So the 89 F150 has been slipping. Actually it doesn't even catch 4th gear. I've been trying to get it rebuilt but everyone wants to charge me an arm and a leg.... Around $3000. So I want to see what trannys are compatible with the 5.0 Windsor engine and where I can find a affordable transmission in south Texas.

 

Your options are probably limited to an AOD (what you have now) or a C6 (no overdrive but beefier).

3K is a little steep but it is a big job. Might want to try swapping in one from a local yard first - probably cost you $300-500 + the labor/time to swap it out.

 

What vehicles come with the C6?

 

Lots of Broncos and F series trucks from your generation had them.

Check out car-part.com - punch in your location and search for transmissions in your area.