Is there a break-in period for a new rear end?

[jtstang89]

Well, I'm about a week away from getting my 4.10s put in , and I can't wait...but I do have a question about them. After I get them installed, is there a break-in period for them(like a new engine)?...or can I romp on it as soon as I get the car back? I really don't want to hurt the new gears right away...so any input is appreciated. Thanks in advance

 

[SuperStang83]

I was always told to take it easy for 500 miles! Not sure if that is a general consensus or just the guy that installed mine?

Jakob

 

[sublime29]

Taken it easy for awhile makes sense.Maybe 200 mile but not much more.The gears need to mesh together and make there own true.I would take it easy for awhile.You don't have to watch the mileage just take it easy for awhile.When you 1st take it out for a ride get on the highway and go for a nice easy ride and break them in.

 

[Maryland Stang]

According to Precision Gear:

1. Insure that the axle has been filled to the correct level with
proper hypoid lubricant before driving the vehicle.
The oil rating must be GL5 or higher.

2. Bring the axle to normal operating temperature by driving the
vehicle (unloaded) for approximately 15 to 20 miles. Do not
run full throttle accelerations or create any shock loads.

3. Let the axle assembly cool completely.

4. For the next 200 miles of operation, drive gently, without any
heavy loads.

5. If trailer towing is intended, an additional cycle of 200 to 300
miles of break-in is required without the trailer. This is important!
To properly break-in a new gear set, a minimum of 500 miles of
driving is essential before towing.