Transmission & Drivetrain Flashcards
6 cards from real Automotive and Mechanics practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Transmission & Drivetrain flashcards as text
What does a limited-slip differential (LSD) do compared to an open differential?
Answer: Transfers more torque to the wheel with better traction when slip is detected
An LSD uses clutch packs or a Torsen gear set to bias torque toward the wheel with more traction, improving performance on slippery or uneven surfaces.
What is the purpose of the transmission valve body?
Answer: Direct hydraulic fluid pressure to actuate clutch packs and bands for gear changes
The valve body is the hydraulic control center of an automatic transmission, routing pressurized fluid to the correct clutch packs and bands to engage each gear.
What is a CV (constant velocity) joint used for?
Answer: Transmit torque at a constant rotational speed through a varying angle, used in front-wheel-drive axles
CV joints allow axle shafts to transmit smooth, constant-velocity torque to the front wheels while accommodating the up-and-down and steering angle changes.
What symptom indicates a failing outer CV joint?
Answer: Clicking or popping noise during turns
A worn outer CV joint typically produces a clicking or popping noise during turns because the ball-and-groove contact deteriorates, causing the joint to bind under angle.
What is transmission line pressure and why is it important?
Answer: Hydraulic pressure supplied by the transmission pump that controls clutch pack engagement force
Line pressure is the main hydraulic pressure developed by the transmission pump and controls how firmly clutch packs engage, affecting shift quality and durability.
What is the role of the transmission range sensor (TR sensor) or neutral safety switch?
Answer: Inform the ECU of gear selector position and prevent starter engagement in gear
The TR sensor tells the ECU which gear range is selected and prevents the starter from cranking in Drive or Reverse, protecting against accidental engagement.