I'm getting the new 4.56 gears installed on Thursday; what's the break-in procedure? How easy do I have to be on them for how long?
I think I have to baby them for a couple of hundred miles before I trailer up to Smokey Mnt Nat'l Park for Thanksgiving...
Then again, the FS roads are babying them, right?
Every ,manufacturer is a little different.
I only use Yukon Gears now, and they say:
New Gear Break-In
All new gear sets require a break-in period to prevent overheating damage. Any overloading
or overheating will break down the gear oil, which will cause the ring and pinion to fail.
This can be determined by inspection and will void the gears’ warranty.
Please follow these guidelines to insure proper break-in.
Avoid heavy acceleration during the break-in process.
Drive the vehicle lightly for the first 15 to 20 miles and stop. Let the differential cool
before proceeding.
Avoid heavy acceleration for the first 100 miles.
Drive the vehicle at least 500 miles before towing to retain the gears’ warranty.
When towing for the first time, drive for a very short distances (less than 15 miles) with
the full load and stop. Let the differential cool for about 20 minutes before proceeding.
Repeat this procedure two more times (45 miles total) to fully break in the gears.
Change the oil after the first 500 miles. This will remove any metal particles and phosphoric
coating shed by the gear set during the gears’ break-in period.
These towing instructions may seem unnecessary to most people, but we have seen
many differentials damaged from being loaded before the gear set was fully broken-in.
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