how much difference between 3.91 and 4.10

mshred said
well i have 3.23's now and i definatly want as much gear as i can without being massive overkill on the highway...i dont drive the highway that much, and usually if i do its for a half an hour at total maximum....however, i do envision wanting to take my scamp to my aunts place in wasaga which is about 1 and half hours away all highway from where i am...does the fourspeed in your dart sport make a difference rpm wise on the highway?

All automatics have some slippage,and it can be better or worse depending on how the stall was built,usually a auto will run a couple hundred more to run the same speed as a manual trans car.There are calculators that can tell you how much slippage you have but you need to have the mph and the corresponding rpm to calculate it,Ive seen as much as 15% on a 12 sec car with a b&m convertor.