Does the 8 speed trans have an external spin-on filter? I read an interesting article in either Trailer Life or Motorhome mag written by 2 engineers recomending a filter change within the first 5000 miles. Their position was that significant particulates are in the fluid from the manufacture process and break-in, and removing as much as possible would improve longevity. Complete fluid and filter change would be ideal, but changing just external spin on filter would be helpful. Article also highlighted aftermarket inline filters which would filter smaller particles (measured in microns) and provide increased flow. These I think are used more on big rigs. It sounds like a reasonable step if filter is spin-on type and 1 quart of fluid to install it full.