Going from a 3.43 to a 3.73 is usually not worth the hassle and expense. The difference is, mathematically, less then 10%. Under all but the most extreme towing circumstances you probably won't even notice the difference. If you feel that a re-gear is necessary it might be better to go to a 4.10 instead. At least that you'd notice.camping479 said:I had a price of 1500 to just change the rear in my truck. I've got a 3.42 and would like to move up to a 3.73.