3.9s have gone in the diff in my manual eb xr6 but am know just wondering what to do about speedo correction and whts my best bet.

Thanks!!

Work out how much percentage your speedo is reading too high with this calculator

http://www.fordmods.com/forums/documents.php?doc=30

Then get a Jaycar kit and reduce the reading by the same percentage so its reading right again... {DESCRIPTION}

If you need help understanding the corrector, i did a write up about installing one....

http://www.trueblueford.com/discussion/ ... php?t=3187