You can't make those marks without positraction, which was not available on the '64 Buick Skylark.

8 seconds sound clip from the My Cousin Vinny movie soundboard.

You can hear this line at 01:46:41 in the Blu-ray version of the movie.

Quote context

[...]

- It's a fact.

- I find it hard to believe that this kind of information could be ascertained simply by looking at a picture.

- Would you like me to explain?

- I would love to hear this!

- So would I.

- The car that made these two equal-length tire marks had positraction.

- You can't make those marks without positraction, which was not available on the '64 Buick Skylark.

- And why not?

- What is positraction?

- It's a limited slip differential which distributes power equally to both the right and left tires.

- The '64 Skylark had a regular differential, which anyone who's been stuck in the mud in Alabama knows, you step on the gas, one tire spins, the other tire does nothin'.

- That's right. (5)

[...]