Governor drive gear is plastic in these trannies and known to
fracture, leaving you with no governor pressure and hence absolutely
no upshift from first (verifty you don't have a stuck kickdown switch
or valve).
This can repaired in car, but you have to make sure there are not
plastic bits in the associated check valve downstream -- otherwise, a
new gear won't fix it.
If it's not that, it's time for a tranny rebuild.
Peter
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