the uumph to pump 80/90 weight. You'll cook that transfer case in real short order IMO. GM didn't invest millions in designing this stuff... I tend to trust their specs!

    Just my .02!

    -Dan
     
  13. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

    Joined:
    Aug 28, 2002
    Posts:
    9,095
    Likes Received:
    144
    Location:
    california
    my 241 had gear oil in it when I bought it and it was low so I just added ATF after that. Mine leaks and pops out of 4hi. It will only hold about a quart maybe 1 1/2 quarts. Don't know if the gear oil screwed it up or not but I don't care because I'm going to have it rebuilt in a week or 2.
     
  14. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    [ QUOTE ]
    I really doubt that the internal pump in your 241 has the uumph to pump 80/90 weight. You'll cook that transfer case in real short order IMO.

    [/ QUOTE ]

    I agree with you that it shouldn't be used, but I have found gear oil in transfer cases before and it didn't seem to damage them.
     
  15. wrathORC

    wrathORC 1/2 ton status

    Joined:
    Apr 27, 2002
    Posts:
    908
    Likes Received:
    0
    Location:
    Hancock, MI
    GM's recommended fix for leaky/noisey transfer cases has been to add gear oil. My Dad's NP241 has been half gear oil for at least five years and is probably now approaching all gear oil. The truck has twice the miles as mine and still doesn't make the noise nor the popping that my NP208 does. My NP208 only leaks about a quart every two months though. My Dad's leaks out that fast with gear oil in it and with ATF it leaks out a quart and a half in a week and stabilizes.

    I'd replace the seal (even though the shaft is bent, it might have more springyness in it and seal better than the old one) for $4 and use a quart of gear oil mixed with the other few quarts of ATF.
     
  16. Sample

    Sample 1/2 ton status

    Joined:
    Oct 15, 2002
    Posts:
    536
    Likes Received:
    0
    Location:
    Apache Junction, AZ
    Use 10w30 motor oil.
     
  17. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

    Joined:
    Feb 23, 2001
    Posts:
    3,369
    Likes Received:
    0
    Location:
    Chicago, IL
    The 241 is unique from most cases (205 and 208) in that its the only one that has a pump. I've installed one of these pumps before after seeing one burn up and take the chain and then the case with it. After recently rebuilding my 241... I sure wouldn't recommend [darn]-ing around with it unless you have the cash just sitting around to rebuild it!
     

Share This Page