Intermediate shift shaft P/N 21421 is installed in the upper housing, which sits in bushing P/N 21423. Inspect your old part for excessive play and any physical
damage and replace if necessary. Replaces OEM 23-32632, Sierra 18-3236.
87500 Seal Kits Oil Seals 26-32511A1
P/N 87500 complete upper housing seal kit contains all seals required when re-assembling your upper gear box. Replaces OEM 26-32511A1,
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