Items marked by the "3T40" tag:

Transmission general data The 3-speed automatic transmission GM 3T40 named as Turbo-Hydramatic 125C was installed on FWD cars with engine capacity from 2 up to 3.1 liters. The first modifications of this transmission did not have the torque converter, later versions (1995) had an electronic control and letter E was added to a new name GM 3T40E. The most significant modification was introduced in 1984. Since then sets of gaskets and seals have not been changed. Number of gearsTransmission TypeDriveTorque (Nm)ATF (full capacity) LATF (change) LATF type3ATFWD2508,53,8Dexron III Technical issues and repair guidelines The GM 3T40 is a reliable, simple transmission that operates over 300 thousand kilometers. It served as a prototype for the 4-speed family 4T40E -4T60E.This transmission rarely gets in repair services. The main spare parts ordered for repair of this transmission are the repair kit of gaskets and seals (Overhaul kit) or a complete Masterkit (with clutches and seals). Which cars run with this gearbox?BrandModelYearTypeEngineBuickCENTURY/CENTURY WAGON95-963 SP FWDL4 2.2LBuickSKYLARK953 SP FWDL4 2.3LChevrolet/GMBERETTA/CORSICA95-963 SP FWDL4 2.2LChevrolet/GMCAVALIER95-013 SP FWDL4 2.2LChevrolet/GMLUMINA953 SP FWDV6 3.1LOldsmobileACHIEVA953 SP FWDL4 2.3LOldsmobileCUTLASS CIERA/CRUISER95-963 SP FWDL4 2.2LOldsmobileSILHOUETTE953 SP FWDV6 3.1LPontiacGRAND AM953 SP FWDL4 2.3LPontiacSUNFIRE95-023 SP FWDL4 2.2LPontiacTRANS SPORT953 SP FWDV6 3.1L How to repair this transmission (Videos)Valvebody Service and SealsDisassembly and InspectionBushing Replacement and Painting Instruction manuals and useful linksLink typeSourceDescriptionpdfshop.ukrtrans.bizManual ATSG 3T40, 125Cpdfshinseiauto.comTransmission breakdown illustration 125Cpdfat-manuals.comDiagnosis and general service 125CwebSonnaxGM 125C Checkball Locations