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Northstar Engines and System Technical Discussion Discussion, 4T80 experts in Cadillac Engine Technical Discussion; Well i called two tranny shops earlier this week, they both said that the 4t80 cracks at the bellhousing and ...
  1. #1
    cl1986's Avatar
    cl1986 is offline Cadillac Owners Connoisseur
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    4T80 experts

    Well i called two tranny shops earlier this week, they both said that the 4t80 cracks at the bellhousing and is very common.

    and guess what i found on mine?? Is this the normal crack they are talking about?










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  3. #2
    97EldoCoupe is offline Owner of Northstar Performance
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    Re: 4T80 experts

    I've never seen this yet. I'm dealing mostly with the engines, but I've seen enough of these 4T80's. Casting imperfection? Too much stress in the case somewhere?

    I have heard of one local guy having a problem with the case like this in a 2000+ model I believe it was. I'll have to check over my trans collection and see if I find anything. Thanks cl1986 for bringing this to my attention, I'll start checking these units for cracks.

  4. #3
    cl1986's Avatar
    cl1986 is offline Cadillac Owners Connoisseur
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    Re: 4T80 experts

    these two shops i called said this was a known thing for the 4T80's to crack, infact that was the first response from both of them when i told them where it was leaking....

  5. #4
    cl1986's Avatar
    cl1986 is offline Cadillac Owners Connoisseur
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    Re: 4T80 experts

    still dripping......anyone know if there are internals that can be hurt by welding in this area?? Ill find out tomorrow when i pull the pan, but i dont want to have to gut it to do the fix......


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