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Thread: Tranny Questions

  1. #1
    Join Date
    Jul 2003
    Posts
    306

    Tranny Questions

    What are the main differences between a 3.8 L NA AOD tranny and the AOD SC tranny? I assume it has to do with the strength of the input shaft as well as the flywheel. I've set a goal of anywhere from 250-300 hp for my NA AOD. Now what needs to be done? It recently underwent an overhaul about 5,000 km ago. Does this mean that it could be the equivalent to an AODE? I've heard they use the same parts and that when AODs are overhauled, that's how they come out. Once again, thanks to all for your input.

  2. #2
    Join Date
    Jul 2002
    Location
    Coeur d' Alene, Idaho (God's Country)
    Posts
    663
    well An AODE is electronically controlled, and the AOD is not. Also the AODE has a lock up torque converter, while the AOD does not. I believe it's possible to convert the AOD to the newer style lockup converter but it would be expensive...if you just paid for a stock rebuild then i'm sure it has not been done.

  3. #3
    Join Date
    Apr 2002
    Location
    Philly
    Posts
    2,445
    The differences between NA 3.8 AOD and AOD from a SC are the OD Servo is better, clutches, and OD band are stronger. Your tranny is not equivalent to an AODE. The main difference is the AODE is electronically control. As far as converters go the stock AOD's are all lock ups unless you change the converter over to a non lockup. Your converter will lock up in drive and overdrive.

    I would not trust a NA 3.8 AOD behind a motor making 250-300 for too long.
    Later
    Ken
    1992 Thunderbird SC
    13.322 @ 102.81
    1993 Thunderbird SC 5spd..white
    2002 F350 SD Diesel (SC tow vehicle)

  4. #4
    Join Date
    Jul 2003
    Posts
    306

    Lockup?

    What does torque converter lock-up refer to?

  5. #5
    Thats when the converter locks up like when you release the clutch on a manual tranny. The converter locks the tranny input shaft to the engine crankshaft and it no longer slips allowing direct drive of the tranny input shaft from the crank.
    The converter locks in 3rd gear and OD.

  6. #6
    Join Date
    Jul 2003
    Posts
    306

    Coverter

    What kind of converter would help my automatic tranny deal with around 200 hp of punishment? A friend of mine says they can be swapped to allow for more power while improving performance as well.

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