Dying 087 3sp AT

[Michael Murphy <mmurphy@nais.com>]

The 89 100 tranny is whining pretty bad above 20mph.  On first (cold)
startup, it won't shift out of 1st for ~1-3 minutes (depends on how cold
it is).  After that shifts are OK. It whines when power is applied.  Let
off the gas and the whine goes away.  This car never got the mineral to
synth diff recall done - but will on Thursday.  I check AT and diff
fluids on a regular basis and there's no leaks or crossover of AT into
the diff.  

Any BTDT or help with reliable parts sources (like rebuilt tranny &
diff) would be appreciated.
TIA,
MJ Murphy