Originally Posted by coswol
yes i know it but if i change only the front diff i change the ratios?
Hi,
You can't change only front ratio (or only rear ratio) : Your central LSD rapidly burn and diff too.
Front and rear ration must be same, EXCEPT if you change in same time the central dispatching ratio between front and rear axles. (2 pinions with chain)
But these pinions are expansive and difficult to find.
Anyway, 3.9 is a very good compromise to obtain good acceleration and good max speed, instead 3.62 or 3.64 stock ratio (2wd or 4wd).
Regards.
Claude