AOD vs FMX
- Thread starter jmerson
- Start date
Ardun
Senior Member
On the AOD, pay close attention to the rear end gear ratio. With a 3:70 or lower, the 1-2-3 shift occurrs way too soon and downshift not soon enough causing engine bog. I used a Transgo Hi Rev shift kit to correct the problem as best as possible. Do some research or you may be disappointed. A higher ratio would eliminate this also.
I have an FMX in my 34 and like it. Have an AOD in my 53 with a 3:90 rear end and am happy since I put the kit in. I don't recall the size difference.
Tom
I have an FMX in my 34 and like it. Have an AOD in my 53 with a 3:90 rear end and am happy since I put the kit in. I don't recall the size difference.
Tom
Last edited:
rotorwrench
Well-known member
The FMX was the very pinnacle of the evolution on the Borg Warner designs beginning with the first Ford/Merc-O-Matics in 1950. The AOD surpasses it by a good bit but you do have to find out which one will work the best for your application and how to make all the features work correctly. Some of them are larger.