Automatic w/OD

[chuzie]

It is not a C4 with OD due to the difference is gear design.

For someone who wants the basic simplicity of an autonomous setup I would go with the AOD and throw 4r70w guts in it just realize you lose the adjustability of the electronic transmission. For a mustang, this is not an issue, for a jacked up bronco, it could be; really depends on the situation. I would not hang my decision to go one way or other other solely on the amount of time spend on the pavement or not. It is more about affordability and simplicity (or lack thereof).

The drawbacks of the AOD:
Small overdrive band susceptible to failure (upgradable with AOD-E or 4R70W internals)
Weak input shaft prone to failure (upgradable)
High TC failure rate (linked to input shaft issues) (upgradable)
Weak TV linkage issues (upgradable)

I misspoke earlier when I said the converters are the same. The AOD-E and 4R70W have variable lockup converters where the AOD has a fixed lockup converter so they are NOT interchangeable.

If you go with the AOD, I suggest you upgrade the above items and go to the TCCOA website and read more about upgrading other items. Most folks do 4R guts in the AOD and I am sure you can do the same.