AOD Transmission Oil Pump and Piston Assembly

The AOD (for automatic overdrive) is a four-speed automatic transmission with overdrive. Introduced in 1980, it was Ford’s first four-speed automatic overdrive transmission. The 4R70W stands for 4 gears, Rearwheeldrive, 70 stands for the 4th gear ratio, and Wide gear ratio. It has lower 1st and 2nd gear ratios for better take-off acceleration and improved gearset strength.


The AOD was used originally on ’80s and early-’90s Ford, Lincoln, and Mercury products and in the F-series pickups and E-series vans as well. Because the AOD is basically a retooled C-4, many classic car owners have discovered they can substitute this overdrive transmission into their ’60s and ’70s production vehicles relatively easily and reap the benefits of a lower final gear ratio and decreased wear and tear on their vintage small-block V-8 engine. Theres more parts to take off of this but I will do that when the rebuild kit gets here, just to make sure I get the right parts.

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7 Responses to “AOD Transmission Oil Pump and Piston Assembly”

  1. LanceMetal says:

    awesome video 5 stars

  2. casebutler says:

    i think you just notice the lint more with the red rags 5 *

  3. VicGord says:

    great series enjoying it you are very well versed in those AOD tranny i had one in a 85 t-bird with the 5.0 not a bad tranny all in all i beat the hell out if mine and it was going when it was scrapped.

  4. onyxreddragon says:

    where are you getting your rebuild kits from?

  5. bah53 says:

    Yeah the red ones leave little red fuzz balls everywhere, the blue ones i have are supposed to be “lint free”, so far I haven’t got blue balls yet lol

  6. asilva1818 says:

    what do you clean all the parts with? clean tranny fluid??

  7. bah53 says:

    Use brake cleaner then coat them in new trans fluid so they don’t rust.