Hi: I have a 1973 280 with the six cylinder gas and 4 speed auto trans. It had been sitting for some time, but have it running now. There is a slight delay going into reverse, and it jumps a bit when shifting into the next gear forward. Also, by counting the shifts, it seems to be in 4th, but at 40 or 50 mph it seems to be revving way too high?
Try to flush the gearbox with new fluid. It's cheap and may help :-)
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