[Formulajones]

Yes, from my experience with various size engines and brands, that's a nice place to be that returns good mileage, less noise, and still enough grunt with any engine to pull any grade without the need to look for another gear.

I like to shoot for 70-ish mph at that rpm range in overdrive. That way on the long trips where speed limits are 75 and I want to cruise 80 I'm still not pushing the engine very hard at 2200 or so, and it still gives me respectable mileage at those speeds.

The problem I have with the new TKX now is they are starting to creep up the OD gear to .68 which is causing me to readjust and rethink the final gear ratio to keep my MPH and RPM where I want it to be. If they are going to do that then I want the 1st gear ratio a little steeper so I can knock some rear gear out of it. They would have been better served to play with the 2-3 gear ratio and leave the overdrive alone. However the .68 overdrive would work well for those that run 3.23 gears like the OP, this trans will fall right in your wheel house. I start to not like it as much with 3.73's or more.

That's one reason that now really has me leaning towards the muscle car trans (McCloud) which is T-5 based with stronger gears and case. I went with a Promotion version of this trans, (good for 600hp) and absolutely love the gear ratios.