Zoe Saldana
Senior Member
Correct on both counts!Again, let's not overthink the difference between 3.73 and 4.10 gears. You are only talking the difference of about 170 RPM at 65 mph. That is simply not that much. Sure, the 3.73 should be slightly better freeway MPG....but slightly. City or more stop and go driving can be a wash with the 4.10's possibly being better.
In regards to the older 6 speeds versus the 8 speeds, I don't see how highway mileage would be much different. The ratio of the top 3 gears on both transmissions are basically identical. When you are cruising down the freeway, especially empty, there is no reason you will be in any lower gear, and therefore both transmissions should be equal. The biggest difference with the 8 speed is that 1st gear is way lower, and then you basically have one extra gear in the lower range when accelerating from a stop. So city or stop and go driving should be a little better.
As everything on the internet, what starts out as "option A is slightly better than option B" turns into "option A is the greatest thing on earth and option B is absolutely terrible".
I have a 2500 6.4l with 4.10 - love it!