break in time
drive a total of 250 miles in 50 mile increments.....after each let it cool down so that they heat treat....after the 250 change the fluid and do it one more time the same way for a total of 500 miles....i did this...and everything is fine
My friend got his done at Ford, they said the same thing....
All it took after that was one 10 mph punchdown and they whined louder than a siren.
I replaced these with a set of Strange gears, drove it easy for 500 miles and these have remained quiet.
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Well I don't have time for that. I installed my motive 4.10's starting at 9am in the morning and at 1pm I drove straight to the track to "break them in"
I put mine up on a jack and run in foward gears for about 15 minutes, and then reverse for 5 minutes. Hit the street and made a few loops up and down the road, then mashed on it! Took it to the track the same night and beat the hell out of em'! No whining so far! 


