Diagnosing signs of mechanical transmission malfunctions (Chevrolet Captiva 1)

Complaint/condition	Possible cause	Method of elimination
Knocking noise at low speeds	Wear of the drive axle connection.	Check the drive axle connection and replace if necessary.
Knocking noise at low speeds	Wear of the inner diameter of the axle gear or satellite.	Check the differential housing and replace if necessary.
Increased noise when turning	Wear of differential gears.	Check differential gears and replace if necessary.
A dull thumping sound when accelerating or decelerating	The engine mount has become loose.	Check engine mounts and tighten if necessary.
	Wear of the internal connection of the drive axle.	Check the internal connection of the drive axle and replace if necessary.
	Wear of the differential gear shaft.	Check the differential gear shaft and replace if necessary.
	Wear of the axle gear hub bore.	Check the bore of the axle gear hub and replace if necessary.
Clicking sounds 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 with engine running	Wear of the primary shaft gear bearing.	Check the bearing and replace if necessary.
	Worn out driven gear bearing.	Check the bearing and replace if necessary.
	Wear of bearing races	Check the bearing race and replace if necessary.
Increased noise only in first gear	Wear, chipping or scoring on the 1st gear constant mesh gears.	Check gears and replace if necessary.
Increased noise only in first gear	Wear, chipping or scoring on the 1st/2nd gear synchronizer.	Check the synchronizer and replace if necessary.
Increased noise only in second gear	Wear, chipping or scoring on the 2nd gear constant mesh gears.	Check gears and replace if necessary.
Increased noise only in second gear	Wear, chipping or scoring on the 1st/2nd gear synchronizer.	Check the synchronizer and replace if necessary.
Increased noise only in third gear	Wear, chipping or scoring on the 3rd gear constant mesh gears.	Check gears and replace if necessary.
Increased noise only in third gear	Wear, chipping or scoring on the 3rd/4th gear synchronizer.	Check the synchronizer and replace if necessary.
Increased noise only in fourth gear	Wear, chipping or scoring on 4th gear constant mesh gears	Check gears and replace if necessary.
	Wear, chipping or scoring on the 3rd/4th gear synchronizer.	Check the synchronizer and replace if necessary.
	Wear, chipping or scoring on the secondary shaft gear.	Check the gear and replace if necessary.
Increased noise only in fifth gear	Wear, chipping or scoring on 5th gear constant mesh gears	Check gears and replace if necessary.
	Wear, chipping or scoring on the 5th gear/reverse synchronizer.	Check the synchronizer and replace if necessary.
	Wear, chipping or scoring on the secondary shaft gear.	Check the gear and replace if necessary.
Increased noise only in reverse	Wear, chipping or scoring on the constant-engagement reverse gears.	Check the gear and replace if necessary.
	Worn or damaged secondary shaft gear.	Check the gear and replace if necessary.
	Worn or damaged input shaft gear.	Check the gear and replace if necessary.
Increased noise in all gears	Low fluid level.	Add liquid to the appropriate level.
	Worn or damaged wheel hub bearings.	Check the wheel hub bearing and replace if necessary.
	Wear, chipping or scoring on the primary/secondary shaft gears.	Check the gear and replace if necessary.
	Secondary shaft gear bearing wear.	Check the secondary shaft bearing of the gearbox and replace if necessary.
	Loosen the shift rod guide bolt.	Tighten the shift rod guide bolt.
	Wear, chipping or scoring on the 1st, 2nd, 3rd, 4th, 5th gear or reverse gears.	Check components and replace if necessary.
Gear slippage	The gearbox suspension mounts with the final drive assembly have become loose.	Tighten or replace suspensions.
	Kinked or worn cables.	Check the cables and replace if necessary.
	Destruction or weakening of the primary shaft gear bearing retainer.	Check the gear shift fork and replace if necessary.
	Worn or bent gear shift fork.	Check the gear shift fork and replace if necessary.
	Dirt on the clutch housing and engine.	Clean the clutch housing and engine.
	Rigid seal for gear selector lever.	Check the seal and replace if necessary.
	Internal malfunction of the gearshift mechanism of the manual transmission with the final drive assembly.	Disassemble the gearbox with the final drive assembly and carry out the necessary repairs.
Gear slippage when accelerating	Missing or incorrectly adjusted thrust bearing or thrust ring of first gear.	Check the bearing and washer and replace if necessary.
	Wear or damage to the spline lock of the first gear on the 1st/2nd gear synchronizer.	Check the spline lock and replace if necessary.
	Wear or damage to the spline lock of the second gear on the 1st/2nd gear synchronizer.	Check the spline lock and replace if necessary.
	Wear or damage to the spline lock of the third gear pinion on the 3rd/4th gear synchronizer.	Check the spline lock and replace if necessary.
	Wear or damage to the spline lock of the fourth gear pinion on the 3rd/4th gear synchronizer.	Check the spline lock and replace if necessary.
	Wear or damage to the spline lock of the fifth gear on the 5th gear/reverse synchronizer.	Check the spline lock and replace if necessary.
	Worn or damaged reverse gear spline lock on 5th gear/reverse synchronizer.	Check the spline lock and replace if necessary.
	Wear or damage to the spline lock of the 1st, 2nd, 3rd, 4th, 5th gear or reverse gear.	Check the spline lock and replace if necessary.
	Internal malfunction of the gearshift mechanism of the manual transmission with the final drive assembly.	Disassemble the gearbox with the final drive assembly and carry out the necessary repairs.
Gear slippage when coasting	Damaged, worn or missing gear shift rods.	Check the gearshift rods and replace if necessary.
Gear slippage when coasting	Internal malfunction of the gearshift mechanism of the manual transmission with the final drive assembly.	Disassemble the gearbox with the final drive assembly and carry out the necessary repairs.
Liquid leak	High liquid level.	Drain off excess liquid.
	The axle shaft seals are damaged.	Check the axle shaft seals and replace if necessary.
	The vent cover is clogged.	Clean or replace the vent cover.
	Poor seal on gear shift housing.	Replace the sealant on the gear shift housing.
	Poor seal between the gearbox housing with the final drive assembly and the clutch housing.	Replace the sealant between the gearbox housing with the final drive assembly and the clutch housing and tighten.
	Poor seal on the back cover.	Replace the sealant on the back cover and tighten.
	Poor seal or loose reversing light switch.	Tighten the switch or replace the sealant if necessary.