Easy (?) OD Auto Install

JoePole1 said
I have a A518 needing rebuild waiting in the wings for my B-Body. Currently running 904. The idea of a lower first gear and the lighter trans so the 999 has me thinking. Hope I am not hijacking but can anyone comment on the strength of the A999 and what donor vehicle to look for? Assuming they are hydraulic and not electronically controlled.

Edit.....strictly a street car with say 350HP 400TQ ish
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The 999 I have came out of a 88 Chrysler 5th Ave. Hydraulic LU, locks up converter (light throttle) about 40-45mph in my car. Build like a 904 good for your combo. Dont know if or when the LU function changed to electronic? Have the LU converter built as well.