ATSG GM 4L60E Diagnostic Code Book - General Motors 4L60E Transmission - 4L80E/85E - Diagnostic Code Book Transmission Repair Manual for GM Cars DE-CODE the 4L60E/65E/70E - 4L80E/85E AT's STEP BY STEP Diagnosis DIAGNOSE EVERY transmission code available COVERS YEARS: 1991 - 2007 INDISPENSABLE INFORMATION for any technician or DYI'er