I HAVE A 1985 E350 MOTORHOME AND AM LOOKING FOR ANYTHING THAT WILL HELP MPG I HAVE A 52 AXLE CODE AND FROM WHAT I CAN READ AND TELL IT IS 4.11 . AT 55 IT IS TURNING OVER PRETTY FAST AND WILL PULL A HOUSE DOWN , THE STATE OF TUNE SEEMS PRETTY GOOD AND I AM WONDERING IF CHANGING TO 3.73 WILL HELP ME IN MY QUEST FOR ADDED ECONONY , ANY HELP WOULD BE APPRICIATED GREATLY,

THANKS

 

My '87 E350 Diesel motorhome has 3.54 gears, and does fine, and cruises nice and 55-60.

It is abit sluggish off the line though.