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How do I go about changing out my gears from 3.55 to say 4.10??

which is better for :peelout

And is there any way to make both duals to spend instead of just the right on??
 
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4.10's will be easier to spin, but 3.55's will keep you in reasonable MPG.

If only one side is spinning, you have an open diff, and you'll want to look into getting a limited slip differential.

Swapping gears requires some specialized tools. Unless you have a fair amount of mechanical knowledge and experience, you'll want to leave this to a professional.

You'll need a dial indicator, a pinion depth guage, a torque wrench, a micrometer, and some basic hand tools. You will also need to know the backlash spec, and how to read contact patches on the teeth.
 
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