Hi!
I can't believe you sacrifice so much money for your V8!
I live in Latvia and it so much cheaper to fix cars.
I had my gearbox broke down last year. Actually it was front differential block. I think it ran out of oil. Now I check it every oil change.
So I bought another gearbox (gearbox and front diff are joined together) for 500USD and swapped it. I found out that new gearbox doesn't shift so smoothly. So I decided to take old gearbox and new front part of gearbox.
So basically i replaced gearbox 2 times and labour costed only 600$ !!!
Change of timing belt was about 100$ last month

Cheers.