3 Gaskets NOT always used


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Posted by Paul (in NY) on Sunday, April 03, 2005 at 8:12PM :

In Reply to: how HOT is too HOT???? (rear diff /tranny/transfer) posted by Dave Austin on Sunday, April 03, 2005 at 5:39PM :

Is it possible you have a 1 Gasket Third Member ? Below explains.

Paul

Copied from Army TM-9-808
"The following concept is very important. The axle centerline of the 9-5/8" third member is 1/16" further away from the mounting surface than is the centerline of the 8-3/4" unit to allow for the larger ring gear. Each axle housing after vehicle S/N 82037271 was modified by placing a 1/16" thick ring over the studs and welding it on to space the third member 1/16" out. These housings use only one gasket and have a tag welded on that says "use one differential carrier gasket" (see figure 6-1). On all unmodified housings with a 9-5/8" third member, three gaskets must be used to provide proper spacing.
If a truck exhibits a rear axle breaking off near the outer end, the reason may be that a 9-5/8" third member is mounted in an unmodified housing with only one gasket, serverly stressing the axle shaft by pushing it 1/16" off axis. This is the reason for note c(1) about three gaskets on page 285 of TM 9-808, January, 1944 (3/4-ton WC series trucks). The same condition can also occur by installing an unmodified 8-3/4" thrid member in a 9-5/8" housing, thus stressing the axle shaft by pulling it 1/16" off axis (see paragraphs 5.3 (b) and (c)."



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