I notice a minor clunk at about 1300rmp when starting to accelerate. No issues during drive. When coming to a stop another similar clunk while downshifting. Its auto trans with overdrive 4.0 1999.

Anyone experienced this? Major issue?

 

Is it an extended cab? They had a tsb on the driveshaft clunking due to the wrong type of grease I think. How many miles?