Where would I get an oe oring from for that?

Do a search in your local area for transmission shops/or suppliers. If you can find the supplier you are gold. A trans shop should be able to help as well though.

www.rockauto.com has them for $4.95

What materials should I use as the spacers for my shift kit and is that all extra i need is the spacers?

Here'* a write up on making a shift kit. https://www.gmforum.com/performance-137/making-installing-shift-kit-4t65-hd-transmission-278802/

Update*
changed trans fluid and filter, no chunks of metal but when I cleaned the pan up there was gray pasteish stuff. I went to put the spacers in the accumulator, the spacers that dan'* write up called for were too small. I tried putting it on the rods in the pistons and they wouldn't go on. so i putit back together and reinstalled everything and put the one jug of dexcon in then one quart and the 24oz of lucas stop slip and it still seems to not want to shift into overdrive.

If teh temp sensor in the transmission is bad it wont go in to 4th. The trans needs to be about 75*.

Well ive been driving it around a while today and it still doesnt do anything or are you saying the sensors bad and needs to be changed as well?

You would need to have the car scanned to find out. I'm just saying that is one reason for the trans not to shift in to 4th

I just looked up on another forum and someone with a similar problem got recommended the tps speed sensor and trans temp sensor and what kind of scan because I have the obd1.5 and ive only seen one person who has a scanner that will read it and he is 90ish miles away