The greatest damage to any
new ring & pinion gearset commonly occurs during the first few hundred miles while the gears are
bedding-in. If driven hard, you will overheat and damage to the gears. This is because
the surface finish of the gears are not perfectly
matched and need some run-time to bed the gears to their match.
Even though the new ring & pinion gears are lapped in they still must have
sufficient run-time to allow the contact pattern to
Over the course of a few hundrd miles the gears will
bed-in, increasing the load bearing surface area which improves the overall durability of the gearset.
It takes much longer than you think for the EVO transfer case gears to bed-in and the longer you can wait before
kicking it's ass the better.
Recommend procedure for breaking-in your
new ring & pinion:
Follow the transfer case
filling instructions provide on the
FAQ section of this
site. Vehicle speeds should stay below 60 mph for the first 100
miles. Drive the vehicle 10-20 miles, stop and let cool for
30 minutes.Do not abuse or dump the clutch
or do any hard acceleration as let the ring & pinion bed-in
gently. If you take it easy on a new ring & pinion and
perform regular oil changes it will last much longer.
Use caution when letting out the clutch as aggressive high rpm clutch dumps can fatigue parts and may
lead to eventual failures.
recently rebuilt transfer cases should have the oil
changed after the initial first 500 and again after 1000
adds a Moly assembly additive to transfer case, do not be
alarmed by the color of the oil. Vehicles that are
being road raced require race car maintenance and all
drivetrain oils should be inspected after each race and
changed if the oil is dark or stinky. Road racing
applications may add an additional 1/2 pint of oil to the
transfer case for added lubrication and cooling.
Transfer case oil recommendations