Honor2afault
Caught the Bug
5.13 for 37's
If you're running 37s try looking at the RPM for 36" tires or even between 36" and 35" tires.
5.38s are not available for a d30 and even on a d44 the pinion will be tiny! As far as the gear ratio itself i think if you have a 3.8 auto you should use 5.38s for 37inch tires and 5.13 for 35inches.Everywhere I've researched showed people running 3.8L switching to 5:38 for 37" tires. Not sure what's everyone thoughts are