Trevor,
No you can't replace pump gasket without taking the tranny out.
I did have duty solenoid A failure in my car. Nothing electrical, just mechanical wear - visually I could see it a bit worn, but nothing totally wrong to suggest that it could not work at all.
The symptom was tranny slippage in 4th lockup when accelerating gently enough to stay in lockup.
Line pressure test shown idle line pressure (60psi) regardless of
throttle position.
I would suggest measuring line pressure first and deciding then.
On one hand a solenoid failure will destroy clutches quickly, on the other hand it is enough $$$ to think before replacing before it broke down.
P.S. Mine has failed at around ~150k (the tranny may have been rebuilt, but not in the last 70k). The car was driven with a failed solenoid for a few weeks at least (but rather gently). Still OK at 161k.
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