I once had a similar problem on a Mustang. Found that problems may have occured a decade before I bought it. The two rear drums were turned to past the limits (still smooth) and the shoes were pooped and hanging up. The wheel cylinder rubbers found new ground and began dripping fluid. It was the fluid creating the surface friction then breaking it upon acceloration that had been causing the troubles.

I did not discover this situation until a rear tire went flat. As a matter of maintenace, I used to brush out the old shoe dust. That is when the problem surfaced after I removed the drum and saw inside the wetness.

Just jack up the car, yank off the drum(s) and then report back here.



Wm.

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Old Ford owner