Ok this is for you M3,M4 junkies,,,,this is a new rear differential,,,there is a recall on a very small windows of M3 and M4 car,,,,it just a 2 month window,,,,a manufacturer defect.,,,,so we have to replace the whole rear differential. Here some new technical for the rear differential,,,,you notice the two white paint marks,,,,they have to be aligned when putting in the new rear differential,,,,the rear differential and the bitchin carbon fiber driveshaft is all balanced,,,,if you don’t align the paint marks you will damage the rear differential and driveshaft,,,,also that big driveshaft nut,,,,once you tighten it you must let it dry for 3 hour with a special lock tight glue before you drive it. Here’s that Bitchin carbon fiber driveshaft,,,,make sure you don’t scratch it,,,because that will damage the fibers and could cause a big problem down the road. Also notice the big cooling fins to keep it nice and cool while racing on the track.
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