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500, 472, 425, 368 Discussion, 472 will a th700r4 swap directly or...? in Cadillac Engine Technical Discussion; 8000lbs...??? and you are hoping for more than 15 mpg...?...
  1. #16
    albymangled's Avatar
    albymangled is offline Cadillac Owners Fanatic
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    Re: 472 will a th700r4 swap directly or...?

    8000lbs...???

    and you are hoping for more than 15 mpg...?

  2. #17
    ScottConklin's Avatar
    ScottConklin is offline Cadillac Owners Member
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    Re: 472 will a th700r4 swap directly or...?

    What's 8000lbs? More like 5500 or so.(Egads, I missed the Hearse part. Yeah, that might just weigh a full 4 tons).

    Re-gearing into the mid 3's and a well built 700 will get you into the low 20's on the highway(assuming well tuned ignition and free-breathing air intake and exhaust). The factory gears were the compromise to gain highway fuel economy. They kill in town performance though. A gear switch alone is great if you don't plan on much highway use. The car peps right up and so does the fuel economy, but it's usually tough on highway MPG.

    Better is a 4l80E with a controller. It's essentially a Turbo400 with an OD and computer controlled valve body and will take anything the 472 will dish out, bone stock. With an adapter and controller a good used one won't cost you as much as buying and building the 700.

  3. #18
    YourMainParadox is offline Cadillac Owners Fanatic
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    Re: 472 will a th700r4 swap directly or...?

    haha the 4l80e by itself would be over a grand then on top of that the stand alone computer would be 1500+ I don't think I would ever get the gas mpg to make that amount up unless I DD the car

  4. #19
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: 472 will a th700r4 swap directly or...?

    Gas is getting close to $3.00 again, and 92 is over that. Recalculate.

  5. #20
    ScottConklin's Avatar
    ScottConklin is offline Cadillac Owners Member
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    Re: 472 will a th700r4 swap directly or...?

    Used 4l80E: $600 or less. Rebuilt if you carry it in: $800 or less. Controller, las time I looked(was going to put one behind my 500 intended for the M715): $500. Do a mild shift kit yourself. Stall converter...I forget...$275? All told maybe five or 600 more than building a 700 the right way. And you still don't have something as bulletproof as a built 80.

    Drawback to the 80 is carried over from it's TH400 daddy: Parasitic loss. It just takes more to get that mass wound up than it does for the lighter TH350, 700 or especially the 200.

    If making it pay for itself is your goal, give up now. Do you think the guy that trades off his 20mpg paid for sedan for a 35MPG econobox ever makes his money back in fuel savings? If he's lucky he breaks even in the life of the car. Might as well keep the old one and avoid the pymts.

  6. #21
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 472 will a th700r4 swap directly or...?

    I thought Mr Paradox overestimated those prices a little. Since I have never killed a th400 in my life I wouldn't even rebuild any used 4l80e that I bought. I have that much confidence in GM's ability to build a super dependable transmission for the heavy duty applications. I think either swap has it's advantages so I would take the path of least resistance. Whatever deal comes your way first will probably be the easiest.

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