Well the problem I have with that is the potential of $1200 bucks and inheriting some one elses problem. Really I would say it gets down to what really up. Remember, I mentioned AAMCO swore up and down that my tranny was falling apart inside and 'he hated to give me the keys because its like giving them to a drunk driver'. The reality is my tranny was clean, just 15 years had made the control springs weak. Simple repair with $80 parts (labor of course more).
Your best bet is spend the effort to find someone trust worthy, and if they get into it and find the internals are shot then mid 2k price for rebuild is reasonable. That usually has 3 ish year warranty. That would be worse case. You might find like me you would need less than $500.