My tranny is starting to cry and needs to be rebuilt. It is a full time 4 wheel drive. Does anyone have any good ideas as to what is a good replacement?

What are some of your ideas to get more h/p out of my stock 360. It's in my 76 short bed AWD.

last year my truck got a new motor and ran great for a little while. then one day i put it in park ad went into a house for a minute and when i got back it was dead and would not start. 6 hours later i got it to start and back home. it only dies in park, it runs around town fine, but wil not...