1) Preparation & safety
- Secure vehicle on lift or level jack stands, disconnect battery, relieve fuel/pressure where needed. Have service manual, correct fluids, torque specs, specialty tools (pump gauge, clutch alignment tool, seal drivers, bearing pullers).
- Why: safe access and the right tools avoid secondary damage and ensure accurate reassembly.

2) Symptom-to-theory diagnosis (do before teardown)
- Slipping under load / low power delivery
- Theory: clutches or bands not developing friction because of worn friction material, burned plates, contaminated fluid, or low hydraulic pressure (worn pump/clearances). Result: engine revs without torque transfer.
- Tests: check fluid color/odor, stall test (automatics) or clutch engagement point (manual), hydraulic line/pressure test.
- Harsh/late/erratic shifts
- Theory: incorrect hydraulic timing/pressure (valve body, solenoids, accumulators), worn clutch/pack, maladapted TCM.
- Tests: scan for codes, monitor shift solenoid currents and line pressure.
- No drive / stuck in gear / pops out of gear
- Theory: mechanical breakage (sun/planet gears, input/output shaft splines, damaged dog teeth, failed synchronizers on manual), or hydraulic failure preventing apply.
- Tests: inspect for debris in pan, pressure test, visual inspection after partial disassembly.
- Drivetrain noise (whine, growl, clunk)
- Theory: bearing wear, pump cavitation (low fluid), gear tooth damage.
- Tests: correlate noise rpm/load; pressure test for pump; inspect bearings/gear sets.
- External leaks
- Theory: failed seals/gaskets, corroded mating surfaces, overfilled or wrong fluid causing pressure spikes.
- Tests: clean area, run to find exact leak source.

3) Removal (order & why)
- Drain fluid. Remove driveshafts/axles, exhaust/heat shields as needed, disconnect electrical connectors, speed sensors, linkage, mount(s), starter and bellhousing bolts, support torque converter/engine as needed, separate transmission from engine.
- Why: proper sequence prevents damage (e.g., supporting engine prevents sagging after removal), and draining reduces spills and weight.

4) Disassembly — inspect as you go (what to look for and why)
- Automatic: remove torque converter, transmission case, valve body, pump, clutch packs, planetaries, bands, servos, bearings, seals.
- Inspect clutch friction thickness, steel plate deformation, piston seals, servo bores, bushings for wear, planetary gear teeth and ring gear engagement, sun gear splines, thrust washers, needle bearings, pump rotor wear and clearances, valve body bore scoring or stuck valves, valve body gasket debris.
- Why: each component’s wear pattern points to root causes (e.g., burnt plates indicate overheating/contaminated fluid; pump wear explains low pressure).
- Manual: remove clutch assembly, flywheel, input shaft, shift forks, synchros, gears, bearings.
- Inspect clutch disc, pressure ring, flywheel surface, pilot bearing, input/output shaft splines, synchronizer rings (brass wear), shift fork tips, gear teeth for pitting/chipping.
- Why: worn synchros produce grinding; damaged splines cause free play and engagement failure.

5) Repairs and theory of how they fix faults (by component)
- Clutch packs (automatic): replace worn friction plates and steels, replace apply piston seals, replace friction retaining springs as needed.
- Fix: restores friction surface and correct pack clearance so hydraulic apply pressure produces torque transfer rather than slip.
- Bands & servos: replace worn lining, rebuild servos/replace seals.
- Fix: restores mechanical hold on drums, enabling correct gear holds and preventing slippage.
- Pump & bushings: replace pump rotor/vanes or entire pump, install new bushings and torque converter pump splines if worn.
- Fix: restores volumetric efficiency and line pressure; higher/steady pressure allows proper clutch apply and shifting.
- Valve body / solenoids / accumulators: clean passages, replace worn valves/solenoids, replace accumulator pistons or springs, recondition bores.
- Fix: hydraulic metering and timing restored; smooth shift timing, no-hunt, correct apply pressures.
- Torque converter: replace or rebuild (clutch, stator, bearings).
- Fix: eliminates shudder, lockup faults, and torque transfer inefficiencies; a healthy lock-up clutch prevents slip at cruise.
- Seals, gaskets, O-rings: replace all external and internal seals, pump gasket, pan gasket, axle seals.
- Fix: stops fluid leaks that cause low fluid/pressure and contamination.
- Planetary/gear sets, bearings, thrust washers: replace damaged gears, worn bearings, and correct thrust clearances using new washers or spacers.
- Fix: restores correct gear mesh and axial play, eliminating noise, gear jump-out, and preventing cross-gear damage.
- Valve body gasket alignment or ream bores if specified: ensure correct hydraulic tolerances.
- Fix: prevents pressure bleed-around and improves apply firmness.
- Manual clutch components: replace disc, pressure plate, pilot and throw-out bearings; resurface or replace flywheel; replace worn syncros or shift forks.
- Fix: restores clamping force, frictional interface and synchronizer ability to match shaft speeds for smooth engagement.
- Replace transmission filter and clean pan/strainer screen.
- Fix: removes debris that causes valve sticking and contaminant-induced wear.

6) Reassembly best practices (and why they matter)
- Use new seals, follow torque sequences/specs, check endplay and clearances with feeler gauges, ensure correct piston stack/pack direction and grouping, pre-fill torque converter with fluid and seat onto pump before mating.
- Why: correct clearances and prefill prevent dry starts, maintain hydraulic pressure, and prevent early failure.

7) Fluid, programming, and adjustment
- Fill with Toyota-specified fluid to correct level and type. For automatics, warm to operating temp and recheck level per procedure (some require running through gears). Clear codes, reset TCM adaptations or perform relearn per service manual.
- Why: correct fluid viscosity and level are mandatory for hydraulic timing and lubrication; TCM adaptation ensures shift maps match new hardware.

8) Testing & verification (how the repair proves itself)
- Static checks: verify no external leaks, linkage range, sensor signals.
- Road test: monitor shift points, pressure (if available), temperature, noise. Re-scan for codes.
- Post-test inspection: re-torque pan/mounts, recheck fluid level.
- Why: observes behavior under load to confirm friction, hydraulic and mechanical repairs corrected the original failure modes.

9) Common symptom -> fix quick reference (concise)
- Slipping under load -> replace clutch packs/steels, check pump pressure.
- Harsh shifts -> clean/replace valve body components, rebuild accumulators, replace solenoids.
- No forward/reverse -> inspect planetary/gears and clutches; replace damaged gearset or clutch set.
- Lock-up shudder -> torque converter clutch or contamination; replace converter or clean/replace fluid and TCC solenoid.
- Grinding shifting (manual) -> replace clutch, resurface flywheel, replace syncros and worn bearings.
- Leak -> replace specific shaft seals, pan gasket, or case mating gasket.

10) Final notes (practical theory reminders)
- Transmission failures are combinations of hydraulic, friction, and mechanical issues; successful repair addresses root cause(s), not just symptoms (e.g., replacing clutch packs without fixing a worn pump will result in repeat slippage).
- Cleanliness and correct clearances are as important as replacing parts — hydraulic circuits depend on micrometer-level fits and contaminant-free fluid.
- Use OEM specs for tolerances, fluid type, and TCM relearn steps to ensure durability.

End.
rteeqp73

TOYOTA LAND CRUISER | Body and Chassis | Toyota This video explains body and chassis as well as user benefits from them. #Toyota #ToyotaGlobal #ToyotaLANDCRUISER Toyota ...

TOYOTA LAND CRUISER | Body and Chassis | Toyota This video explains body and chassis as well as user benefits from them. #Toyota #ToyotaGlobal #ToyotaLANDCRUISER Toyota ...

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