1) Symptoms & diagnosis (why you decide to replace the planetary set)
- Typical symptoms: whining or chattering from the trans, harsh or slipping shifts, burning smell, metal particles in fluid, loss of drive in certain ranges, or specific ratio failures (e.g., no 1st or 2nd).
- Confirm: check fluid condition (metal shavings, burnt smell), magnetic drain plug, road test to map which ratios fail, and hydraulic pressure tests to rule out valve body or clutch pack faults.
- Theory: planetary gears create the different gear ratios by coupling sun, planet carrier and ring in different ways. Damage to teeth, bearings, thrust washers or excessive endplay breaks proper tooth contact and load distribution, producing noise, loss of drive or slip.

2) Preparations & safety
- Tools, jackstands/transmission jack, manual for factory torque/clearances, dial indicator, plastigauge or endplay gauges, micrometer, bearing pullers, press, new bearings/seals/shims/planet set, clean workspace. Disconnect battery; support engine and transmission properly.
- Theory: correct tooling and supporting loads prevents distortion of housings and damage to precision gear clearances during removal/installation.

3) Remove transmission (high level)
- Drain fluid. Remove driveline, converter/torque converter bolts, bellhousing bolts and supports, linkage and electrical connectors, then drop transmission per factory procedure.
- Theory: accessing the planetary assembly requires separating the case and often removing the torque converter/input assembly. Do not pry or force parts that index bearing races.

4) Disassembly to planetary pack
- Remove front cover/input shaft assembly and oil pump as needed. Remove valve body and any securing plates to access the gear train. Split the case halves per manual.
- Mark orientation of parts and note shims. Keep parts organized by stack order.
- Theory: planetary groups are retained by carrier bolts, snap rings, thrust washers and bearings; careful order retention is critical because backlash and endplay are set by those exact component thicknesses.

5) Inspect & measure components
- Inspect sun gear, planet gears and pins, ring gear, carrier, bearings, bushings, thrust washers for pitting, chipped teeth, scored journals, overheating discoloration, and excessive wear. Check bearing plays. Use micrometer to measure gear dimensions and side clearances.
- Theory: tooth damage changes contact pattern and reduces tooth surface area for load sharing. Worn bushings and bearings increase endplay/backlash and allow misalignment; both cause noise and accelerated wear.

6) Decide repair vs. replace
- Replace the entire planetary set if teeth are damaged or if bearings/bushings are beyond spec. Replace individual bearings/bushings only if teeth and carriers are within spec. Always replace thrust washers if worn. Use only correct OEM or matched replacement sets.
- Theory: matched tooth geometry and correct bearings are required to restore original load paths and clearances.

7) Remove defective planetary pack
- Remove retaining bolts/snap rings and extract planet carrier, planets, sun and ring gear per sequence in the manual. Remove bearings and bushings with a press or puller. Clean all mating surfaces.
- Theory: extracting without damaging race faces preserves sealing and reference surfaces for correct preload.

8) Prepare replacement parts & check fitment
- Press new bearings, install new bushings, check shaft fits and clearances, clean bores. Replace any worn carrier or ring gear if necessary. Check that replacement gears engage cleanly without binding.
- Theory: bearings and bushings position the planets and set alignment; correct fits restore geometry and concentricity of the gear train.

9) Reassemble planetary pack with correct shims and washers (critical)
- Install planet shafts/pins, planets, thrust washers and carrier. Reinstall sun gear and ring gear. Use correct new thrust washers/shims where required; record and replace shim stacks exactly or adjust by measured amount.
- Measure backlash between sun/planet/ring teeth with a dial indicator. Adjust shims to obtain factory backlash spec. Measure planetary carrier endplay and adjust using correct shim thickness/plastic gauge if required.
- Theory: backlash controls tooth engagement; too tight = binding/heat/rapid wear, too loose = impact loading, noise, and gear tooth fatigue. Endplay and preload control axial runout and bearing loads. Correct shimning restores tooth contact pattern and balanced load across planets.

10) Torque and preload
- Torque carrier and retaining fasteners to factory specs. Set bearing preload where applicable (some setups use crush or preloaded bearings). Re-measure backlash and endplay after torquing.
- Theory: final torque changes bearing seating and can change backlash; verifying after torquing ensures the theoretical settings translate to real assembled condition.

11) Reassemble transmission
- Reassemble case halves, reinstall pump/input, valve body and covers following factory sequence and clean surfaces. Replace all gaskets and seals. Reinstall torque converter, mount transmission to engine, reconnect linkages and electricals. Refill with the specified ATF and correct level.
- Theory: cleanliness and correct sealing ensure pressure integrity. Pump and valve body must be free of debris; contamination from a failed planetary set (metal) must be removed to protect clutches and valves.

12) Functional checks and break-in
- Before final road test: perform static hydraulic pressure checks, stall tests if applicable, and run the trans through all ranges on a lift to confirm engagement and no noises. Monitor for leaks. Then road test, watch fluid temps, and repeat checks.
- Theory: hydraulic pressures confirm the valve body and pump are functioning; initial break-in lets new surfaces mate under load and exposes any remaining issues.

How the repair fixes the fault (summary)
- Replacing damaged gears/bearings/thrusts restores correct tooth geometry, concentricity and load-sharing among the planets.
- Correct shims and preload restore backlash and axial clearance so teeth engage smoothly, avoiding impact loads and heat build-up.
- New bearings/bushings eliminate play that caused noise or misalignment.
- Cleaning out metal and refreshing seals prevents contamination-driven failure of clutches and valves.
- Result: restored mechanical ratios, elimination of noise, proper torque transfer, correct hydraulic behaviour and reliable shifts.

Key practical notes (short)
- Always use factory specs for clearances and torques.
- Replace bearings, thrust washers, and seals during planetary work — they’re cheap compared to repeat failure.
- Inspect pump, valve body and clutches for contamination; replace fluid and filter.
- Measure twice: backlash and endplay are the controlling geometry — get them right.

No further commentary.
rteeqp73

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