3.73 and t-lok install in San Diego

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Thanks, the combo comes w/ a bearing kit, hopefully it's all i'll need.
# Front & Reat Pinion Bearing
# Pinion Seal
# Carrier Bearings
# Brush, Gear Marking compound
# Crush sleeve, Pinion nut
# Loctite and cover gasket or rtv
 
The additive is not necessary. Call ford for the right weight but it will be synthedic differential fluid so no additive is necessary. I just put 3.73s is my 05, V6 - huge differance- i used motive gears-no whine. Do you know how to fix the speedometer?