I have a 94 z28, 6 speed car with the factory 3.42 and am looking at replacing it with a 4.11 to drive on the street. How do these perform and is it too much or does the 6 speed have enough of an "overdrive" to make it feasible? Thanks

 

there are a few guys on here with 6 sp 411 setup. should be about 2500 rpms at 65mph

 

Since these are ratio is it easy to see your change in RPM.

3.42/4.11=1.202

So at any point you can take your current RPM time 1.202

 

Its going to hurt your MPG a good bit running 4.10s or 4.11s. Posting your mods in your sig might help us point you the right way. Thats a big jump in gear if its a Daily Driver.