Issues with my 2001 F-250 7.3L transmission continue...

Consider a Jasper remanufactured unit, that's what I put in mine last year. 3 yr 100k mile warranty, thousands of dealers across the country. Less than the John Wood unit mentioned above but not as bulletproof. Don't risk a used unit, you pay $$$ for labor to remove/install and it's a crapshoot whether it's better than what you have. Jasper dealers are independent auto shops, find a local guy (your guy may already be a Jasper dealer) and get a quote.