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  1. #1

    Default What fluids need to be changed?

    So Im fixing to pass 20,000 miles from when I bought my truck from the dealer and Im curious about what fluids need to be changed and what kind of fluids you guys use. I just had the transmission fluid flushed right after I got it because we were trouble shooting some shifting problems which turned out to be the computers fault.

    Is there anything else besides the Oil/Oil filter, Transmission fluid/transmission filter/ Transmission pan gasket (I have a small leak also), and the rear differential fluid? Is the fluid in the differential the only thing that needs to be changed or is there something else? Also I have a small leak on the front of the rear axle. Its where the drive shaft connects to the axle. Could it be a seal busted or something similar. I looked around on autozone.com and I couldn't find the seal for it, but I dont know what its correct name is haha so I might have passed it up.

    Thanks.
    Bagged 06 Silverado Crew Cab.

  2. #2
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,356

    Default

    What is the actual mileage on your truck? Look in your owers manual it has all suggested change intervals for the fluids.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  3. #3

    Default

    The mileage Is about 78,000. The truck didn't come with a owners manual. I would like to change all the fluids around the 20,000 - 25,000 mile range.
    Bagged 06 Silverado Crew Cab.

  4. #4

    Default

    Change it all! ...Thats what i did! Rather be safe than sorry!
    debadged. k&n CAI. TBS. flowmaster. 20's. smoked tails. ..much more..

  5. #5
    Master Mechanic Silverado Junkie's Avatar
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    Feb 2010
    Location
    Lead Hill, Arkansas
    Posts
    541

    Default

    The biggest cause of a leaky pan gasket is overtightning it. As far as what fluids to use, use the tranny fluid GM recomends and for oil; ive always used castrol GTX and Lucas Oil Stabilizer with a K&N oil filter. Its the only way to go.
    1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes

  6. #6
    Legend

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    Default

    Quote Originally Posted by ZSI52 View Post
    The mileage Is about 78,000. The truck didn't come with a owners manual. I would like to change all the fluids around the 20,000 - 25,000 mile range.
    You should be able to get one online for your truck. It will have all the recommended fluids and the intervals in it. Or maybe someone can give you what you need from theres for their same year truck
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  7. #7

    Default

    I feel like I'm fogeting something. Is there any other fluids that need to be changed when I change the rest. I've been using valvoline with a K&N oil filter. I'm Just not sure what to use for the differential or transmission
    Bagged 06 Silverado Crew Cab.

  8. #8
    Master Mechanic bigdaddy77084's Avatar
    Join Date
    Jan 2010
    Location
    Houston, Texas, United States
    Posts
    649

    Default

    Antifreeze,power steering,brake fluid. I just got my Tahoe in December and I changed anything that had an oil,fluid,filtered,antifreeze in it.
    I have to take care of the old girl now the bank took my ford back.
    Couldnt afford repairs on it..
    95 tahoe 2dr 4x4 200,000+ miles

  9. #9

    Default

    Ok so is this all I need to replace? I found a manual online and this is what it said.




    Automatic transmission fluid - Dexron - VI
    Rear Axle - SAE 75w-90

    What about a transfer case? Or is that only on 4WD's haha



    How many quarts do I need of each fluid? Sorry I'm a complete Noob when it comes to this stuff. If it's electrical I can figure it out but this stuff is confusing to me haha
    Last edited by ZSI52; 03-06-2010 at 08:32 AM.
    Bagged 06 Silverado Crew Cab.

  10. #10

    Default

    I would be careful when you change everything in your transmition, it could have negative effect, I changed everything in a 97 silverado and it shocked the transmition and ended up having to get a rebuilt so now as long as my filter isn't bad I leave it in.

    My transmition takes 6 quarts, 2 in torque converter and 4 in trans and lines, but thats a 700r4 not positive if its the same , and I don't know about the rear end...but yes a transfer case is only on 4wd lol
    Last edited by ThatSilverStepside; 03-06-2010 at 09:13 AM. Reason: because I need to learn to read the whole post.
    Justin
    1990 Silverado Stepside



    2003 Olds Alero-
    64,XXX

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