Quote:
Originally Posted by Captainfab
The 3 series carrier has the ring gear flange farther from center than a 4 series carrier.....kind of hard to describe. I don't happen to have one handy to measure. If I can find time tomorrow, I'll see if I can get a measurement and post here. The 3 series carrier will only work with 3.42 gears and higher. The 4 series carrier will only work with 3.73 gears and lower. There are no 3.54 gears for the 12 bolt, just 3.42's. The 3.54 gears are available for the Dana differentials.
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the 3;54 are a dana. gmc used them
ron