Need new set of 2nd gears to my 512Tr gearbox. Does anyone have experience about these gears? Reproduction second gear set for Ferrari 512BB, Testarossa, 512TR - G.T. CAR PARTS INC (gtcp.com)
My guess would be that GTCP are acting as a distributor of www.hcfautoparts.com (who have a very impressive website showing their gear manufacturing capabilities). Don't know that for sure, or if you can buy from HCF directly, but they'd be on my list of suppliers to check with for any F gear/shaft.
Sorry I am late to this post. OP, I have that gear set in my car. Easy to install and high quality. No noise, 2500 miles so far and running well. I would recommend doing both 1st and 2nd while you are in there, both are prone to issues and this solves both. Hope that helps. GT Car Parts even helped me a little on cost because I bought both.