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4L80E too full??

Discussion in 'Chevy Trucks' started by Sydenstricker Landscaping, Oct 17, 2007.

  1. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    Okay so I checked my trans fluid after driving it at 50-55 mph for about 10 miles. The trans was at normal operating temps. I decided to check the fluid. It was maybe a 1/4 inch or so above the full mark. Is this bad for the trans?? It shifts fine and all that. Plus the trans is new, has maybe 11K on it now. I considered changing the fluid in it, since it tows a 4500 lb landscape trailer during the week. Figured it would be good to do before winter. Any thoughts?? Should I drain it down some?
     
  2. ABES

    ABES PlowSite.com Addict
    from MN
    Messages: 1,322

    being that its a work truck i would change it every season. you dont want to wait until the fluid is burned then its too late. JMO
     
  3. gcsupraman

    gcsupraman Senior Member
    Messages: 110

    You will be fine - don't panic.! 1/4" is probably only 1/4 to 1/2 of a quart - very small in the big picture.
     
  4. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    You had the fluid up to temp which of course is the best time to check it, but after driving at highway speeds you want to let the truck set for at least 15-20 minutes before you check the fluid level to get an accurate reading. Your reading could have been a little inaccurate from the highway driving. If you check it again with this procedure and it's still overfull, remove some of the fluid or go ahead and do your fluid/filter change. You don't want to run a 4L80E even a little overfull.
     
  5. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    One problem with it over filled. A burp of fluid out of the dipstick tube.
    If it hits the hot exhaust ----> instant fire.
     
  6. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Thats exactly why you dont want them overfull...GM actually had an issue with the 4L60 and 80E's a few years back where they would do just that, due to the breather being pointed to close to the cat. Not good... ATF does have a rather low flash point...
     
  7. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    Thanks guys!!!:waving: I will be doing the trans flush this weekend, hopefully if it isnt raining. The truck wont fit into the garage now with the lightbar on the roof, lol. I dont plan on doing a complete flush, since the trans is so new, how much oil is it going to hold? How much of a PITA is the filter going to be?
     
    Last edited: Oct 18, 2007
  8. Clapper&Company

    Clapper&Company PlowSite Veteran
    from NE OHIO
    Messages: 4,413

    Tom its a cake to do it. What the He----LL Do you know not to over fill LOL
     
  9. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    You'll need 6-7 qts for the drain and refill.

    Changing the filter is easy but when you pull the old filter down, make sure to also remove the O-ring seal out of the case if it isn't still stuck on the filter neck. They dont work too well with 2 seals in there.

    Only add about 4 or 5 qts after you get it back together. Then start the truck and run it through all the gears before adding any more. You want to slowly add more fluid to get it up to the "full cold" mark on the stick. Then bring the trans up to operation temp (Stop and go traffic is perfect for this) before doing a final check and top off. This will prevent you from accidentally overfilling it.
     
  10. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    Cool, thanks B&B!!!:waving:
     
  11. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    They even sell dip sticks that lock into the dip tube so they don't come out.
     
  12. Triple L

    Triple L PlowSite Fanatic
    from Canada
    Messages: 5,988

    Are you just dropping the pan or are you gonna flush the converter and all that good stuff to? I plan on doin this to my truck in a few weeks....
     
  13. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    That's the beauty of the later model trucks (mostly 96-up) they are factory equipped with the locking sticks... and they're also a very good swap idea on the older trucks as well. I use them on the older 400/4L80E equipped trucks that are used off road to keep the dirt and grit from getting in through the dipstick.
     
    Last edited: Oct 19, 2007
  14. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    I am used to the older trucks and the newer cars. My malabo has the cheapest dip stick they could buy installed on it.
     
  15. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    I know what your sayin' Micki :D ;) They don't build them like they used to...
     
  16. mkwl

    mkwl 2000 Club Member
    Messages: 2,361

    Will the stock locking dipstick keep fluid from coming up out of the trans (if it were a little overfull)?
     
  17. murphyslaw

    murphyslaw Senior Member
    Messages: 443

    did u check the fluid while the truck was running? if it was off this will make it read high every time
     
  18. mkwl

    mkwl 2000 Club Member
    Messages: 2,361

    mmm that could be why- check it with the truck running and in park?
     
  19. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    The locking stick will keep it from puking out the dipstick tube if it ever gets hot enough to boil the fluid out of the trans (it can and does happen) but it will still push fluid out the breather in the top of the trans case if it's way overfull..

    Yep..and make sure it's up to temp, on level ground and let it idle for a few minutes to get a good accurate reading...