Kent-Moore J-42385-234 GM Lube Filter DrillKent Moore J 42385 234 GM Lube Filter Drill Application: General Motor All 3000 and 4000 Series Product Families Allison Transmissions Thread Repair Criteria: Prior to beginning the field modification procedure, the filter cover bolt holes must be inspected to assure the M10 Step Drill (J42385231) can properly prepare the hole for thread cutting with the Tap J42385232. If any of the filter cover bolt holes are found oversized the transmission main