Originally posted by Duke2.6
...The biggest reason to change gear ratio IMO is to reduce engine noise at freeway cruising speed, but with a V8 the difference will not be that much.
Thanks for all your help!
The high revving to attain high speeds is the main drawback of my benz.
I did some math and by installing the 2.47 differential, i will be able to do 60mph at around 2200rpm.
Both of the previous cars (Volvo, Mazda) i've owned, used to do 60mph at around the same rpm.
As i said before, i am willing to sacrifice some of the acceleration for fuel economy and longevity.
Could anyone with a late 70s 450SL / SLC tell me at what rpms they do 60mph (at the highest gear)?