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AOD Transmission     List of Categories

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  1. How much power can a stock AOD transmission take?

  2. What are the gear ratios of the AOD Transmission?

  3. How do I make my AOD TV linkage work with a carburetor?

  4. How do I adjust the TV pressure on an AOD transmission?

  5. Which transmission is better, the AOD or the AODE?

  6. Should I use a lockup torque converter?

  7. Does the AOD have a removable bellhousing?

  8. Which cooler line fitting on the AOD transmission is out and which line is in?

  9. My AOD shifts and works fine 1st through 3rd, but has lost overdrive, what could cause this?

  10. Can I use an AODE valve body in my AOD transmission to make it electronically controlled?






  1. How much power can a stock AOD transmission take?

    The AOD in stock form can really only handle stock power levels. Before planning any engine mods to an AOD equipped vehicle, you should install our AOD Valve Body Kit. Installation of the Valve Body kit will allow this transmission to perform reliably in a 325 to 350 horspower application. If your power goals are higher, you should consider having the transmission rebuilt with heavy duty components from our AOD Performance Products Catalog

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  2. What are the gear ratios of the AOD Transmission?

    1st = 2.40
    2nd = 1.47
    3rd = 1
    4th = .667

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  3. How do I make my AOD TV linkage work with a carburetor?

    You will need a special cable and bracket manufactured by Lokar (865-966-2269).
    Cable: KD2AODHT
    Bracket: SRK4000

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  4. How do I adjust the TV pressure on an AOD transmission?

    See our page on AOD TV Linkage Adjustment.

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  5. Which transmission is better, the AOD or the AODE?

    The AOD was a good transmission in it's day, but the newer AODE and 4R70W have many improvements. The AODE has a thicker, simpler, and much more reliable valve body that is much less likely to warp than the thinner more complex AOD valve body. The AODEs also all came with the 2 inch wide overdrive band and an A (largest Diameter) Overdrive servo. The input shaft is also much stronger on the AODE than the AOD. Lastly, the AODE has a lockup converter clutch rather than a mechanical, gear dependent lockup. What this means is that with the AODE you can have 2nd, 3rd, or 4th gear locked or unlocked. No longer do you have to decide between streetability and performance. You can have your lockup for efficiency, and unlock the converter for better acceleration.

    The 4R70W offers all of the above benefits with the addition of a lower first and second gear ratio to help initial acceleration. Beginning in 1998, the 4R70W also has the Mechanical Diode intermediate one way clutch, and an even better direct input shaft. Certain models also have hardened gears, such as the 1998 and later 5.4 trucks.

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  6. Should I use a lockup torque converter?

    If you do any street driving keep the lockup torque converter. There are not enough, if any, performance benefits to justify the increase in heat buildup, and the decrease in fuel efficiency that eliminating lockup will cause. The lockup feature on these transmissions is not the detriment to performance that many people think it is. At wide open throttle, it may even improve performance to keep the lockup.

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  7. Does the AOD have a removable bellhousing?

    No, the bellhousing for the AOD is integral to the case.

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  8. Which cooler line fitting on the AOD transmission is out and which line is in?

    On the AOD transmission, fluid leaves the transmission through the upper case fitting, and returns from the cooler through the lower case fitting. Please note, this is NOT true for the AODE/4R70W.

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  9. My AOD shifts and works fine 1st through 3rd, but has lost overdrive, what could cause this?

    The two most likely possibilities are an overdrive band problem, or a stuck 3-4 shift valve. If the overdrive band is worn, when the transmission shifts into overdrive it will neutral out and start to rev freely, but not accelerate the vehicle. If the servo that applies the band is stuck or has badly damaged seals the symptoms will be the same.
     
    If the 3-4 shift valve is stuck, then the transmission will not shift into overdrive, but will not neutral out. The transmission will continue to pull in 3rd gear with no slippage.

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  10. Can I use an AODE valve body in my AOD transmission to make it electronically controlled?

    No, the AOD case is different from the AODE or the 4R70W, and the valve bodies will not interchange. If you would like the advatages of the electronic transmission and the Baumannator TCS you will need to change to the AODE or 4R70W Transmission.

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Baumann Electronic Controls, LLC
207 Mistr Lane
Pickens, SC 29671
Phone: 864-335-9365
Fax: 864-335-9055

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Last updated on January 5th, 2008