Okay, so I’ve been getting really into NASCAR lately. Not just watching the races, but like, digging into the nitty-gritty details. And one thing that kept popping up was the transmission. Like, what kind of gearbox can handle all that power and those insane speeds? So, I decided to find out for myself.
My Deep Dive into NASCAR Transmissions
First, I hit up the usual spots – Google, some forums, and a few dedicated racing websites, but the amount of info is so overwhelming, I spent so much time, that’s too complecated for me.

I started simple. I knew NASCARs weren’t running your average street car transmission. No way. These things are built for extreme performance. I figured they had to be manual, because who wants an automatic when you’re pushing 200 mph? And I was right!
My search finally started to clear up, I even found out that they’re built to be super tough. They’re constantly shifting, banging gears, and taking a beating. The gears themselves are straight-cut, which I learned makes them stronger, but also way louder.
And I finally got the name! I found out that, nowadays they are using 5-speed manual transmissions.
So, there you have it. After all my digging and reading, I finally wrapped my head around what transmission NASCAR uses. It’s a 5-speed manual. Mystery solved!