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Old 09-06-2009, 07:17 PM   #3
Parts hoarding partner...
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Join Date: Nov 2007
Location: Toronto
Posts: 3,428
if the wheels spin in the same direction you have posi. when in neutral. keep in mind the reason it is difficult to spin is because it IS IN GEAR you are using arm muscle to work against the gear box, drive shaft and the diff. Lots of resistance will be felt regardless. The hum could be anything -sound also transfers. The most accurate way is either use a long screw driver and put it where you think the noise is coming from. Move the driver to different locations to see if the vibration/sound grows or diminishes. Wherever it is loudest is the source of your problem. Or you can use s stethoscope - gives the same affect but better. Pinion bearing or flange bearing(s) can be the issue.

I think I've had 18 bmw's in 6 years.

1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.
latest addition as of 2013-Gold 87-325is auto! it's a keeper!
KEEPER 88 5sp Vert 2016
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