Join Date: Jan 2003
Location: Escondido, California
For the 3-speed automatic and 4.0L engine, 4.10 is appropriate for 33" tires and 4.56 is appropriate for 35" tires.
My TJ had 4.88 gearing and 35" tires when it had its OE 5-speed transmission. I converted it to the 3-speed automatic and its existing 4.88 gearing stayed. That ratio was too low for my 35" tires after installing the 3-speed automatic. I had to stay in the slow lanes because I had to slow down my highway speed to keep the engine rpms reasonable. 4.56 for my 35" tires would have been ideal but I wasn't going to pay again to regear it to 4.56. So 4.56 with 33" tires and the 3-speed automatic would be too low of an axle ratio, that combination would be just like my 4.88 with 35" tires.
Go with 4.10 for 33" tires and your 3-speed automatic, you won't be disappointed or have excessively high or low highway engine rpms.
When you have a choice, buy American made.
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