Automotive Trans. The BeginningCommon terms - DefineTerms - DefineSlide 4Fluid’s jobFluid level checksFluid conditionSlide 8ATF typesTrans servicingTrans service tipsAutomotive Trans. Automotive Trans. The BeginningThe BeginningCommon terms - DefineCommon terms - Define•Transmission•Transaxle•Transfer case•Common configurations–Longitudinal vs. transverse–Front vs. mid vs. rear engineTerms - DefineTerms - Define•ATF•Clutch (automatic trans.)•Band•Friction material•Hard part•Slipping•Flex plate vs. flywheelTerms - DefineTerms - Define•Valve body•Overdrive•Gear ratio•Cooler•Upshift•DownshiftFluid’s job Fluid’s job •Lubricate •Cool•Clean•Provide coupling•Control clutch / band engagement•Perform all hydraulic functionsFluid level checksFluid level checks•Typical Procedure–Trans at operating temp.–Vehicle level–Run through ALL gears, vehicle running–Check in ??•Sometimes there will be cold marks•Add line means add one what??•Low fluid usually means ?? Why??Fluid conditionFluid condition•ATF is usually red. Why??•Somewhat dark and brown - old fluid•Very dark or black - burnt•Smells burnt - burnt (duh)•Full of small bubbles - Aerated (low/high fluid or filter leaks)•Feels gritty - Friction material•Black specs - Friction materialFluid conditionFluid condition•Many silvery specs - Hard parts•Milky fluid - Cooler problems•Dipstick black and varnished - ATF overheated / oxidizedATF typesATF types•ATF can be petroleum, synthetic or a combination of the two•Three types of fluid typically used today–1. DexronIII - Mercon–2. Type F–3. ???•Biggest difference is friction modifiers•All brands are certified for miscibilityTrans servicingTrans servicing•Standard interval is ?? miles.•Usually includes pan removal, inspection, gasket and filter change.•Few automatics have drain plugs•Older transmissions also required periodic band adjustments•Always inspect fluid in pan before discardingTrans service tipsTrans service tips•Check new seals on filter for proper fit•Don’t double gasket/seal it•DON’T USE GASKET SEALERS•Pound steel pan mating surface flat •Don’t over torque pan, especially ribbed pans / cork or rubber gaskets (no air)•Stay away from most additives•Quick road test before and after•Triple check fluid