Which transmisison do I have?
OD is a fourth gear, now matter which auto has made for that model year. Its most likely an E4OD.
*Direct drive is a third gear function and TC engagement/disengagement is NOT a ratio function.
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Do you have a OD off switch on your gear shifter, if not you will have a AOD. If you do check the number of bolts on the transmission pan, if you have 14 bolts you have the AODE with more bolts you will have the E4OD.

