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

DionR said

For what it's worth, here are the numbers I worked up when I was looking at an 8HP

	8HP70 w/ 245/45R20	8HP70 w/ 275/35R18
1st	4.69	4.69
2nd	3.13	3.13
3rd	2.1	2.1
4th	1.67	1.67
5th	1.29	1.29
6th	1	1
7th	0.84	0.84
8th	0.67	0.67
Final Drive	3.06	2.71
MPH
20 (1st)​	2245	2229
65 (8th)​	1562	1551
75 (8th)​	1802	1790

So functionally, an 8HP70 with a 2.71 rear gear and a 25.6" tire would feel about the same as a 2015-23 Challenger with the same trans and a 3.06 gear.

Here is the same comparison but with a 235/60R15 and a 3.08 gear:

	8HP70 w/ 245/45R20	8HP70 w/ 235/60R15
1st	4.69	4.69
2nd	3.13	3.13
3rd	2.1	2.1
4th	1.67	1.67
5th	1.29	1.29
6th	1	1
7th	0.84	0.84
8th	0.67	0.67
Final Drive	3.06	3.08
MPH
20 (1st)​	2245	2483
65 (8th)​	1562	1727
75 (8th)​	1802	1993

Click to expand...

I came across this calculator this morning and I like that it has side by side comparisons
Gear Ratio Calculator

I put the 46 on one side and the 8hp on the other. Since 3rd on 46 and 6th on the 8 are 1:1, I can look at those columns and know thats what my 904 will be at...

Talking with a few guys with Hemi swaps and 3 speeds and they like their 3.23 (3.27 Ford). Other future factors to consider tho