My 87 is a slushbox with 205k miles now. I got it 2yrs ago and have changed the fluid, replaced the screen and cleaned the 6 magnets in the bottom of the pan. You can still tell its tired. When going from P to D, it takes a few seconds before it locks and if you gas it before it fully engages, there is slippage. I also notice a little slip from 2-3 under heavy throttle. I'd like to rebuild it...