A note on new gears. I know you want to but don't!

We have been doing a lot of gears lately and what I have been seeing is that some are not giving them time to break in.

This is critical on new gears and even more so on a set of used gears. This is why,
New gears are made and heat treated in a sets. When set up for the first time they need to ware into each other, this in return work hardens the teethes contact pattern. It takes time and to much stress early on can make the gears brittle, damaged from friction or oil break down. That’s why the oil needs to be changed no more then the first 500 miles. Used gears already have a work hardened pattern which we try are best to mach as close as possible. You have to give these time to reestablish there pattern or again the heat from the friction will causes the gears to become brittle.
The rules after a gear install must be followed to preserve their life.

No hard or fast acceleration, compression breaking or down shifting.

Stop after 15-20 minuets of driving and fully let the diff and axle cool before driving again.

No towing before the brake in period.

Light towing, less then 15 miles and letting diff fully cool before continuing for the first 50 towing miles.

No racing, high speeds or off-roading of any sort.

Check torque on wheels after 50 miles and 150 miles.

Pull diff cover after the first 500 miles to change the oil and inspect the gears for sings of ware. Do not just pump the fluid out this leaves metal particles and phosphorus coating from the gears in the diff when you refill it. This contaminates the gear oil and is just about as good as not changing it at all. This will also destroys bearings and seals very fast.

Warrantees of gears are though the manufacture; thus used gear set-ups are not covered. Any heavy use or overloading during the first 500 miles will cause irreparable damage to the gear set that can be determined by inspection of gear set and will not be warranted by the manufacture. If there has been know heavy use or neglect to gears, warrantees will not be tried. We are trying to save you from the heartache and pain from destroying your gears. If it is clear to us that we screwed up beyond a shadow of doubt we will fix it.

I hope this helps, holeski

All warrantees expressed or implied are at the discretion on Holeproof Industries and/or the manufacture of your gear sets. Holeproof Industries is in no way responsible for gear failures of any kind. By buying or having HPI install gears you agree to all terms written or not.