The transmission in my 1991 350SD has begun to have problems after 246,000 miles. It appears to jump out of gear at highway speeds and struggles to shift into high gear from a dead start. Fluid/filter changes have been completed every 30K miles. Does anyone know of a respected transmission mechanic in the Raleigh, NC area? I put the car on a lift and every thing external is fine - no leaks and fluid levels are fine.

Thanks