87 k10 (v10) transmission problem

[Bladeboy1998]

Helping my buddy out, he's got an 87 k10, it's just a mud truck. It's a frankentruck, I thought it had a th350 in it, but I don't know now. We took it out to a bog and ran it most of the day. When we were done we noticed it was leaking a lot of trans fluid. We towed it home and it looks like it is leaking out of a diaphram on the passenger side, right above where the pan meets the trans housing twards the front of the pan. I am (1) trying t figure out what trans it is, and (2) trying to figure out what this part is so o can get what parts I need to fix it. I will try to upload a picture of the diaphram, but that's all I got for right now. I can get more on saturday.