Thanks for the quick response Steve! Would you mind checking one more for me? I used to drive a '75 300d - same ratio??

The reason I ask is that the '75 was a much faster, quieter car than the '80. Also it would do all but the very steepest hills at 80+ mph. The 1980 slows down drastically on hills and even on the flat it feels like you want to shift to a higher gear.

As we speak, its with a mechanic having the pump timing checked, a valve adjustment done and the tranny adjusted. I'm hoping this solves the problem - but I'm really curious about the rr ratio difference between the '75 and the '80 - if there is one.

Thanks for your help!