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Thread: fluid change

  1. #1
    Join Date
    Jul 2011
    Asheville, NC

    Default fluid change

    Hey guys. I'm planning on doing a full service on my truck. 98 k3500 dually NV 4500 trans. I was wondering what you guys preferred on fuid types and additives. Differential fluid called for 80w90 and posi track additive. But I'm really not sure if it is posi track. Or synthetic with limited slip? Plus what kind of gear oil for the trans? I know some of the older chevy called for syncromesh or ATF. I'd appreciate all advice.
    98 K3500 dually with nv4500 trans and 410gears. k&N air filter, instant heat glow plugs, dymond eye exhaust, 3" down pipe 4" back, fsd heat sync w/out resister.

  2. #2
    Join Date
    Feb 2007
    Baja California Sur Mexico


    Look in the glove compartment for the vehicle options, and google GM options to find which diff you have, posi track must have the additive to prevent wear on the clutches. The oil for the nv4500 is special, Pensoil has one at half the price of the GM one, google that as well.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Dec 2008
    Otsego, Mich


    I have always change my diff oils with Synthetic Amsoil in my trucks for heat and extra prevention against tooth form galling from high pressure. With G80 code I add the posi additive from Autozone or wherever.
    Amsoil has done alot of testing on how different 80-90w oils hold up against theirs. I believe you can find the results on their webpage. I used to think Mobil 1 was good 80-90 until I saw their data,
    97 2500 6.5, downpipe, exhaust, K&N #9 resis in PCM w/ cooler, B&M trans prog., 183,000 mi
    98 3500 6.5, dually dump, downpipe, straight exhaust, K&N #9 resis in PCM w/ cooler, B&M trans prog, marine injectors, Western plow, engine rebuilt @231,000 mi
    1993 GMC TopKick 50 boom trk w/ 3116 Cat
    1968 Plymouth RoadRunner, built 383 auto
    2005 Honda VTX 1800, with all the go fast goodies
    1974 Plymouth Cuda , project yet
    1994 Dodge Viper , 7000 miles
    New truck payment "NOT IN THE PLANS"

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