so I've decided to rebuild my tired original th350 but a couple hundred miles ago I put a manual valve body in on account that the governor was shot n it wouldn't shift to 3rd when warm. I know, I shoulda just dropped it then but it didn't slip n still doesn't behind 500ft pounds. However when I threw the driveshaft it seemed to lock up. I cranked it a couple times and ended up drive 6 miles home in fwd. Now I know this is a preference thing but if I have the trans built automatic again can't I still shift it manually anyhow? Are there any advantages to a full manual off-road? Or is it just a drag car thing?