Hi I have a 97 chev blazer 4x4 4.3 also. My tranny was doing great until today. I heard a little noise and then it just started slipping. It would go in 3rd and shift ok unless I hit passing gear then nothing. After I got it home it started going in all forward gears but nothing in reverse. I also checked the tranny oil it was fine. I let you know If I find anything out. If you do let me know thanks. My luck is holding I posted another tranny problem with the 91 eclipse. I also have my sons 85 300zx up on jacks with the 5 speed manual pulled out. It needed the whole pressure plate assembly etc. When it rain it pours.