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  1. #11

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    cool guys...I think I am just going to run amsiol 75w-90 in the front and rear diffs.Shouldn't hurt anything...Should it?
    Here is what I'm thinking of using...

    https://www.amsoil.com/storefront/svg.aspx?zo=1695636

    What do you guys think?


    03 Chevy Silverado 1500 ext cab Z-71
    79 AMC Spirit GT
    77 Olds cutlass supreme

  2. #12

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    Nothing wrong with that ./....
    When you hear hoofbeats, look for horses not zebras.

  3. #13

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    cool,thats what I'll run then.


    03 Chevy Silverado 1500 ext cab Z-71
    79 AMC Spirit GT
    77 Olds cutlass supreme

  4. #14

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    Does the transfer case have a substitute? And does anyone know the capacity for the front?

    Thanks for the help.

  5. #15

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    Quote Originally Posted by P51-Mustang View Post
    Does the transfer case have a substitute? And does anyone know the capacity for the front?

    Thanks for the help.
    You just put tranny fluid in the t-case unless you have a button on your 4wd switch that says auto 4wd then it would take auto-trak II fluid.I think the front takes just under 2 quarts.


    03 Chevy Silverado 1500 ext cab Z-71
    79 AMC Spirit GT
    77 Olds cutlass supreme

  6. #16
    Jr. Apprentice z71Hauler's Avatar
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    In the 2005 models you so not have to add any posi additives. The manual just says to use synthetic fluid. I have Mobil 1 in the diff with a MagHytec cover (4 quarts). Never had a problem.
    2005 Chevy Silverado Z71 5.3 ext. cab

  7. #17

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    [QUOTE=vms4evr;306253]Thanks Hobey. Yeah I had to add the riding mower since it has mods too!


    We need pictures of that MOWER !!!!!! lol

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC
    WE CAN STICK A DIESEL IN ANYTHING
    SPECIALIZED IN CUSTOM CONVERSIONS OF ANY KIND
    Scott:glasses:

  8. #18

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    I did mine about 1.5 years ago I used Mobil 1 75-90 in both front and rear with no additive in my 2008 NBS. And Valvoline syn ATF for xfer case. I have the AUTO as a option on my 4x4 selector knob if that helps. But Now I am a big beliver on Amsoil after doing a full trans flush with their low viscosity ATF 12 quarts.
    Last edited by afireinside; 12-02-2010 at 12:07 PM.

  9. #19

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    Quote Originally Posted by afireinside View Post
    I did mine about 1.5 years ago I used Mobil 1 75-90 in both front and rear with no additive in my 2008 NBS. And Valvoline syn ATF for xfer case. I have the AUTO as a option on my 4x4 selector knob if that helps. But Now I am a big beliver on Amsoil after doing a full trans flush with their low viscosity ATF 12 quarts.
    Count yourself lucky your transfer case hasn't failed. The Valvoline full syn ATF is good stuff, but it's the wrong product for your transfer case. I'm guessing you don't use the Auto4hi setting much. The only fluid to run in an AutoTrac case is GM's own AutoTrak II fluid. The blue stuff. It has specific friction modifiers and additives to withstand the incredibly fast clutch cycles of the T-case. I believe it's about $10 a bottle, and you only need two.
    When you hear hoofbeats, look for horses not zebras.

  10. #20

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    Quote Originally Posted by 2COR517 View Post
    Count yourself lucky your transfer case hasn't failed. The Valvoline full syn ATF is good stuff, but it's the wrong product for your transfer case. I'm guessing you don't use the Auto4hi setting much. The only fluid to run in an AutoTrac case is GM's own AutoTrak II fluid. The blue stuff. It has specific friction modifiers and additives to withstand the incredibly fast clutch cycles of the T-case. I believe it's about $10 a bottle, and you only need two.
    Well I am looking at my owners manual right now after reading your post and my trucks manual states Transfer Case(Four wheel drive) Dextron -VI Automatic Transmission Fluid

    So the Valvoline Dextron VI ATF Synthetic is correct I use the AUTO most of the winter. I wonder if the old body style uses Autotrack?

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