Diagnosis of signs of malfunctions of a mechanical transmission (Chevrolet Captiva 1 2006-2018: Transmission: Manual gearbox

Complaint/Condition	Possible reason	Remedy
Knocking at low speeds	Deterioration of the drive axle connection.	Check drive axle connection and replace if necessary.
Knocking at low speeds	Wear on the inner diameter of the side gear or pinion gear.	Check differential housing and replace if necessary.
Increased noise when turning	Differential gear wear.	Check differential gears and replace if necessary.
A thumping sound when accelerating or decelerating	Loose engine mount.	Check engine mounts and tighten if necessary.
	Deterioration of the internal connection of the drive axle.	Check drive axle internal connection and replace if necessary.
	Worn differential gear shaft.	Check differential gear shaft and replace if necessary.
	Wear of the bore of the side gear hub.	Check the side gear hub bore and replace if necessary.
Clicking when turning	Wear of the outer constant velocity joint of the drive axle.	Check the constant velocity joint and replace if necessary.
Increased noise in neutral gear with engine running	Wear of the input shaft gear bearing.	Check bearing and replace if necessary.
	Drive gear bearing wear.	Check bearing and replace if necessary.
	Bearing race wear	Check bearing race and replace if necessary.
Increased noise only in first gear	Wear, chipping or scuffing on gears with constant mesh 1st gear.	Check gears and replace if necessary.
Increased noise only in first gear	Worn, chipped or scuffed 1st/2nd gear synchro.	Check the synchronizer and replace if necessary.
Increased noise only in second gear	Wear, chipping or scuffing on gears with constant meshing in 2nd gear.	Check gears and replace if necessary.
Increased noise only in second gear	Worn, chipped or scuffed 1st/2nd gear synchro.	Check the synchronizer and replace if necessary.
Increased noise only in third gear	Wear, chipping or scuffing on gears with constant mesh 3rd gear.	Check gears and replace if necessary.
Increased noise only in third gear	Worn, chipped or scuffed 3rd/4th gear synchro.	Check the synchronizer and replace if necessary.
Increased noise only in 4th gear	Wear, chipping or scuffing on gears with constant mesh 4th gear	Check gears and replace if necessary.
	Worn, chipped or scuffed 3rd/4th gear synchro.	Check the synchronizer and replace if necessary.
	Wear, chips or burrs on the output shaft gear.	Check gear and replace if necessary.
Increased noise only in 5th gear	Wear, chipping or scuffing on gears with constant mesh 5th gear	Check gears and replace if necessary.
	Worn, chipped or scratched 5th gear/reverse synchro.	Check the synchronizer and replace if necessary.
	Wear, chips or burrs on the output shaft gear.	Check gear and replace if necessary.
Increased noise only in reverse	Wear, chipping or scuffing on gears with constant reverse engagement.	Check gear and replace if necessary.
	Worn or damaged output shaft gear.	Check gear and replace if necessary.
	Worn or damaged input shaft gear.	Check gear and replace if necessary.
Increased noise in all gears	Low fluid level.	Add fluid to the correct level.
	Worn or damaged wheel bearings.	Check wheel bearing and replace if necessary.
	Worn, chipped or scuffed gears on the input/output shaft.	Check gear and replace if necessary.
	Worn output shaft gear bearing.	Check gearbox output shaft bearing and replace if necessary.
	Loosen the shift rod guide bolt.	Tighten the shift rod guide bolt.
	Worn, chipped or scuffed 1st, 2nd, 3rd, 4th, 5th or reverse gears.	Check components and replace if necessary.
Gear slip	Loose mounting brackets of the gearbox with final drive assembly.	Tighten or replace hangers.
	Bent or worn cables.	Check cables and replace if necessary.
	Destruction or loosening of the fastening of the bearing retainer of the input shaft gear.	Check shift fork and replace if necessary.
	Worn or bent shift fork.	Check shift fork and replace if necessary.
	Dirt on clutch housing and engine.	Clean clutch housing and engine.
	Rigid seal for selector lever.	Check seal and replace if necessary.
	Internal malfunction of the shift mechanism of the manual transmission with final drive assembly.	Dismantle the gearbox with the final drive assembly, make the necessary repairs.
Gear slip on acceleration	Missing or incorrectly adjusted thrust bearing or thrust ring for first gear.	Check bearing and washer and replace if necessary.
	Worn or damaged 1st gear spline lock on 1st/2nd gear synchronizer.	Check slotted lock and replace if necessary.
	Worn or damaged 2nd gear spline lock on 1st/2nd gear synchronizer.	Check slotted lock and replace if necessary.
	Worn or damaged 3rd gear spline lock on 3rd/4th gear synchronizer.	Check slotted lock and replace if necessary.
	Worn or damaged 4th gear spline lock on 3rd/4th gear synchronizer.	Check slotted lock and replace if necessary.
	Worn or damaged 5th gear spline lock on 5th/Reverse synchronizer.	Check slotted lock and replace if necessary.
	Worn or damaged reverse gear spline lock on 5th gear/reverse synchronizer.	Check slotted lock and replace if necessary.
	Worn or damaged 1st, 2nd, 3rd, 4th, 5th or reverse gear spline lock.	Check slotted lock and replace if necessary.
	Internal malfunction of the shift mechanism of the manual transmission with final drive assembly.	Dismantle the gearbox with the final drive assembly, make the necessary repairs.
Gear slippage when coasting	Damaged, worn or missing shift rods.	Check gearshift rods and replace if necessary.
Gear slippage when coasting	Internal malfunction of the shift mechanism of the manual transmission with final drive assembly.	Dismantle the gearbox with the final drive assembly, make the necessary repairs.
Fluid leak	High liquid level.	Drain excess liquid.
	Axle seals damaged.	Check axle seals and replace if necessary.
	The vent cover is clogged.	Clean or replace the vent cover.
	Poor seal on shift housing.	Replace sealant on shift housing.
	Poor seal between transaxle case assembly and clutch case.	Replace sealant between transaxle case assembly and clutch case and tighten.
	Bad seal on back cover.	Replace the sealant on the back cover and tighten.
	Poor seal or loose reversing lamp switch.	Tighten switch or replace sealant if necessary.