2 weeks ago I blew a 3-year-old 700r4 up. I think I broke the planetary gears in it cause every gear besides 1st and made it home. I got another k5 with a rebuilt 700r4 in it but later down the round I found out it was rebuilt in 98. Now I but it into my truck last Friday and last night it started to slip badly and shift hard and then I was at my buddies house. I went inside for about 30 minutes and came back out to drive home. And I started my truck up started driving then it wouldn’t shift out of 1st gear. I kept driving trying to keep the rpms low as possible not to completely destroy the trans and then like 7 minutes later it shifted into 2nd. Then like 2 minutes later it shifted into 3rd and I tried to go home. Now I had to stop at some traffic lights. When I started off I tried to easy it as much as I could but when I gave it any bit of gas it sounded like I heard faint grinding in the tranny. Then like when I was 5 blocks from my house the transmission started to slip badly and I didn’t make it home. I completely lost reverse over drive; drive 2 and 1's. I had to have my buddy drag me home. Now the fluid looked a little black to me and I was going to get it flushed and a new filter in today but didn’t make it that far. Does anyone have any clue what could have caused this? I was in the woods for a little but and it rained earlier that day but I had the dipstick sealed and I don’t believe any water got in there what could water have done this to my tranny for do you think I was ready to go. It didn’t seem 100% when I first put it in but it shifted smooth and seemed to function ok. I had changed like 5 quarts of the fluid from it pouring out when I moved it from my dad’s house to mine.