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I bought a 2006 2wd Titan KC with a 15'' full throttle suspension lift and 3'' body lift with 40x15.50 toyos.

I recently bought some 49'' super swamper iroks to replace the 40s. after talking to some friends im concerned about my gear ratio and my axles, since i bought it already lifted im not sure if they were upgraded and if not should they be, to support the extra rotating mass that the 49s are gonna have?

I dont have a lot of knowledge with vehicles so any suggestions on what i can do to support the 49s is greatly appreciated!!!
 

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If you already had 40's, and the guy put that much money into lift and tires, i wouldn't have a doubt in my mind he regeared it, most likely 4.56's, and with 49" tires, i would regear it, not a must, but i would recommend it imo.
 

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Take it to a shop? I dont know much about gearing etc, so i wouldn't know how to DIY it. Hope someone else can shine some light on this.
 

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Record your RPM at 60 mph and do the 4th grade math.

2.94 OEM gears on OEM tires = 1500 rpm @ 60 mph

3.36 OEM gears on OEM tires = 1750 rpm @ 60 mph
 

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Did they give it to you as long as you would fuel it lol?
 
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