Alright, I've been searching like a mad man in the year since I've had my truck for information on our transmissions. My 05' only had 60k on the odometer when I bought it and had major grind issues in 3rd and 4th no matter how I shift. Some RedLine gear oil helped, but still had problems. I've gotten better at finding a sweet spot in the RPM's to shift at and can usually avoid the notorious 3rd gear grind, though once the car is fully warmed up it's much harder to avoid. I also have the infamous throwout bearing chirp. I've purchased the URD TOB kit and a URD stage 2 clutch and plan to put have these put in and the synchros replaced as soon as school is out (I'm a teacher). Finding parts/information and rebuild kits for our transmissions is a nightmare. I went to my dealer and they gave me a blown up diagram of all the inner gearings of the transmission. They quoted me 150 bucks for the 3rd and 4th gear synchros but I really want to replace all of them while we're in there because 2nd, 5th, and 6th also have occasional problems. I found a rebuild kit that had sold recently on ebay labeled as an RA60 rebuild kit for 05+ 6 speed Tacomas. With all the searching I've done, it appears that the synchro rings in the 2WD and 4WD are the same, the difference in the different rebuild kits is the bearings. Using the photo from this kit, I was able to go to
www.parts.toyotaofdallas.com and look up each of the synchro ring part numbers and ordered them. They were $258 shipped. I'll be taking my truck to a mechanic I've been using for 12 years now. He rebuilt the 5spd in my 93 300ZX about 4 years ago and did a great job. Fingers are crossed that all goes well and I'll update and let you guys know how everything goes.