If its time to change your Allison internal sump filter on your Duramax, consider purchasing this combo filter and lock kit from DHD.
DHD 100-250 Billet Aluminum Filter Lock
Trans Star 121010 Shallow Sump Filter (Replaces GM 29537965)
2001-2010 Allison LCT 1000 w/Factory Shallow Pan
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California Residents: Prop 65 Warning
WARNING: Cancer and Reproductive Harm