Well the 18+ manual gearing w/ 3.73 is taller than the 2015-2017 w/ 3.31, so it needs the gear.Would be a hoot. Make sure you have a direct connection to a refinery.
Ask the GT350 guys, their 1-2 transmission ratios are close to the 18+ MT82 and some of them have gone 4.09 and 4.56.
With the transmission gear ratios Ford puts in Mustangs now , I would think a 4.56 gear would be great for daily driving.
The rear differential ratio has nothing to do with the driveshaft RPM. Changing the differential ratio affects the half shaft and tire RPM. The driveshaft RPM is determined by engine RPM and transmission ratios. If you're worried about driveshaft RPM you must never go above 50MPH because that would make the driveshaft spin too fast, right, or do you just shift into sixth gear at 20MPH to play it safe with driveshaft imbalance?
The rear differential ratio and tire size determine the road speed at a given engine RPM and transmission gear combination. If you are going 4000RPM in sixth gear with a 27.7" rear tire and a 3.73 or a 4.56 rear differential ratio the speed of the vehicle will differ, not the driveshaft RPM.The driveshaft is directly bolted to the rear differential. Your statement is 100% incorrect.
Unless you're tying to say that the change in gear will need higher engine RPM to maintain the same speed I've lost you. And even so if your shaft isn't balanced enough to take the few hundred RPM change then its already not balanced enough to be driving with.The driveshaft is directly bolted to the rear differential. Your statement is 100% incorrect.
The rear differential ratio and tire size determine the road speed at a given engine RPM and transmission gear combination. If you are going 4000RPM in sixth gear with a 27.7" rear tire and a 3.73 or a 4.56 rear differential ratio the speed of the vehicle will differ, not the driveshaft RPM.
Unless you're tying to say that the change in gear will need higher engine RPM to maintain the same speed I've lost you. And even so if your shaft isn't balanced enough to take the few hundred RPM change then its already not balanced enough to be driving with.