Unfortunately getting fresh fluid in there may be a bit late, if it smells burnt.
I just bought a 97 PA with 82 k miles & the first thing I did was do the tranny service!
I am picky with my transmissions, it dont matter what vehicles I own, I drop the pan & filter every 35k miles. Friction modifiers break down and things start to heat up then. I also use LubeGard Red additive. Fluids are cheap tranny'* rebuilds are not.
If it really is not slipping all that bad yet, and you feel that you could get by for a while yet, I would immediately drop the pan see how much clutch material is in there and do the filter. Shop may only charge $100 for it ? The other important factor is to ensure that when hot after driving a while, on level surface in Park you check tranny fluid level.
I ensure mine is never under the full line and often go just slightly above to gain a bit more pressure (sloppy slow into reverse) problem for instance on hill, problem be gone then.
Hope an immediate rebuild can be avoided for now...Drop the pan...