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Old 05-25-2009, 02:35 PM   #16
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Originally Posted by Larks View Post
With further inspection, I have noticed that there is a bout .100" movement (100 thousandths) in the front cvd forward/backward direction. This allows the gear mesh on the front diff to fluctuate from approx .050" to .100". Is this normal and acceptable?
That should be ok, but keep in mind if you continue to have issues you should try a looser setting. If you have to shim the Active diff or not, might differ based on new bulkhead or used. Also be sure to use plenty of good high density type grease on those gears. The grease will help reduce heat build-up at the pinion gears.

Quick tip: (DO NOT CLEAN WITH LIQUIDS!) The way this bulkhead is designed it doesn't like wet cleaning in the area of the bulkhead bearings, (No WD40, No O'Donnell spray, no simple green). If you do deep clean, you should change the bulkhead bearings more often.

Last edited by CarCrazy; 05-25-2009 at 03:42 PM.
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Old 05-25-2009, 04:21 PM   #17
JQ
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[QUOTE=Larks;5856641]From what I understand, by reading, and simply engineering intuition, the active diff simply releases off power, and locks on. While on power, it should act as a normal differential and the oil viscosity should affect its 'action' in much the same way as it does the normal. While off power, it should release, somewhat 'freewheeling' and the viscosity of fluid should be of a much lesser affect because at this time the gears should not be engaged. I don't see how running thicker fluid should affect 'what it does' anymore then it does in a normal differential. Although a thicker fluid will require massive shimming, others a little, and perhaps for others, none at all.


You have it confused abit. set up is like in a normal diff, except that the 4 small gears sit in a split casing. Off power it acts like a normal diff, so the oil determines how free it is. ON power, the small gears, which are conical on the outer side, are forced outwards as the diff starts to "work" (one wheel spins faster than other) and as they push outwards the casing halves are pushed outwards and the rub on the ring that is placed around the two bigger diff gears. This creates friction and makes it seem like it has thicker oil in it while on power.
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