i no some guys with mustangs that get real crapy gas mileage with 4,10s ,i just feel like unless your raceing no need for 4.10,my gas milage is bad as it is ,3,23 or 3.42 will be fine with the stronger gears,couse my existing 28 spline gear i think is getting worn ,not only that it has 105000 miles on it.an some pounding it has took its toll too but still holding up well ,i need to do that strenghtening the 10 bolt sticky for alot less then a 12 bolt ,its hard to drive it like grams car i have heard a few clanks ,but fine the sweet spot seems pretty good for a worn out gu2 mostly from first to second gear when i forget to shift grabs hard wich is good but could break something sooner or later i think

 

Just had car towed to my mechanic car should be back rolling in no time

 

sounds good

 

Keep us posted! If you're doing the 4.10's I know you'll love the difference.