Which gears are for me: PRO50 3.73's or 3.90's????

Have a dyno sheet? You can calculate it, but it's complicated.

I'd say the 3.73's would work better with the blower than the 3.90's or 4.10's.

With a blower, you should be thinking 3.55 or 3.73.

And get new Ford gears. There is no reason to use anything different, and the benefits of the Ford gears far far outweigh and few bucks you might save.

Forget about 3.90's, they are completely meaningless unless you are building a bracket racer and your setup happens to call for that precise gearing. Otherwise, there is sooooooooo little difference between a 3.90 gear and either way (3.73 or 4.10). You would have a hard enough time telling the difference between 3.73 and 4.10 in SOTP feel. 3.90's are a red herring.

I don't see a blower in your sig. So I would say the 3.90's, but would also recomned getting new FMS gears for the install reasons.

94-302-vert said:

I don't see a blower in your sig.

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Dan95-5.0 said:

looking for a blower the following year

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BTW, Ford does not make 3.90's.