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To change or not to change fluids?

Discussion in 'Chevy Trucks' started by CK82, Mar 21, 2007.

  1. CK82

    CK82 Senior Member
    Messages: 185

    I was wondering if any of you mechanics out there would recommend having the differentianl fluid changed after a year of summer wear and tear and winter of snow removal??

    Also what about trans fluid and the front end differential??

    Anything else you recommend being done yearly that is important??

    Thanks
     
  2. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 8,574

    Yes, tranny,T-case and diffs every year, it's cheep insurance
     
  3. dodgeguy99

    dodgeguy99 Senior Member
    from mn
    Messages: 272

    every year, oil and grease is cheap but parts aint
     
  4. TTBoy77

    TTBoy77 Member
    Messages: 87

    I would....a couple hours and a couple dollars versus a couple days and a couple thousand makes sense to me. purplebou
     
  5. Gmgbo

    Gmgbo Senior Member
    Messages: 159

    IF you change the fluid in the tranny in your 95 chevy you can kiss it bye bye. From what ive seen if you dont change the tranny fluid every 10-20k miles u might as well not change it all.
     
  6. scottL

    scottL PlowSite.com Addict
    Messages: 1,603

    every spring; Power flush radiator and trans. Change diff's every 18 months. Truck keeps on going and going.
     
  7. AbsoluteH&L

    AbsoluteH&L Senior Member
    Messages: 573

    I have heard this too, of most trannys, regardless of make. So is it better to let it run till it pops if it already has high mileage and no changes from prior owners:dizzy:
     
  8. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 8,574

    :dizzy: Yea! what ever you do don't get rid of that burnt fluid or put a clean filter in that tranny.:dizzy: I mean all the stuff like worn bands, clutch material and water are good for it. Why would you want to drop the pan and adjust the bands??:dizzy:

    I didn't say have a shop powerflush it, what good does that do?
     
  9. AbsoluteH&L

    AbsoluteH&L Senior Member
    Messages: 573

    Let me ask this again. Now read slow so you don't get lost. I have heard that changing tranny fluid in high mileage trucks is bad for the tranny.I have also heard of to many people changing fluid on a high mileage tranny only to have it go within the next few months.By the way who said the fluid was burnt?!
     
  10. Yaz

    Yaz PlowSite.com Addict
    from NH
    Messages: 1,061


    First off on a plow truck if you afford the cheep insurance, I say change it at least every other year depending on how may miles the truck does or how hard it works. I run Mobil 1 in the front and rear diff and synthetic ATF in the transfer case and trany. If you have over 75K, I say don't flush it completely at most a drain and fill. Taking a truck in with over 100K and doing a flush will clean out the varnish out of the valves and there is a 50% chance it will not shift right in few months if not a shorter time.. I have see this happen and friends that are full time mechanics all agree this happens all the time.
     
  11. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 8,574

    [

    Well lets see were you the first post, no, ck82 was then you added your input.
    typing slow for you as you are lost in your own mind:dizzy:

    Changing the filter and fluid IS ALWAYS A GOOD IDEA........

    It is power flushing that causes problems in older trannys.....

    Plus how do you know that(ck82) his fluid is not burnt. (I'm not saying it is)

    Typing slowly for you H&L, I was giving examples of why it is a good idea to do this preventive maintenance EVERY YEAR regardless if mileage as plowing is an extreme environment for running gear.prsport
     
  12. derekbroerse

    derekbroerse 2000 Club Member
    Messages: 2,377

    My ex had an '86 Olds Delta 88 that shifted kinda crummy (late and lazy)and hadn't been changed by the previous owners, so I did a fluid and filter change on it, tranny died within about two weeks--slipped to the point of being undriveable.

    My working theory was that maybe a certain amount of the worn off friction material was suspended in the fluid and was magically allowing the plates to grab still, and once we changed to clean fluid that was it.

    Others on here have reported the same thing.

    Its not like its any kind of a scientific test with proof though, but I wouldn't be suprised either way.
     
  13. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 8,574

    Just using your post as an example.:rolleyes:

    There are a few that blame the draining of the fluid and a new filter as the demise of there tranny.
    They think that if they had left it alone it would have lasted forever.
    Most of these people waited until there was a problem.
    Then they had the tranny fluid changed.

    A new filter and fluid will not fix the tranny.
    It's called preventive maintenance.
     
  14. derekbroerse

    derekbroerse 2000 Club Member
    Messages: 2,377

    I would say that it WAS the demise of the tranny. It didn't slip before the fluid change, just had a bit of a mind of its own. It definately DID slip afterwards. Last forever, no. But more than two weeks, yes. Was kicking myself and wishing I'd left well-enough alone.

    Fluid and filter CAN fix certain issues, especially if the passageways are blocked up with crud and starving the system, or the fluid has lost some of its qualities thru overheating. No it won't make friction material magically reappear on the plates.

    Preventitive maintenance should have been done by the previous owners. We'd only had it for a few monthes at that point and it was on my to-do list.
     
  15. CK82

    CK82 Senior Member
    Messages: 185

    Any idea about how much a rear differential fluid change w/ filter would cost?
    Stupid question, but what does the transfer case do exactly? How often should this be change?

    The front and rears diff's have been changed last year, and I think it had been maintained somewhat well before I purchased it two years ago.I just work my truck pretty hard all year round and like you said would rather be safe than sorry. My front diff. got shredded this year and had to be replaced, not sure what caused it, mechanic said might have been the actuator not engaging.
     
  16. derekbroerse

    derekbroerse 2000 Club Member
    Messages: 2,377

    Differentials don't have a filter. Some have a magnet inside to catch metallic filings, which needs to be wiped off during a fluid change. It is an easy job on a hoist for a mechanic, if it cost more than an hours labour I would be shocked.

    The transfer case is nothing but a gearbox that divides the power between the front and rear wheels. Most use the same oil as the differentials. I'd say do them all at the same time.
     
  17. Yaz

    Yaz PlowSite.com Addict
    from NH
    Messages: 1,061

    Your rear diff in your truck will hold almost 4 quarts, no filter inside. The cover does not have to come off because you have two plugs- drain and fill. fill to just under the fill hole. you'll need a funnel and a long tube. Be careful the old fluid will stink! lol

    The plug has magnet, so just clean it off be fore inserting it back. If you have the Eaton posi, no additive is required. I would go synthetic at around $25-30 bucks at a auto parts store.

    The transfer case takes a few quarts of ATF. Same dreal..drain and re-fill to just under the top hole.

    Whats it do..It transfers the power at the output of the trany back toward the front differential.
     
  18. Yaz

    Yaz PlowSite.com Addict
    from NH
    Messages: 1,061


    Derek you beat me to it.. PS. His truck used ATF in the tranfer case not gear oil.
     
  19. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If he's referring to the '95 and not the '06 in his sig, then it will have to come off to drain it as the 9.5 14 bolts dont have a drain plug. Sure would be convenient if they did though :) .
     
  20. Yaz

    Yaz PlowSite.com Addict
    from NH
    Messages: 1,061


    Opps My bad...You absolutly correct.. I wasn't thinking strait.

    He also would need a a gasket for the cover as well. And the magnet is inside the cover.