just got 3.73's!

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12 pack of soda? haha. just take your time, be patient, have a 5# sledge available in case the old pinion wont come out. and dont let people here scare you. its not a hard job, just takes time. be sure to sand the housing and cover off before you re-seal it as well.
 
you need a dial indicator. From my personal experiences set the backlash to .011. I have installed a lot of gears and on fords found this to be best for noise free operation

also record the backlash on the gears your removing for if they are used again by anyone