i have been getting a banging noise when i decelerate in gear, that seems to be a lot less when i give the van a bit more gas.  i have no grinding, and no problem at all going between gears.  all shifting is smooth and there is no hesitation at all.  but, as said, a bang bang bang occurs every now and then while in gear.  it is not a constant, as it seems to occur more later in the day after some use than at first start up.
any ideas as to for what i should be looking?   bearing or gear on the way out? oil level low?

help appreciated

don p
84 westy 1.9 MT
carolina, ri

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