Those Running 3.73 And a TF w/ LockUp.. What's your highway Driving Like?

DionR said
Exactly my point in post #33 in regards to an A8. If your motor won’t work well at the lower cruise RPM’s that the taller rear gear and OD offer, it can make the car worse. And sometimes it isn’t tuning but more just the engine build.

Just have to point out that a 2015+ 6.4/A8 runs at 1560 RPM or so at 65, and sometimes in 4 cylinder mode. And they make 485 HP, so I don’t think it would be considered a “very small cam” motor nor is a Challenger/Charger a light car. And it pulls fine and gets something like 23 mpg.

Not saying it is an apples to apples comparison, but pretty sure the ‘73 Duster I am going to put a 5.7/T56 in will be fine cruising at 1600 RPM just like the ‘15 R/T did before I sold it.

Like I said My engine was built in 1996. There is a huge difference in technologies between then and now. I speaking about my situation, not anyone else's so don't shoot the messenger. If you don't like what I said you don't have to respond negatively. Just keep your negative thoughts to yourself. I thought I was giving thoughtful advice with my life experiences with the OD transmission. It's sad to see that the so called experts can't accept a journeyman's opinion without whining about your expert opinion. From now on don't expect anything from me. You so called experts can do everything. I have been involved in MOPAR's since 1967 and really that's what I love. Maybe you youngsters with your GenIII hemi's need to do a little research on the older engines to see where you came from. I'm in my 70's and don't need a new hemi to toot my whistle.