All of this is talking about the 12 bolt car differentials. Those are not the same as the 12 bolt truck differential. The truck 12 bolt has only 2 series of carriers, a 3 series and a 4 series
Quote:
Originally Posted by Clyde65
I found this on Mark Williams website.
TIP #12 -- CARRIER CONFUSION: When shopping for 12-bolt differential parts, keep this in mind: Chevrolet generally used three different types of differentials for the 12-bolt -- the two series carrier, the three series carrier and the four series carrier. The "two series" has little use in a hi-po application and should be avoided if at all possible. The three series carrier accepted ring and pinions that ranged from 3.08:1 to 3.73:1 while the four series carrier accepted ring and pinions ranging from 3.90:1 to 6.14:1. While there are a number of subtle variations between the three types of carriers, a major difference is the thickness of the gear flange. Two series carriers are the thinnest while three series flanges are thinner than four series flanges. Because of the size of the flange, the carriers cannot be randomly used with ring and pinion sets from the trio of "families".
It also showed a chart with the thickness' of the flange that the ring gear sits on. I'll measure the 3.73 carrier to make sure it is indeed a 4 series carrier.
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