swapping transmissions while swapping motors???

[draggin49]

Well, just got some bad news , the original motor in my truck has significant damage, so I will be replacing it.

Would it be worth swapping transmissions too while im at it?? I personally am not a fan of 3 on the tree manual, and the truck came with the lowest gear ratio offered so I was thinking overdrive might make it far more practical due to the fact I have to get on the freeway to get to surrounding cities on a regular basis.

How difficult is it to put an overdrive automatic in place of the stock manual tranny??
What items must be done to make it work??

I will be keeping it small block powered, so maybe I can find a used motor/trans combo
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