Quote:
Originally Posted by JJchamp48
Out of curiosity, where is the difference in the carrier, is it larger on 4:11 or some other difference?
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The part that the ring gear bolts to is actually called a differential case by GM. This may be causing some confusion if you are looking for parts.
The difference between 3.42-down and 3.73-up is the location of the flange that the ring gear attaches to. As the gear ratio gets numerically higher, the pinion has to get smaller, because the ring gears are all the same diameter. To accommodate this, the flange on the 3.73-up case is closer to the pinion centerline. This is done so the ring gear doesn't get excessively thick and heavy.
The difference in flange location will be quite evident when you have the two cases side by side.
Ray