Do Not Overfill!
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HT4100 4.1, 4.5, 4.9 Discussion, Do Not Overfill! in Cadillac Engine Technical Discussion; ...
  1. #1
    Dave S Texas's Avatar
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    Do Not Overfill!

    Says that on the 440-T4 dipstick. I want to add a 24oz bottle of Lucas elixir to the trans, which is 'on the line' full. Changed filter 40K miles ago, and the fluid looks fine. I am adding the Lucas as a preventive measure since the 100K mile-mark is looming. Adding ¾qt will violate the DNO dipstick law. The trans has no oil-sump so question #1: what the consequences might be by breaking the DNO law? Question #2: my procedure will be.....warm trans, break-loose fluid line to cooler and drain 24oz fluid, add Lucas, drive>seems reasonable,doesn't it? Thanks to any experience Trans man advice.

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  3. #2
    Sevillian273's Avatar
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    Re: Do Not Overfill!

    What do you mean by no oil sump? I have the same trans(440-T4 later renamed to 4T60) and it is most definitely a wet sump system. The danger of overfilling the trans is the risk of the excess bubbling out the dipstick tube and creating a fire hazard. Nothing wrong with unhooking the cooler line and draining some fluid as long as the pump doesnt run dry.

  4. #3
    Dave S Texas's Avatar
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    Re: Do Not Overfill!

    When I say oil-sump, I mean a tank/reservoir to hold excess fluid....like an oil-pan for motor-oil, AC accumulator for refrigeration oil/etc.

  5. #4
    Sevillian273's Avatar
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    Re: Do Not Overfill!

    You dont have a trans pan? Where is the filter located?

  6. #5
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    Re: Do Not Overfill!

    Quote Originally Posted by Sevillian273 View Post
    What do you mean by no oil sump? I have the same trans(440-T4 later renamed to 4T60) and it is most definitely a wet sump system. The danger of overfilling the trans is the risk of the excess bubbling out the dipstick tube and creating a fire hazard. Nothing wrong with unhooking the cooler line and draining some fluid as long as the pump doesnt run dry.
    ^^^This.

    The full line on your dipstick should be right below the level of the bottom of the dipstick tube. Fill it anymore and it will just overflow out the top of the dipstick tube.

  7. #6
    ehall's Avatar
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    Re: Do Not Overfill!

    stick a cheap hand pump down the dip stick tube and pull out a quart

  8. #7
    steelybill is offline Cadillac Owners Enthusiast
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    Re: Do Not Overfill!

    I have a rig called a "top side oil changer" for changing oil on my boat (inboard engine with no drain plug on sump) The thing has a suction pump mounted on the top of it's tank, (about 2 1/2 gallon) to pull oil, or whatever, from just about anywhere. I pull the trans oil almost completely out with it, making it less of a mess.
    If I decide to remove some trans oil for some reason. I can pump some out as needed.
    This rig is handy around a shop, with many uses. and it's around 50 bucks.
    Comes with two hoses, one about 3/8 diameter, and one about 1/4" diameter, and either will fit down in the filler tube. Marine supply stores have them.

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    ehall's Avatar
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    Re: Do Not Overfill!

    I use this $15 hand pump, stick one end down the dipstick and the other end in a coke bottle or milk jug

  10. #9
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    Re: Do Not Overfill!

    ^^^I've been through two of those. They dont last especially when used for gasoline. Pumping oil with the 1/4" tube is a motherf*ucker!

  11. #10
    Dave S Texas's Avatar
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    Re: Do Not Overfill!

    I had one of those pumps. Still have the tubing, but I threw the rest of it away. HF has them on sale for $6, so I'll try again with one. Good idea. At least if it works for me it will keep me from working under the car laying on the concrete. Thanks.

  12. #11
    drewsdeville's Avatar
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    Re: Do Not Overfill!

    Quote Originally Posted by Sevillian273 View Post
    ^^^I've been through two of those. They dont last especially when used for gasoline. Pumping oil with the 1/4" tube is a motherf*ucker!


    Junk for the most part. I personally wouldn't waste the money when it can be as easy as taking a screwdriver, loosening the cooler line clamp and pulling the hose off the cooler.

  13. #12
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    HUF
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    Re: Do Not Overfill!

    How about a turkey buster?

  14. #13
    ehall's Avatar
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    Re: Do Not Overfill!

    Quote Originally Posted by Sevillian273 View Post
    ^^^I've been through two of those. They dont last especially when used for gasoline.
    I wouldn't use them for gas it would destroy the plastic

    Work fine for tranny fluid and such though, I've used the same one for a few years now

  15. #14
    Dave S Texas's Avatar
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    Re: Do Not Overfill!

    Bought one from $5.99 at harbor freight. Worked great. Pulled-out a bottles-worth of trans fluid and poured in the Red Lucas elixir. Used fluid looked pretty good....a little darker Red than new is. Made a 20mi trip to get the Lucas circulated. I cleaned the pump real good, so maybe it will work sometime in the future. I'm happy with the suggestion, thanks to Mr. ehall! Maybe put on CL....someone will prolly buy it for $3

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