What people keep running into with transmission
Complaints tagged transmission, each raised by more than one person. One-off posts are not included.
44 recurring problems · 711 people · 22 forums we read
Raised more than once
Most people first.
- 7Why does my manual car make a squealing noise when shifting gears?A manual transmission can make a squealing or clunking noise while shifting through gears, even when the engine is turned off. This makes it difficult to pinpoint the mechanical cause, leaving drivers uncertain about whether worn engine mounts or other components need replacement.
- 7Car makes whirring noise that stops when I press the clutchA whirring sound while driving that disappears when the clutch pedal is pressed all the way in typically points to an internal transmission issue, such as a worn input shaft bearing. When you depress the clutch, the transmission input shaft stops spinning, which silences the noise. This prevents you from ignoring a failing component that could eventually cause total transmission failure.
- 6Do I refill engine oil based on what I drained or the manual?Manufacturers specify capacity for a completely dry engine, which is always more than what actually drains out during a standard oil change due to residual fluid trapped in internal galleries. Pouring in the full manual amount based on a partial drain will overfill the crankcase, whereas trusting the dipstick ensures you hit the correct operational level safely.
- 6Why does the clutch pedal stay down and feel soft?When a clutch pedal is held down, it can fail to spring back and feel unusually soft, making it difficult to shift gears. This often happens shortly after a clutch replacement, sometimes causing the car to stall or making screeching noises when the pedal is pressed.
- 6Buying a used car when the owner doesn't know the maintenance historyWhen a used car has an unknown service history, buyers cannot verify if critical components like the timing belt are overdue for replacement. This makes it impossible to know if the deal is actually safe or if an expensive breakdown is waiting to happen.
- 6Why is my car showing random dashboard warning lights?Intermittent dashboard warnings can appear even when components like brake pads have plenty of life remaining, or trigger brief gearbox errors while driving normally. These phantom alerts are often caused by glitchy sensors, loose wiring connections, or minor software hiccups rather than actual mechanical failure, leaving drivers unsure whether it is safe to keep driving.
- 5What do scratches and marks on engine cylinder walls mean?Visible markings or potential scoring seen on cylinder walls through a borescope often create uncertainty about whether the engine has sustained serious damage or cylinder wash from a no-start issue. This leaves owners unsure if the marks are critical or safe to leave alone, or what cleaning steps might be necessary.
- 5Why does my automatic transmission get stuck in low gear when accelerating?Automatic transmissions can get stuck in a lower gear and refuse to upshift during acceleration until you lift your foot off the gas pedal. This forces the car to rev high without shifting, preventing normal acceleration and smooth driving.
- 5How to remove baked-on old gasket maker and RTVOld gasket sealant and RTV become super cooked and baked onto metal engine blocks, making scrapers, wire brushes, and chemical sprays agonizingly slow and tedious to use. This makes cleaning the mating surfaces take hours of tedious picking, stalling the entire rebuild process.
- 4Manual transmission still making noise after fluid top offTopping off the transmission fluid can quiet most gears, but a specific gear like 6th can continue to wear down and grow noisier if internal components are already damaged. This persistent wear leads to total gear failure, effectively turning a multi-speed transmission into a lower-speed unit.
- 4Why do RPMs jump while holding a steady accelerator?When holding steady pressure on the accelerator, engine RPMs can jump repeatedly while the car's power goes in and out. This surging occurs during acceleration even after completing gearbox adaptations and fluid top-offs, and it may be accompanied by crankshaft position signal failure codes.
- 4Can I reuse a damaged flywheel with grooves and hot spots?Flywheels showing unusual grooves, hot spots, or questionable wear are generally unsafe to reuse due to the risk of failure under stress. When working with limited funds, attempting to reuse damaged components can prevent a proper clutch engagement and lead to catastrophic drivetrain failure.
- 4Why does my clutch slip when hot and drag when shifting?Heat buildup from traffic or heavy acceleration can cause the clutch to slip under load while simultaneously failing to fully disengage, leading to gear grinding and delayed engagement. This dual failure makes the car difficult to shift and hesitation-prone when trying to move from a stop.
- 3Can I bypass a leaking factory transmission cooler with a universal cooler?When a factory transmission cooler built into the condenser starts leaking, you can bypass it by installing an external universal transmission oil cooler to avoid replacing the entire AC unit. This allows you to restore cooling functionality without messing with the air conditioning system, provided you choose the right size for your vehicle.
- 3Can I drive with low transmission fluid until I fix the leak tomorrow?Driving with fluid levels below the recommended fill lines risks severe internal damage and complete component failure. Attempting to drive even short distances or at low revs can permanently destroy the transmission before you reach a service center.
- 3Why does my manual car keep rolling down hills in gear?Manual transmission cars can slip and slowly roll downhill when parked on steep slopes, even when left completely in first gear or with the handbrake pulled all the way up. This intermittent creeping happens in intervals and prevents drivers from securely parking without also utilizing reverse gear to lock the transmission.
- 3White substance or milkshake fluid in transmissionFluid settling shows a white substance at the bottom of the bottle or a milkshake-like appearance, which often points to issues with a failing transmission cooler or head gasket. This contamination stops the transmission from operating with clean fluid and can lead to major mechanical damage if the leaking component isn't fixed.
- 3Weird engine noise after clutch replacementThe clutch disc may have been installed backward, causing its back side to hit the flywheel bolts. This creates an awful noise when starting and prevents the engine from running smoothly, leaving drivers afraid to keep the car running for fear of further damage.
- 2Can you swap transmission internals into a new housing instead of welding?Welding a cracked transmission housing carries a high risk of failure and future complications. Instead of risking a weld, you can extract the working internals, clutch pack, and mechatronic unit and transfer everything into a healthy donor case to ensure the repair is done properly.
- 2Passenger side transmission axle seal leaking after replacementDifferential seals often feel slightly too large for the bore or difficult to seat squarely, which leads to improper installation during CV axle replacement. This mistake causes transmission fluid to leak slowly or dump completely out within a day.
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