Quote:
Originally Posted by jdstrickland
If you can turn the flange where the shaft bolts to the diff, and the axles do not turn at about 1/4 to 1/3 the rate, then you have a dead differential.
The flange (input shaft) of the diff has the pinion gear on the inside of the diff. The pinion mates to the ring gear, which houses the carrier that the axles fit into. I'm not sure of the gear ratios in the X5, but a typical ratio would be something like 3.45:1 or 4.11:1, which gives you 3.5 or 4 revolutions of the pinion shaft for one rotation of the axle shaft(s). The pinion shaft should have no play in it at all, either moving linearly in and out, or rotationally -- slop in the gears.
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Should you be able to "feel" if there is fluid in the differential? When I was messing with it, it sounded and felt as if there was no fluid in the differential what so ever. Just felt like metal on metal. Would it feel smooth if there where fluid in it? I'm guessing that is why mine went bad. I guess since it is bad (most definitely) I can just pull the drain plug to find out for sure.