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Another question.. what weight oil in differential??

Discussion in 'The Garage' started by XHitman396, Jul 22, 2006.

  1. XHitman396

    XHitman396 1/2 ton status

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    so what weight oil should i put in a 14bff and my 10 bolt front?? Ive never even bought any before, and the guy at the parts store triple guessed himself. so, whatcha got?? thank you..
     
  2. readymix

    readymix 3/4 ton status

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    80-90w
     
  3. sled_dog

    sled_dog 1 ton status

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    I always just use 80-90 as well
     
  4. MTChevy

    MTChevy 3/4 ton status Premium Member

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    regular old 80-90 in an open diff is what i use
     
  5. muddybuddy

    muddybuddy 3/4 ton status

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    i use 80-90. some guy who claims to build rock crawlers says that 80-140 or something works better in diffs with lockers. i duno if hes right tho.
     
  6. sled_dog

    sled_dog 1 ton status

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    70-140, its synthetic gear lube. thinner, Mazda/Ford use it in their tcases(the Ford Escape/Mazda thinger). Yeah I say use 80-90, nothing wrong with it in any instance, just use limited slip additive when you have a limited slip diff.
     
  7. Pookster

    Pookster 1/2 ton status

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    check and see, most 80/90's have LSD additive.

    "consider" 140 if your going to be towing in hot weather. Synth is good, but if you play around a lot in water/mud, you'd be changing it all the time anyways.
     
  8. muddybuddy

    muddybuddy 3/4 ton status

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    so if your plannin on taking a 275 mile trip each way to the beach, it prolly would be best to put in the 70/140 synthetic right?:) i just finished the break in period for my yukons/detroits so i need to change the fluids anyways.
     
  9. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    I'd stay with 80/90 the biggest reason for going to a higher weight oil is heat. If you aren't building a lot of heat in your diff (like when you do towing) just run 80/90
     
  10. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    for a light-use rig / DD, what would be the best synthetic to use? My ranger has a tiny diff.. couldn't take much fluid and it hasn't been changed (as far as I know!) since it was built in 94...

    j
     
  11. muddybuddy

    muddybuddy 3/4 ton status

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    a long road trip would build up alot of heat right? would puttin 70/140 eliminate the need to stop frequently to allow it to cool down?
     
  12. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    I think 80/90 is fine for your use. If you are having to stop to let your diffs cool then something besides gear oil is very wrong.
     
  13. muddybuddy

    muddybuddy 3/4 ton status

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    alright cool. well i only mentioned frequent stops because it was advice that was given to i believe it was avery bout driving like 200miles to the beach in cali.
     
  14. sled_dog

    sled_dog 1 ton status

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    if you gears are fully broken in, there should be no need to stop all the time. Now if they aren't done the break in period, yeah giving it a break is a good idea.
     
  15. Smitty

    Smitty 1/2 ton status

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    So, is there any reason to not run 85W140? The manual for my Detroit says to use mfg recommend oil (80-90). The manual for my Lock-Right says to use 85-140 to reduce the noise. Figured I'd just go with the 85W140 in both since I'm in sunny Florida.
     

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