Alright guys I have to plead ignorance on this. I sort of understand what a shift kit is, but could someone explain it to me. When doing some research for my new 350 engine that I'm getting ready to install, I would read notes like "requires shift kit" or "3000 stall", etc. What the heck does all that mean? I'm wondering if I will need to modify my TH350 tranny when I put in the new engine. Thanks for any help so I can understand this better. Regards, Don