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THM425 Transmission parts, repair guidelines, problems, manuals

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Transmission general data

Number of gears	Transmission Type	Drive	ATF (full capacity) L	ATF (change) L	ATF type
3	AT	RWD	12,3	6	Dexron II

The THM425 (and later 325) is a 3-speed automatic gearbox designed and released by GM. The structure of the THM425 is based on the THM400; most spare parts in these gearboxes are directly interchangeable and some others can be adjusted with the help of slight modifications. The THM425 was designed for Oldsmobile Toronado and Cadillac Eldorado.

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Related transmission models or modifications of this transmission:

THM325

Part type

- Accumulator Accumulators, Accumulator Piston, Acummalator Kit, Accumulator Piston Kit
- Accumulator Spring Accumulator Springs, acc spring
- Actuator Actuators
- Adapter Adapter, Adapters, Grommet Valvebody
- ATF / Oil Oils, NS2, NS-2, ATF, Oil
- Band Bands, Brake band, Lining
- Band Strut Strut, Band Struts, Struts, Anchor Pin, Band Anchor
- Bearing Bearings, brg, Mainbearing
- Bellhousing Bellhousings
- Belt Belts, Pushbelt, Pushbelts, Push-belt, Push-belts
- Billet Billets
- Bolt Cover Bolt, Cover Bolts, Mounting Bolt, Mounting Bolts, Pan Bolt, Pan Bolts, stud, studs, Split Pin
- Booster Booster, Boosters, Boost Regulator, Boost Spring, Boost Valve, Lockup Boost, Booster kit, Kit Boost, Kit Boost Valve
- Bracket Brackets, Connector Bracket, Connector Brackets, Cable Bracket
- Breather Vents, Case Vent, Case Vent Valve, Vent Hose Connector, Vent, Plastic Breather
- Bushing Bushings, Bush,
- Carrier Input Carriers, Input Carrier, Carrier Assy, CARRIER-CR, CARRIER-MD,
- Case Casing, casings, cases
- Case Cover Case Covers, Cover, Dust Cover,
- Chain Chains,
- Channel Plate Channel Plates
- Check Ball Check Balls, Checkball, Checkballs, Balls, ball
- Circlip, Snap ring Circlips, Clip, Detent Cable Clip, Line Clip, Linkage Clip, Retainer Clip, Snap Ring, Snap Rings, Retaining Ring, Cover Retaining Ring, Retaining Ring, Circlip Kit, Kit Circlips, Kit Snap Ring, Kit Snap Ring,
- Clutch
- Conductor Plate Conductor Plates, Conducter Plate
- Connector Connectors, loom
- Cooler Coolers, Oil Cooler, Heat Exchange, Heat Exchanger
- Countershaft Countershafts
- Crown Wheel CrownWheel, c/w
- Damper Dampers, Damper Assembly, Damper
- Detent Cable Detent Cables, Kick Down Cable, Cable Kick Down,
- Differential Differentials, Differential Carrier, Differential Carriers, Diff, Diff., Diff Housing Carrier
- Dipstick Dipsticks, dip-stick, dip-sticks, Dip Stick
- Double Clutch Double Wet Clutch, Dual Dry Clutch, Dual Clutch Wet, Dual Wet Clutch, Dual Clutch, Wet Clutch Kit
- Drain Plug Drain Plugs, Drain Bung
- Drive Shaft Seal Right Axle Seal, Seal Left Axle, Left Axle Seal, Seal Right Axle Shaft seal, Seal Drive Shaft, Seal MC Drive Shaft, Seal MC Drive, Axle Seal Left, seal axle, Seal Drive Shaft, Seal 4WD Left Axle, Axle Seal
- Driveplate Flexplates, Flex plate, Driveplate, Drive plate, D/Plate, Flexplate
- Drum Drums, Contender Drum, Drum with Bearing, Reverse Drum, Drum Part
- ECU TCMs, transmission control module, TCU, TCM, Computer, Circuit Board, Control Module, Control Unit, Hardware
- Electrical Electrics, Electric, Electronic, Electronic Shift, Electronics, Pin Wiring, Relay Control Switch, Neutral Relay, Main Relay
- End Plug End Plugs, Tail Plug, Tail Plugs, Tailplug, Tailplugs
- Extension Housing Extn Hsg, Extn.Hsg, Extensions, Extension, Overdrive Housing, TAIL HOUSING, TAIL EXTENSION
- Filter Filters, Filter Cartridges, Filter Cartridge, Oil Pan Filter, Inlet, Filter Kit
- Fitting
- Flange/Yoke Flanges, Drum Flanges, Drum Flange, Flange Yokes, Flange Yoke, Flange Kit, Rear Flange Kit, Yoke, Slip Yoke, Yokes, Flange
- Fluid
- Flywheel Flywheel Shim, Dual Mass Fly Wheel, Fly Wheel, Dual Mass Flywheel
- Friction Friction Discs, Frictions, fric, Friction Disc, Friction, Friction Plate, Friction Ring, fric., Clutch Plate, Friction Lining
- Friction Kit Friction kits, friction pack, friction set, High Energy Clutch Friction Module, Friction clutch
- Front Cover Shields, Shield
- Gasket Gaskets, gsk, gskt, , Cover Gasket, Cover Gaskets, Case Gasket, Case Gaskets, Filter Gasket,Filter Gaskets
- Gasket Pan Gasket Pan, Pan Gaskets, Pan gasket, Filter Gasket,Filter Gaskets
- Gear Set
- Governor Governors
- Ground Sleeve
- Ground Strap Ground Straps
- Harness loom, Harnesses, Line Connector, Wiring, Cover Wiring, Cable, Signal Cable, Cable, Power Cord
- Housing Housings
- Housing plate
- Housing Seal Extension Housing Seal, Ext Housing Seal
- Hub Hubs, Hub Insert
- Impeller Impellers
- Impeller Hub Impeller Hubs
- Inhibitor switch Inhibitor switches, Inhib.Swtch, Range Selector Switch, Selector, Range Switch, Position Switch, Gear Selector, ISM
- Inner Stator Race Inner Stator Races
- Input Shaft Input Shafts, Shaft input, Shaft Input/Main, Inputshaft
- Instruction manual manuals, Technical manual, Repair manual, service manual, Manual, VIDEO & AUDIO, tapes
- Lever / Linkage Lever, Levers, Lever Control Rod, Knob, Lever Pin, Lever Collar, SHIFT LINKAGE, Linkage Rod, Linkage, Park Pawl, Rod
- Lube Lubes, Tranny's Green Assemblee,
- Lube Dam Lube Dams
- Magnet Magnets
- Main Shaft Main Shafts, Mainshaft, Mainshafts, SHAFT MAIN
- Mechatronic
- misc
- Modulator Modulators, Reverse Modulator, Vacuum modulator
- Mount Mounting Pad, Mounting Ring, Transmission Mount, Transmission Mounts, Mounting Rings, Mounting Pads
- Nut Nuts, Hex Nut, Hex Nuts, adjustment nut, band adjustment
- O-Ring o-ring, o ring, 0ring, 0-ring, 0 ring, ORing, Ring, O-Rings, o-ring, O'Ring
- Output Shaft Output Shafts, Carrier Output Shaft, SHAFT OUTPUT
- Overdrive O/D,
- Overhaul Kit ohk, OHK kit, Overhauls, mok, Overhaul kit, Masterkit, Master kit, Master Overhaul, Repair package, Overhaul, Rebuild kit, Master Rebuild, Super Rebuild Bundle, Banner Kit, SUPER KIT, SUPERIOR KIT
- Pan Pans, Crankcase, Oil Pan
- Parts Catalog
- Performance Converter Performance Converters
- Pin Piston Pins, Servo Pin, Piston Pin, Band Pin, Retaining Pin, Retaining Pins
- Pinion Pinions, Pinion Gear, Pinion Pin, Pinion Gear Shaft,
- Pipe Pipes, Modulator Pipe, Inlet Pipe, feed Pipe, oil pipe
- Piston Pistons, Apply Piston, Pack Piston, High Piston, Damper Piston, Piston Damper, Piston Plate, Interm. Servo Pist, Piston Seals, Piston Seal Ring, Piston Seal Rings, Piston Seal, Piston Cover, Piston Covers, Rear Servo, servo piston, Piston Retainer, Piston Retainers, Servo kit, Super Servo, servo, Shift Pison
- Piston Kit Piston Kits, Piston Complete, Piston part, Piston Sets, Piston Set
- Planetary Gear Planetary Gears, Planetary Gear Set, Planetary Gear Sets, Planet, Planetary Assembly, Planetary Component, Reaction Carrier, Planet
- Plug Plugs, Plug Adapter, Intermediate Plugs, Intermediate Plug, Bore Plug, Bore Plugs, Valve Bore Plugs, Valve Bore Plug
- Plunger Plungers, plung, Control Plunger, Control Plungers, Apply Control Plunger, Modulator Plunger
- Pressure Plate Pressure Plates, Apply Plate, Backing Plate, Backing Plates, Backplate, Ret Plate, Dish Plate, Press Plate
- Pressure Sensor Pressure Sensors, Sensor Gov Pressure
- Pressure Switch Pressure Switches
- Pulley Pulleys, Primary Pulley, Primary Unit, Secondary Pulley, Secondary shaft, Secondary Unit, Primary + Secondary Units, (drive)Pulley
- Pump Pumps, Rotor, Vane, Vanes, Kit Pump Vane/Ring
- Regulator Regulators, Main Pressure Regulator, Main Pressure Reg, Pressure Regulator, Forward Regulator, Secondary Regulator, Pressure Reg, Press Reg
- Regulator Valve Regulator Valves
- Repair kit Repair Kit, Kit Case Repair,
- Retainer Retainers, Spring Retainer, Plug Retainer, Bearing Retainer
- Rivet
- Seal Seals, Metal clad seal, Lip Seals, Connector Hole Seal, Lip Seal, Main Seal, Radial Lip Seal, Main Seal, Manual Seal, Oil Feed Seal, Side Cover Seal, Seal Cooler, Seal Oil Cooler, Case Seal
- Seal Pinion Pinion Seals
- Seal Pump Pump seal
- Sealing cap Cap,
- Sealing Ring Seal Rings, Seal Ring, Sealing Rings, Piston Seal, S/Ring, SEALING RINGS S/Ring, Accumalator Seals
- Sensor Sensors
- Separator Plate Seperator Plate, V/B Separater Plate, Seperater Plate, sep plate, Spacer, Spacers
- Service kit Sump modification kit
- Shaft Shafts
- Shell Shells
- Shift Kit Reprogramming Kit, Kit Reprogram, Reprogram Competition, Kit Shift, Kit Auto Shift, Kit Stick Shift, Shift Correction Kit
- Shim Shims, Endplay Shims, End-play Shims, End-play Shim, Endplay Shim
- Sleeve Sleeves, SLEEE, Ground Sleeve, Overlap Control Sleeve, Seal Ring Sleeve, Repair Sleeve, Regulator Sleeve, Modulator Sleeve, Pressure Sleeve, Piston Sleeve, Pinion Repair Sleeve, Damper Sleeve, Bore Sleeve, Boost Sleeve
- Solenoid solenoid, Shift Solenoid, Kickdown Solenoid, Control Solenoid Support, Solenoid Retainer, Interlock Solenoid, Solenoid Switch
- Solenoid Block Solenoid Blocks, sol block, Brass Contact,
- Solenoid EPC EPC, Pressure Solenoid, Pressure Control Solenoid, Pressure Solenoid, PWM solenoid, Pressure Regulator Solenoid
- Solenoid Kit Solenoid package, solenoids, Solenoid Retainer, Solenoid Kit, pack, Solenoid Upgrade Kit, Solenoid Set, Shift Solenoid Upgrade Kit, Shift Solenoid Kit Set
- Solenoid TCC TCC sol, tcc solenoid, TCC Reg, TCC PWM
- Speed Sensor Speed Sensors, Output Sensor, Input sensor, Reluctor, Shaft Sensor, Speed Sender, Sensor Input, Sensor Output, Sensor Input / Output, TURBINE SPEED, INPUT SPEED, VEHICLE SPEED
- Speedometer Speedometer Driven Gear, Speedo
- Split Ring Split Rings
- Sprag spragg, Sprags, Mechanical Diode, Sprag Assembly, Sprag Cartridge, One Way Clutches, One Way Clutch, Roller Clutches, Roller Clutch, Low/Rev Diode, Retaining Plates, Retaining Plate, Accordion Spring, OWC
- Spring Springs, Wave Spring, Spring Adjuster, Spring Disc, Torsion Spring, Return Spring, Piston Spring, Damper Spring, Damper Springs, Control Spring, Detent Spring, Drum Spring, Limit Spring, Return Sprng, Diaphragm Springs, Diaphragm Spring
- Spring Kit
- Stator Stators
- Stator Shaft Stator Shafts, stator support shaft
- Steel Kit Steel Kits, Steel Set Kit, Steel Clutch Plate Kit, Steel kit, clutch steel, clutch steels, Steel set, steel pack, module kit, Steel Plate Clutch Kit, Steel Plate Kit, Steel Plate Module, Steel Plate Set, Steel Module
- Steel Plate Steel Plates, steel, Steels, steel disk
- Stepper motor Stepper motors, steppen, Step Motor, Ratio Control Motor
- Sun Gear Sun Gears, Sungear, Sungears, Sun Gear Retaining Ring, Final Drives, Final Drive, FinalDrive, SUN
- Support Supports, Centre Supp Rebuilt, central support. support central
- Sure Cure Kit Sure, Sure Cure
- Swap Kit
- Switch / Manifold Manifolds, Switch Manifold, Switch Manifolds, Pressure Switch Manifold, Pressure Switch Manifolds, Switch, Manifold
- Switch Valve Switch Valves
- Temperature Sensor Temperature Sensors, Oil Temp. Sensor, TRANSMISSION OIL TEMPERATURE
- Thrust Washer Washer, Washers, T/Washers, Thrust Washers, Selective Washers, Kit Washer, Drive Sprockets, Driven Sprockets, Drive Sprocket, Thrust Kit, Washer kit,
- TOOLS & ACCESORIES Tool kits, Alignments, Alignment, Reamers, Reamer, Tool kit, Tool, Pressure Gauge, Clutch Aligning Tool, Clutch Removal Tool, Clutch Tool Supplement, Kit Installer, Air Test Plate, ADJUSTMENT TOOL, Thread Tap, Remover
- Torque converter converter, t.converter,
- Transfer
- Transfer Bearing Transfer Bearings
- Transfer Seal Transfer Seals
- Tube Tubes, Oil Tube
- Turbine Turbines
- Valve Throttle Valve, Timing Valve, Operating, Relief Valve, Safety Valve, Control Valve, AFL Valve, Limit Valve, Actuator Feed Limit Valve, AFL Valve
- Valve body VB plate, Valve body plates, Valve body plate, ValveBody, V/Body, valve-body, v body, v-body, v/b, Orifice, Hydraulic control unit, HCU
- Valve Kit Overlap Control Valve Kit, Pressure Regulator Valve, Switch Valve Plug, Actuator Feed Limit
- Valve Oversized Oversized Valve, flow control, Oversized Safety, Oversized, Flow Control, Valve pump flow control, Pump flow control valve, Oversized Pump Flow Control
- Valve Screen Valve Screens
- Wear Plate Wear Plates
- Zip Kit Sonnax Zip Kit
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Name	Price
Clutch Kit THM425	$164.00	Show offers
Friction THM425	Inquire for price	Show offers
Friction Kit THM425	Inquire for price	Show offers
Steel Plate THM425	$164.00	Show offers
Overhaul Kit THM425	$48.00 - $135.00	Show offers
Torque converter THM425	$59.00 - $79.00	Show offers
Band THM425	Inquire for price	Show offers
Sprag THM425	Inquire for price	Show offers
Filter THM425	Inquire for price	Show offers
Gasket THM425	$8.00 - $13.00	Show offers
Hub THM425	$164.00	Show offers
Pump THM425	$8.00	Show offers
Housing Seal THM425	$8.00	Show offers
Seal THM425	$8.00	Show offers
Overdrive THM425	Inquire for price	Show offers
Swap Kit THM425	Inquire for price	Show offers
Solenoid EPC THM425	Inquire for price	Show offers
Housing plate THM425	Inquire for price	Show offers
Countershaft THM425	Inquire for price	Show offers
Cooler THM425	Inquire for price	Show offers

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More lightweight gearbox THM325 took the place of the THM425 in both car ranges in late 1978. Since 1979 and later longitudinal engine FWD cars have been equipped with the THM325. The THM325 was upgraded to THM325-4L with an overdrive added in 1982, but all cars with this gearbox switched to more-common transverse engine mounting in 1986.