I did a search for Farmall word in the topic and I found them posted in this forum and also a few in the Farmall vintage tractor forum as well as most other forums like repairs, oil, safety etc
I guess it depends on what you want to say or ask. I just posted a new thread on my leaking stabilizer on my Case tractor and I posted it in the operating forum since I felt that the advice was general and not brand specific.
Welcome to TBN.
By the way, that first message is usually "Hi, I'm attila from west tortila and I drive a Farmall." and it's posted in the 'new member introductions' forum.