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Originally Posted by au3xr6
the 5.0 is, compared to the US engines so if you buy an underdrive from the US for a 5.0 it will make no difference.
this is only 1/2 right. as stated above the aussie 5.0 is underdriven compared to the engines used in production in the US so some say it is " factory underdriven"
none of this applies to the 4.0 of course
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The AU/Explorer 5.0L underdriven thing is a myth....the pulley ratios are all within about ~2% of the std E-Series V8.
You can underdrive either with a mix and match of e-series and AU pulleys, but to state the AU 5.0L is "underdriven" compared to US V8's is incorrect.
I believe there are underdrives available for the AU 4.0L, but as stated, if you reduce the size of the crank pulley, you will be underdriving the blower as well.....