I have a 3.73 open right now, and my search for a 3.73S is not going well. I have a viscous 3.91S and have found a clutch based 4.10S, which one is a better choice for a fun daily driver? I drive 50% highway and 50% city, averaging 30km of each every day. I'd like to get a 3.73 for mileage but just can't find any. Out of my current options the 3.91 ratio is better than the 4.10 for me but the viscous carrier in the 3.91 is not as good as the clutch pack in the 4.10
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1990 332i, 4 door
2008 KTM 990 Superduke
2018 Golf R, 6spd manual (Pending delivery)
2017 Mazda CX-5 GT
2007 Z4M Coupe - Sold to very nice people -
I have both, S3.91 and S4.10
I must say cruising on the highway is much more comfortable with a 3.91.
As I use the car for joyrides (not much highway), I prefer a 4.10.
But be aware, 140km/h = 4000 rpm with 4.10
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