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Transmission fluid check

Discussion in '1st Gen Tundras (2000-2006)' started by 2003stepside, Feb 17, 2020.

  1. Feb 17, 2020 at 1:25 PM
    #1
    2003stepside

    2003stepside [OP] New Member

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    Hi all, just noticed my 2003 Tundra is slinging transmission fluid where driveshaft enters transmission. I am assuming a leaking seal on transmission. Not a bad leak ( does not leak on garage floor) but I am concerned. I looked in owners manual for instructions to check fluid and could not find any. I did find where Toyota states to not change transmission fluid if used under normal driving conditions. Is there a correct way to check transmission fluid level ? If the seal is leaking is this a common problem on the tundra? My tundra is at 144k miles. Anyone know what cost would be to replace seal ?
     
  2. Feb 17, 2020 at 2:10 PM
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    Bubbadog

    Bubbadog New Member

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    Is your truck a V6 or V8?
    Auto or Manual?

    My 2001 V8 automatic Tundra has a dipstick for the transmission. I thought the 2003 V8 autos had one as well. It is on the passenger's side of the engine bay.
     
  3. Feb 17, 2020 at 2:10 PM
    #3
    SoCalPaul

    SoCalPaul New Member

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    I'm pretty sure the 2003 has a A/T dipstick. I don't think the "sealed" transmissions came until 2005. If you have a "sealed" transmission, there should be a second drain plug in a recessed hole on the bottom of the transmission pan. remove that plug & fill from the fill plug until it runs out the recessed plug. The transmission should be at operating temperature for either transmission.
     
  4. Feb 17, 2020 at 2:25 PM
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    PCJ

    PCJ New Member

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    Yes, you're correct. My "04" has a dipstick my son's "05" doesn't.
     
  5. Feb 17, 2020 at 2:50 PM
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    FrenchToasty

    FrenchToasty Desert rat

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    The sealed tranny actually needs to be around 112 degree temp fluid before pulling the check fluid overfill bolt.
     
  6. Feb 17, 2020 at 3:19 PM
    #6
    2003stepside

    2003stepside [OP] New Member

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    It’s the 4.7 v8 with auto transmission. I located the dipstick. What are correct procedure for checking the fluid level ? Engine off or running in park ? Appreciate all the input.
     
    Aerindel likes this.
  7. Feb 17, 2020 at 3:20 PM
    #7
    Aerindel

    Aerindel New Member

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    Check fluid level after truck is fully warmed up, after driving a few miles.

    You check WHILE THE ENGINE IS RUNNING, IN PARK. There is a Hot and Cold range on the dipstick. The cold range is only for reference when refilling a tranny.

    If you need to add fluid, you use a long skinny funnel and do it through the dipstick hole.
     
    school teacher likes this.
  8. Feb 17, 2020 at 3:30 PM
    #8
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Oldie but goodie. Disregard fluid levels on this spec. Just make sure your fluid level hits the hot mark

    upload_2020-2-17_18-29-40.jpg
     
  9. Feb 17, 2020 at 3:44 PM
    #9
    2003stepside

    2003stepside [OP] New Member

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    Got it. That’s what I need. Thanks everyone!!
     
  10. Nov 21, 2020 at 3:09 PM
    #10
    FundraTRD

    FundraTRD New Member

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    Thank you, this post and all the reply’s helped me as well
     
  11. May 6, 2021 at 5:18 PM
    #11
    MS22

    MS22 New Member

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    After your drain and refills have you ever had to add 5 quarts?
    After reading through your posts looks like you changed out your radiator a time or two for prevent maintenance. How can you tell the difference between the original and aftermarket? This is a picture of mine from the top, only markings left on it. Thanks20210506_172927.jpg
     
  12. May 6, 2021 at 5:31 PM
    #12
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Usually, its about 4-4.5 quarts on a drain and refill. I’ll run the engine on a good drive and confirm when HOT and ENGINE RUNNING that the oil hits the top tick or a hair higher.

    A service shop replaced my first radiator with 120k miles. The Stamp on top was the same as the Stealer Programme Denso I just used to replace it except Denso was missing. The service shop used NAPA for everything so it was some Japanese Aftermarket (probably Denso but not Denso).

    The New Denso and the old one had a Raised Embossed Stamp. Not a watermark type like yours.
     
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  13. May 6, 2021 at 5:45 PM
    #13
    MS22

    MS22 New Member

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    Sounds good, It seemed like members were only using 4 quarts so no worries on my part. Looks like Ill be around 4.5 maybe a little more. With 221,000 miles I'm going to assume this is the original radiator so might be time to replace. Thank you :hattip:
     
  14. May 6, 2021 at 5:50 PM
    #14
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Yeah. Main thing is double check the HOT with ENGINE RUNNING Dip Stick Check. Your New Radiator should help the truck run cooler. May want to replace the hoses since you are there. Mine were a little bloaty with 175k. Hose off the backside of the AC Coils when the Rad come out because dirt traps back there between the two units.
     
  15. May 6, 2021 at 6:12 PM
    #15
    MS22

    MS22 New Member

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    The line represents where the fluid is after 8-10 miles of driving after 4 quarts. Looks like Ill have to add another 1/2 and then some.
    20210506_173414.jpg
     

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