The easiest and quickest with all bolt in parts would be the Borgwarner 3sp od transmission. Even the driveshaft will work but if an older one the front yoke would need changed. A factory 3sp column or floor shifter would be needed. These trans are cheap and plentiful, usually $125-$250 at swap meets. Be sure the solenoid works as they are pricey but last a long time.
