4L75 transmission?

[squaredeal91]

Traded a subaru and getting an 83 C10 with a knocking good guys 350 and a replacement engine to go with it so that's cool. He said it has a 4L75 transmission? I know nothing about them. Like barely even heard of one and I felt stupid lol so here I am asking about them. Did a quick Google search and seems there good. Did they come stock in anything?
He said engine and trans came out of a built Vega or something. Pics will come. I was there and didn't get any pics tho. Thanks in advance

 

[NickTransmissions]

Traded a subaru and getting an 83 C10 with a knocking good guys 350 and a replacement engine to go with it so that's cool. He said it has a 4L75 transmission? I know nothing about them. Like barely even heard of one and I felt stupid lol so here I am asking about them. Did a quick Google search and seems there good. Did they come stock in anything?
He said engine and trans came out of a built Vega or something. Pics will come. I was there and didn't get any pics tho. Thanks in advance

The 4L75E is a crate HP 4L60E variant sold over the counter by GM as an alternative to the 4L80E where power levels exceed 600 but where a 4L80E will not fit without modifying the transmission tunnel, which usually not desiresble to do.

To my knowledge, they were never a RPO.