Hi all,

I've been searching around on these forums for a few weeks, and have found a lot of really great information! I hit a point where either I am using the wrong terms (in my ignorance), or no one has asked yet.

I read that there should be a tag or a stamp somewhere around the valve body cover for the 4T80? Mine doesn't seem to have the tag (like you'd find on a rear differential housing), so not sure if I'm out of luck or if there's any other places that will have the transmissions identifying codes stamped on it? If it's a metal tag, it might have come off when the trans was being rebuilt and it was not put back on.
I know that some components were internalized after a certain year, and knowing that stamp info would help me know my final gear ratio!

The transmission is a core out of an unknown vehicle. Which is okay, because it's going into a project car that's going to require heavy tuning anyway, so not too worried. When this transmission showed up, it came with no sensors or anything. We went to the junkyard to see what parts we might need. We found multiple cars with 4T80s. Here's where the question comes in, some had the part circled in the picture below, some didn't. It goes on the shift selector stalk, and has two wire connectors to it. One place I looked up said this was a neutral safety switch? But this is entirely electronic? Some of the cars in the junkyard had this, others didn't (and given the shifter cables were still on, we assumed they never had one).

If we are using a mechanical neutral safety switch in our gear selector, do we need this circled component? And if we do, any input into how it works would be appreciated. We do have the shop manual, but it hasn't been great on cluing us in on this part. If we don't need it, it will make routing the exhaust much easier to do!



I was going to drop a PM to Adams' Apple, but it looks like he hasn't been active in some years. Again my apologies if this part IS covered somewhere, and I missed it because I was using the wrong term.