Muleears,
Perfect timing! I'm doing the fluid filter change as soon as my superior shift kit arrives. We have the same tranny--I have an 84 SD.

Which of their springs did you switch out for the K1 & K2?

Thanks,
Jeff

__________________
1984 300SD 300,000 miles--two tank WVO setup
2.88 diff & 500SEL anti-squat rear end