My 83 300D sat for about 10 day's while we were on vacation. When I drove home from N.O. LA. I noticed a vibration when slowing down and accelerating beween 30 to 45 mph.This lasted for about 10 miles and gradually disappeard the further I drove. By time I got to B.R. LA. it was gone entirely. Could I have one or both flex couplings going bad? Thnks for your help.

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Keith Schuster
99 Harley Davidson Ultra Classic
97 Dodge Ram
83 300D
Heavy equipment\hydraulic mechanic 20 yrs