My 700r4 has developed a regular clicking which is proportional to road speed. It is most audible at low speeds in 3rd- disappears over 40mph.

Any ideas what this might be? It functions OK otherwise. It has a B&M anti - kickdown shift kit installed.

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83 Berlinetta - LG4, Mr Gasket Shorty Headers, Custom Y pipe, 3" pipework, 3" Vortech Muffler, Performer Intake, Open Element, QJet mods. Best 1/4 Et 15.11 @ 90.4 mph, 2.097 60ft.