Spicer Tandem Drive Axles Service Manual J340-S, J380-S, J400-S, W460-S - Manual (Page 13)

IMPORTANT: If any gears are to be replaced, they must be
replaced in sets. Inspect thrust washers for scoring and
excessive wear. Replace all worn or damaged parts.
7. When it is necessary to remove ring gear from differential
case, carefully center punch each rivet head. Use a 9/16"
drill bit on the J model carrier rivets and a 11/16” drill bit
for the W model carrier rivets. Drill through the rivet
heads to a depth as shown through rivet heads. See
Figure 6.
CORRECT PROCEDURE
Case Ring Gear
Ring Gear
Case
INCORRECT PROCEDURE
CAUTION: Always use a soft hammer or H.D. plastic
head hammer to strike punch.
NOTE: Do not use a chisel to remove rivet heads, damage to
differential case may result. See Figure 7.
Differential Disassembly Complete
DIFFERENTIAL DISASSEMBLY
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11
8 . Next, use a round type punch to drive out the remaining
portion of the rivet.