Originally Posted by Ratdaddy
I was just told today at 4 wheel parts today that I need 4.56 gears in my 97 4.0 auto running 33s is that right?
Unless your rig is a pure offroad machine, your particular combination needs 4.10 for 33" tires. 4WP isn't taking into account that your automatic only has three gears and no overdrive. 4.56 is appropriate for the 4.0L running 33" tires only with the 5-speed manual transmission that has an overdrive. Unless you will soon be running 35" tires where 4.56 would be a great choice, don't let them talk you into 4.56 for your 33" tires which would cause excessively high highway rpms.