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Autopapyrus · Daewoo Sens (1st Generation)
https://autopapyrus.com/guides/daewoo/sens/manual-transmission-differential-repair/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Daewoo Sens (1st Generation): Manual Transmission Differential Repair

On the Sens, the differential is built into the manual transmission case and cannot be removed separately. To repair it, you have to remove and disassemble the transmission. Typical symptoms are a hum or whine while driving, clicking and knocking in turns, and oil leaking at the axle outlets. Often it is enough to replace the seals and bearings. If the pinion gears and side gears are worn, replace the differential case as an assembly.

Difficulty: Hard Time: 6-10 hours (including transmission removal and inspection of parts) Steps: 13 Tools: Socket and wrench set, torque wrench, lift or pit, transmission stand or jack, bearing puller, drifts, press or bearing drivers, seal driver, case sealant, drain pan

Part

  • 🔩 Differential repair kit: differential bearings (a pair of tapered roller bearings), right and left axle (drive shaft) seals, case seal or gasket, transmission oil. If needed: differential case (pinion gears, pinion shaft, side gears), final drive ring gear (replaced as a matched set with the pinion). The exact OE part numbers for this transmission are not confirmed, so choose parts by name and by the bearing dimensions after disassembly

Step by step

13 steps
  1. Find the cause before disassembly. An oil leak from under the axles is fixed by replacing the seals, sometimes without removing the transmission. A hum that changes with vehicle speed rather than engine rpm points to the differential bearings or the final drive. Knocking in turns points to the pinion gears and side gears. Rule out worn CV joints and wheel bearings, which cause similar symptoms.
  2. Put the car on a lift or over a pit and disconnect the negative battery terminal. Drain the oil from the transmission.
  3. Remove the engine undertray, if fitted. Disconnect the axles from the transmission: remove the ball joints or control arms and pull the axles out of the splines, without pulling on the CV joint at an angle. Tie the axles up with wire.
  4. Disconnect the clutch cable or linkage, the gear selector linkage, the reverse light switch wires, the speed sensor, the speedometer cable if fitted, and the starter.
  5. Place a stand under the transmission and remove the engine and transmission mounts. Remove the bolts securing the transmission to the engine and lower it. Make sure the input shaft does not hang on the release bearing and clutch disc.
  6. Clean the outside of the transmission. Disassemble the case: remove the covers and the fasteners around the perimeter, then separate the case halves. Before disassembly, note the position of any adjusting shims or rings.
  7. Lift out the differential case together with the ring gear. Check the bearings for play, noise and signs of pitting. Inspect the pinion gears, side gears and shaft for scoring and wear. Check the final drive gear teeth for pitting and chipping.
  8. If needed, press the bearings off with a puller and press the new ones on with a driver on the inner race. Do not strike the cage. Replace the final drive ring gear only as a matched set with the pinion.
  9. Assemble the differential. Use new bolts or thread locker on the ring gear fasteners. Look up the torque for the ring gear bolts and the case in the manufacturer's specifications. For joints like these it is typically several tens of N·m, and you must not guess it by feel.
  10. Install the differential in the case and check the bearing preload and the final drive backlash. It should turn easily with no noticeable play. If the design allows adjustment with shims or nuts, set the clearance to specification.
  11. Apply a thin layer of sealant to the mating surfaces, assemble the case and tighten the bolts in a crisscross pattern. Press in the new axle seals evenly with a driver until they seat fully, and lightly lubricate the lip with oil.
  12. Install the transmission in reverse order. While the transmission is out, check the condition of the release bearing and clutch disc, and replace them if worn. Fill with oil of the correct specification up to the lower edge of the fill hole.
  13. Take a test drive. Listen for hum and check that there are no leaks. After the first 500-1000 km, check the oil level and look for leaks.

Common mistakes and warnings

  • This is a hard job that requires precise adjustment of the final drive and bearings. An adjustment error quickly causes whine and gear failure. Keep the removed transmission on a secure stand, because it is heavy and can fall. If you have no experience disassembling manual transmissions, leave the job to a repair shop. The exact procedure and adjustment specifications for this transmission are not documented in public service materials, so this guide gives only the general principle. Check dimensions and torque values against the manufacturer's specifications.
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