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i agree that the engines are broken in before we get em, but other things need a tender initiation. The first 500 is the most important for the gears in the rear end, since they are NOT broken in, they just get an initial RUN. Here is a basic break-in procedure ive followed after installing gears in other vehicles: It's info from Randy's Ring & Pinion
Drive 15 min for initial warm up, keeping it under 50, no hard starts.
stop let it cool 15-20 min.
Drive again, under 50 keeping it easy, no hard starts or stops. Taking short cruises to all your friends houses and hot spots is best. during this period, the gears are wearing into each other under load creating their permanent mesh pattern and there is excessive heat generated. That's why you don't wanna just jump on the highway and drive at 65+ for hours on end (as ive read some people plan on doing after they pick up their car) After about 200 miles its ok to drive faster and more distance, but after about 1000 miles its recommended to change the rear end fluid to remove all the metal particles and coating that came of the new gears.
I don't think its bad for the manual transmission either.
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