Define 'poor highway driving'?? Stick to the back roads?
Seriously though, without any detail on what model car and/or gearbox i can only say if you're after a taller top gear, you can't do too much about it.
There are a couple of aftermarket options for final gears, TRD, quaife? IIRC, both the TRD ratios are shorter... Don't think you've got much choice. And giving it tall gearing would probably make it a dog around town.
Edit: I'm doubling checking my comment about C-series top gear ratios, i'm pretty certain but i'd feel better if i confirm...
Edit2: Well, don't i stand corrected!
And, from memory (somebody else can confirm), the TRD final ratios are 4.7 and 4.9 and fit all C-series.C52 88-91 AE92 4AGE
1st: 3.166
2nd: 1.904
3rd: 1.310
4th: 0.969
5th: 0.815
Final: 4.058
C56
1st: 3.166
2nd: 1.904
3rd: 1.392
4th: 1.031
5th: .815
final drive: 4.312
C160 (6 speed)
1st: 3.166
2nd: 2.050
3rd: 1.481
4th: 1.166
5th: .916
6th: 0.725
final drive: 4.529
E58 (4AGZE)
1st - 3.214
2nd - 2.045
3rd - 1.333
4th - 0.972
5th - 0.820
Final-3.944
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