Sherman A4A2 diesel 2-3 shift problem

[Malcolm Towrie]

Hi,
We have a Sherman A4A2 with the twin 6-71 Detroit diesels. One engine is slow to drop the rpm when the clutch pedal is pushed down and the throttle pedal is released. This makes the 2-3 shift difficult. I've checked the governor for this engine including weights and all seems to be in good condition. The linkage from throttle pedal to governor seems free, but the rear cross shaft bearings just in front of the rads are worn. Only thing I haven't checked is the low speed spring gaps in the governors. Anyone have any suggestions as to what might cause this slow rpm drop with clutch dipped and throttle released?
Thanks,
Malcolm