gear break-in time

daivd z

Registered User
i just got some 3.27's installed and the guy that put them in said to wait 500 miles before i go crazy with it. On horse power tv they put some gears in a mustang and said to run it in reverse for like 2 min then run it threw the gears on jack stands then its ready to go. Is the 500 miles necessary?
 
i know new clutches are that way.but never heard rear gear to wait 500 miles.i've had 5 5.0 mustangs and had 3.73 put in all them and never gave them a chance to break in and my 91 sc i had a 3.73 put in 6 months ago and i was getting on it as i pulled out of the dealership's parking lot.never had any gear problems with all 6 cars (with no break in periods).i may be wrong and maybe been lucky 6 times i dunno
 
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