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  1. #1
    Join Date
    Mar 2001
    Location
    Atlanta, Texas
    Posts
    1,245

    Post

    What are you guys using? I need to do this again.
    2001 JUICED GMC 2500HD SLE AlliMax, Longbed, Ext. Cab, 4X4 Summit White, G80 Differential, Husky Liners, Black UWS Toolbox, Black Westin Nerfs, Black Replacement Front and Rear Bumper, Black Bedrail caps, Autopage 2 way LCD Alarm remote start,JL Audio, Hella, Cobra, ProComp Mud Terrains, Tekonsha Prodigy Controller, Fumoto, Rhino Liner, 400 Watt Inverter, Pioneer XM Radio<br />KENNEDY 4\" Exhaust. 100,000 miles on January 31,2003!!<br /><a href=\"http://home.att.net/~markstanco\" target=\"_blank\"><b>PHOTOS UPDATE 11/02</b></a><br /><br />Gutter Pipe is your friend. Leafblower is your enemy.

  2. #2
    Join Date
    Jun 2002
    Location
    Colorado Springs, CO
    Posts
    139

    Post

    Alli-max,

    I am curious as well. The manual indicates you should the SAE 80W-90 as compared to the rear axle fluid of SAE 75W-90. Can you use a heavier weight as others have indicated for the rear using the 75W-140??

    How soon should you change the oil in the front Diff anyway?

    BTW, creative job on the RAM Air! I will be curious as to the overall benefit.
    Don
    DP Member 9428<br />2002 Chevy 2500HD LT, D/A, Ext. Cab, SB, Dark Carmine Red/Med. Grey.

  3. #3
    Join Date
    Mar 2001
    Location
    Atlanta, Texas
    Posts
    1,245

    Post

    You and me both (about the airdam)...

    I dont see the benefit of heavier weight oil unless towing in 4WD with a load.
    2001 JUICED GMC 2500HD SLE AlliMax, Longbed, Ext. Cab, 4X4 Summit White, G80 Differential, Husky Liners, Black UWS Toolbox, Black Westin Nerfs, Black Replacement Front and Rear Bumper, Black Bedrail caps, Autopage 2 way LCD Alarm remote start,JL Audio, Hella, Cobra, ProComp Mud Terrains, Tekonsha Prodigy Controller, Fumoto, Rhino Liner, 400 Watt Inverter, Pioneer XM Radio<br />KENNEDY 4\" Exhaust. 100,000 miles on January 31,2003!!<br /><a href=\"http://home.att.net/~markstanco\" target=\"_blank\"><b>PHOTOS UPDATE 11/02</b></a><br /><br />Gutter Pipe is your friend. Leafblower is your enemy.

  4. #4
    Join Date
    Oct 2001
    Location
    Ct.
    Posts
    3,060

    Post

    Same as rear ... I'm useing AMSOIL synthetic .......

    Others are useing MOBIL , RED LINE , pick one and due it ......

    So whets the deal on the drain pipe air inlet???? Any gains ...... ? If your gonna drive through some deep puddles, carry an elbow and a short piece of gutter and you can go snorkeling ...... [img]tongue.gif[/img]

    MAC

  5. #5
    Join Date
    Apr 2001
    Location
    Southern Minnesota
    Posts
    1,202

    Post

    Mark, I'm running 75w-90 Mobil 1 front and rear.

    Use the stuff in all my differentials, and it's good oil!! My old drag truck's diff has over 300 passes on the gear set (4.56 9" Ford), with no wear what so ever, and that was behind a 600+ HP 406 SBC and a trans brake equipped 'Glide. I plan to run the same gear set again behind my new 427 SBC equipped racer.
    2003 Chevy 2500HD LT EC/SB D/A <br />Dark Gray, loaded..<br />Kennedy 4\" Exhaust, Headlight Harness, Access, Air Lift, Luverne, <br />Hot Juice, Mega Filter, more....<a href=\"http://community.webshots.com/user/somndmax\" target=\"_blank\">Pics</a><br /><a href=\"mailto:somndmax@yahoo.com\">somndmax@yahoo. com</a>

  6. #6
    Join Date
    Mar 2001
    Location
    Atlanta, Texas
    Posts
    1,245

    Post

    I've got the Mobil 1 in the rear myself to SoMn... Guess I will put it in the front this weekend.

    Mackin.. I dont think you are supposed to go through water that is ABOVE the lowest part of the rim IIRC.
    2001 JUICED GMC 2500HD SLE AlliMax, Longbed, Ext. Cab, 4X4 Summit White, G80 Differential, Husky Liners, Black UWS Toolbox, Black Westin Nerfs, Black Replacement Front and Rear Bumper, Black Bedrail caps, Autopage 2 way LCD Alarm remote start,JL Audio, Hella, Cobra, ProComp Mud Terrains, Tekonsha Prodigy Controller, Fumoto, Rhino Liner, 400 Watt Inverter, Pioneer XM Radio<br />KENNEDY 4\" Exhaust. 100,000 miles on January 31,2003!!<br /><a href=\"http://home.att.net/~markstanco\" target=\"_blank\"><b>PHOTOS UPDATE 11/02</b></a><br /><br />Gutter Pipe is your friend. Leafblower is your enemy.

  7. #7
    Join Date
    Oct 2001
    Location
    West Point NY
    Posts
    149

    Post

    Is there a drain plug on the front diff like the rear? Or is it a cover and gasket?

    No I am not that lazy to go look...truck is at home and want to get the stuff to do it this weekend on the way home.......
    2002 Chevy 4x4 CC D/A <br />Jayco 325BHS <br /> <br />http://community.webshots.com/user/majburns

  8. #8
    Join Date
    Nov 2001
    Location
    Iron Ridge, Wisconsin
    Posts
    28

    Post

    MABurns

    No cover......just a drain plug.

  9. #9
    jbplock Guest

    Post

    MABurns,

    If you're putting synthetic oil in the front Diff check the color of the plastic vent cover. If the cover is "black" it has to be changed to a "white" one (PN 12479296). The Black cover is not compatible with synthetic oil. (See http://service.gm.com/gmtechlink/ima...e.html#story13 for more info). I recently changed the front & rear diff oil to Mobil-1 75w90 on my 2003 and I had to replace the black cover with the white one. Cost was $20.
    [img]smile.gif[/img]

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