Okay I have a 87 s-10 blazer with a 2.8 when I got it slipped in reverse then one day the tyranny popped when I put it reverse and now. It slips in over drive and. Not reverse but I was told to put a shift kit in it and it fixed it for 10 mins and then it started slipping again does anyone have a idea what I need to do

 

I can barely understand your message, but from what I do understand your trans is slipping.

If so, I would start by checking the levels. If the fluid level is fine, or if there is any burnt smell from the fluid... you most likely need to rebuild the trans.

 

+1, you can try some lucas but its more of a bandaid.