ASE Manual Drive Train and Axles Flashcards
6 cards from real ASE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 ASE Manual Drive Train and Axles flashcards as text
A FWD vehicle makes a loud clunking noise during acceleration from a stop but not at steady speed. What drivetrain component is MOST likely at fault?
Answer: Worn or loose inner CV joint
A clunk under acceleration from a FWD vehicle typically indicates a worn inner CV joint or plunge joint that has excessive play and impacts under torque application.
When replacing a CV axle shaft, the technician notices the new boot clamp must be installed in a specific orientation. Why?
Answer: The clamp must face away from the rotation direction so the lip does not catch and peel back
Boot clamps must be oriented with their tightening tab trailing (facing away from the direction of rotation) to prevent airflow or road debris from catching the lip and loosening the clamp.
A 4WD vehicle with a transfer case makes a grinding noise only when in 4WD high or low but operates quietly in 2WD. What is the MOST likely cause?
Answer: Worn or damaged transfer case chain or planetary gears
Noise that occurs only when the transfer case is engaged points to internal transfer case wear, such as a worn drive chain or damaged planetary gears that only carry load in 4WD.
A manual transmission pops out of 3rd gear under load. What is the MOST likely cause?
Answer: Worn or damaged 3rd gear synchronizer hub or detent mechanism
A transmission that jumps out of gear under load typically has a worn synchronizer hub with rounded engagement teeth or a weak detent that cannot hold the shift rail in position.
What is the purpose of checking driveshaft runout and balance?
Answer: To diagnose vibration caused by a bent or out-of-balance shaft
Driveshaft runout (measured with a dial indicator) and balance (checked on a balancer) identify bends or mass imbalances that cause vibration at specific vehicle speeds.
Technician A says U-joint phasing refers to the alignment of the front and rear U-joint yokes on a driveshaft. Technician B says incorrect phasing can cause a second-order driveline vibration. Who is correct?
Answer: Both Technician A and B
U-joint phasing (yoke alignment) ensures the velocity fluctuations of the front and rear joints cancel each other; misphasing causes an additive vibration at twice driveshaft speed (second order).