Putting a Mechanical Diode into an AOD...what's needed

98 Camaro

Forum Member
I am going to freshen my AOD and while I'm in there it was recommended to upgrade the sprag to a mechanical diode. I have a few questions.

1.) Will a Mechanical Diode out of 4R70W work?

2.) I heard a need a new drum, but what if I already have the stamped steel drum?

3.) Isn't there a sprag for both Reverse and Direct Drive? If so which one do I need, I'm assuming I need the intermediate diode and not the reverse.
Please help.

3.) What else will I need to complete the conversion.

A conversion kit if offered by a few companies, but its like $300, and my thought is if this is just parts from an AODe or 4R70W that I just need to simply install then I can get those parts for less than $100 used.

Please help.
 
Parts required depend on what year the aod is. Aod's were used up to 1993. In most cases you will need the direct drum, mech diode assy, late (wider) 4th gear band & sun shell/gear.
A 4r70w has basically the same parts, but the planetary are a different ratio, so the sun gear/shell will not work.
 
Thanks Detroit Gearbox (Rich)!

FYI Detroit Gearbox in Warren is a great place to deal with. They gave me great pricing and expert help!
 
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