Quote:
Originally Posted by tomscott
Thanks for all your help !
I do have a 5.5 head on a fairly strong engine.
I do not plan to run an overdrive.
Running a 354 may be a good fit for me.
Thanks. Tom
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Yes, then with what you are saying, a 3.54 will be a good fit. Just understand that this is only about a 7% increase in speed, or about 3½ more mph to your existing speed. That is why a 3.27 is popular because they add about 8 more mph. The improvement happens when you are able to drop your engine RPMs by 7%. A stock R&P with a typical 4.75x19 tire requires about 2600 RPMs to drive around 60 mph. Using a 3.54 ratio allows the RPMs to drop to about 2425 RPMs.