DFI, Batch Fire, and other myths

[Bruce Plecan]

>The way I know, the crush sleeve is only used to hold the inner bearing
>races against the pinion gear to keep the races from rotating relative to
>the pinion.  It doesn't take any gear loads.  You could remove the crush
>sleeve and loctite the inner races to the pinion.

Ya gotta look close, first off it's helical cut, so the pinion is pushed
away from the ring, when loaded. The rear pinion bearing is a
fulcrum point for the pinion gear climbing the ring.  As the housing
twists, and bends everything in it moves around.
  It can get so bad on say a light 4 cyl car that you add a turbo to,
the the wear pattern can't be duplicated with Prussian Blue, before
disassembly...
Bruce

>
>Gary Derian <gderian at cybergate.net>
>
>>
>>Betcha it was a crush sleeve. The too long driveshaft pounded the
companion
>>flange on the pinion into the sleeve hard enough to smush the sleeve
beyond
>>where it was supposed to be, and the rest was history. No doubt the too
>>long shaft was what got the rear mount bolts too (before you fixed them!
>>
>>The crush sleeves are cheap for the mfgrs to use in a production
>>situation--beyond that they are not worth a #@$% !!!! For any performance
>>application, or even just for a quality rebuild, a conversion to positive
>>pinion preload shims is HIGHLY recommended for ANY rear axle!!!
>>
>>Regards, Greg
>>
>>
>