Is it 'Chunk' or 'Chuck'
There are lots of different terms. Between GM, Mopar, and third party parts catalogs, there is at least three different "technical" terms for the input shaft on your manual gearbox. Ma calls 'em a "pinion." No, I'm not talking about the rear axle.
So "input shaft", "main drive gear", "clutch gear", and "drive pinion," and maybe more
You cannot really make it out, but this diagram of an older GM 3 speed calls it the "clutch gear"
Mopar "pinion":
There are lots of different terms. Between GM, Mopar, and third party parts catalogs, there is at least three different "technical" terms for the input shaft on your manual gearbox. Ma calls 'em a "pinion." No, I'm not talking about the rear axle.
So "input shaft", "main drive gear", "clutch gear", and "drive pinion," and maybe more
You cannot really make it out, but this diagram of an older GM 3 speed calls it the "clutch gear"
Mopar "pinion":