0 0 1992 Eaton 15040T Rear Differential for a GMC Topkick $1,000 USD (USED) Eaton 15040T Ratio: 5.57 Side Gear Splines: 34 W/ Locker: NO Cast#: N/A Ref# 15687755 ConditionUsedFits To Make(s)GMCFits To Model(s)TOPKICKPart Number15687755Stock Number25835305 MLS Number13726377CategoryDifferentials, Rear Last Updated8/29/2025 LocationSioux Falls, SD, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info