Northstar V8 and 4T80E questions - Page 2
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Northstar Engines and System Technical Discussion Discussion, Northstar V8 and 4T80E questions in Cadillac Engine Technical Discussion; Originally Posted by stoveguyy why did GM put a filter on the 4t65e trans and only a screen on the ...
  1. #16
    Ranger's Avatar
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    Re: Northstar V8 questions

    Quote Originally Posted by stoveguyy View Post
    why did GM put a filter on the 4t65e trans and only a screen on the 4t80e trans? both trans were designed about the same time. maybe by the same department? what type of filter media is in the 4t65e filter? some simple mesh?
    Did you mean 4T65E or 4T60E?

    EDIT:
    Disregard. A little research shows that they are basically the same.

  2. #17
    stoveguyy is offline Cadillac Owners Connoisseur
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    So how easy is that filter to change once trans is out? I can't tell from pic where it is exactly. I assume under side cover? My trans job is done so that filter is not going to be changed anytime soon

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    Re: Northstar V8 questions

    Best I could find is this diagram (hope it works). No parts breakdown, but it appears to be part #010 (upper left), which appears to be in the side cover.
    http://www.makcotransmissionparts.co...-pdf/4T80E.pdf

  4. #19
    stoveguyy is offline Cadillac Owners Connoisseur
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    I swapped my trans and debated on changing some things under side cover but decided no. Heck, I had a good used trans for parts. I may have heard that tcc issues are caused by funky converters. Makes u wonder if replacing the converter with a remaned unit is a good idea when using a used trans?

  5. #20
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    Re: Northstar V8 questions

    Transmission fluid cycles through the torque converter. If the transmission blows up or fails catastrophically, the fluid that was contaminated by the transmission problem will also be in the converter.

    STSClint, Sorry that your thread has been hijacked at post #12. If you wish, we can move the transmission questions elsewhere.

  6. #21
    LittleNo is offline Cadillac Owners Fanatic
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    Re: Northstar V8 and 4T80E questions

    So how easy is that filter to change once trans is out? I can't tell from pic where it is exactly. I assume under side cover? My trans job is done so that filter is not going to be changed anytime soon
    with the transmission out it's easy, just the side cover off and there it is, and side cover with new gasket back on the trans.

    Doing it while the transmission is in the car is much more. I lower the whole subframe with the drivetrain to get access to the side cover. I do it in 2-3 hours, but I understand why they claim 11 in the shop manual.

  7. #22
    LittleNo is offline Cadillac Owners Fanatic
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    Re: Northstar V8 and 4T80E questions

    I found some pictures of the filter I made while doing the head gasket job:

    trans.jpg filter.jpg

  8. #23
    stoveguyy is offline Cadillac Owners Connoisseur
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    Subs illustration had the trans turned on end. So filter appeared vertical. To me anyway. I see the last pic shows it is horizontal and on bottom of pan area. I do cad design and am always turning my parts every which way.

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    Re: Northstar V8 and 4T80E questions

    So that's where that SOB is hiding.

  10. #25
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    Re: Northstar V8 and 4T80E questions

    ........... and that's why the thing is changed at transmission overhaul, not with a simple pan drop. I ripped one apart up at Charlie's Transmission a couple of years ago, from a 4T80E that had dropped the fluid pressure pump first stage and lost 1st gear. The crap in the pan and primary screens looked like the surface of the moon - that filter was clean.

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