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Author: Subject: What diff Ratio?
Shooter63

posted on 18/9/16 at 09:19 PM Reply With Quote
What diff Ratio?

At the moment my car is running a 3.9 diff with 185/60-14 wheels/tyres, with the type 9 5th gear ratio this allows me to cruise quite nicely at around 80-85mph without the engine revving it's nuts off.
My new tyres/wheels will be 195/50-13, obviously the revs are going to be quite a lot higher for the same speed, do you guys think it will be worth changing to a 3.54 diff ratio or will this kill the acceleration

Shooter

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snapper

posted on 18/9/16 at 09:40 PM Reply With Quote
If your running a 3.9 I assume from this its a Sierra diff therefore your next higher option is a 3.6 (3.54 is a live axle ratio).
There are some great gear ratio calculators that let you try different wheel/tyre/gear ratios
Much better than guessing





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richard munnis

posted on 18/9/16 at 09:53 PM Reply With Quote
Look up the Westfield speed calculator and just put in diff ratio tyre size gear ratios and it works it all out for you
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Shooter63

posted on 19/9/16 at 06:35 AM Reply With Quote
quote:
Originally posted by richard munnis
Look up the Westfield speed calculator and just put in diff ratio tyre size gear ratios and it works it all out for you


Thanks for that, it seems the 3.54 diff will work perfectly.

Shooter

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