46 votes

Leaving car with automatic transmission in Neutral instead of Park

Depends on the car.. some won't let you remove the key from ignition if it's not in park. To be honest I really wouldn't worry about "crossing" reverse when heading for Park there is usually a slight ...
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  • 9,728
39 votes
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Need I press clutch pedal while starting my car in neutral?

It depends on the specific vehicle. Many modern standard transmission cars in the US have a clutch pedal sensor that will not allow you to start the vehicle if the pedal isn't fully depressed. You'...
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  • 24.3k
34 votes

How to add a 7th gear to a car to enhance fuel economy?

This is something that used to be quite common - in the '60s and '70s, people would add an electronic (or manual) overdrive to the back of the 4-speed gearbox to give an extra gear (usually two, as it ...
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  • 28.6k
29 votes

Leaving car with automatic transmission in Neutral instead of Park

The simple answer is "No". There is no useful reason/benefit to using the transmission any other way than it was designed. Use PARK (P).
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  • 9,035
27 votes

Why is a motorcycle's neutral between first and second gears?

Answer The technical reason that manufacturers have chosen to use a sequential shift pattern with their gearbox configurations is that a standard shift plate that allows the selection of any gear ...
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  • 32.8k
27 votes

Need I press clutch pedal while starting my car in neutral?

Being from Canada, I feel compelled to mention that if you do not depress the clutch while starting when it is at all cold out (let's say < 0 Celsius) you will notice the starter motor labouring ...
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  • 422
23 votes

What does exhaust smell on oil and transmission dipstick mean?

First of all you're not smelling CO (carbon monoxide) as that is an odorless and colorless gas. What you are likely smelling are combustion byproducts and that is not at all uncommon in the engine ...
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22 votes
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Why do 5 and 6-speed transmissions typically need different gear ratios?

tl;dr: different gear ratios are a feature, not a bug. Some cars use more gears for acceleration, some use them for better gas mileage. You can't do both. At 3300-3500 RPMs, shouldn't the WRX be ...
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  • 24.3k
17 votes

Use of Neutral Gear in Automatic Transmission

When the car is in D and you start the engine the hydraulic pump in the automatic transmission is not providing fluid pressure until the engine starts. This fluid pressure is used to engage clutches ...
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  • 181
16 votes

Do cars go from Drive to Neutral on their own?

To my understanding, no. I've never seen this behavior before in any auto I've ever driven or read about. I think it would be a safety issue if it did. If you needed to move suddenly (for whatever ...
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16 votes

Leaving car with automatic transmission in Neutral instead of Park

Because of the way an automatic transmission works, this really is a non-issue. You're probably thinking about how in a manual transmission, when you move the gear shifter, you are physically pushing ...
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  • 13.2k
16 votes

Leaving car with automatic transmission in Neutral instead of Park

Setting your car in Park does not cause wear of any kind, and most automatics I have driven will not start or let you remove the key in any other position than Park. First of all, I'd like to point ...
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  • 260
14 votes

Need to find out what part is called

It's not too clear which part you're referring to, so I've annotated your image with the most likely items.
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  • 8,612
14 votes
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How is it possible for the crankshaft RPM to not directly correlate to the driveshaft RPM?

The torque converter picks up the slack In essence, this device connects the engine crankshaft to the transmission's input shaft through a fluid-type coupling. Once the turbine spins fast enough ...
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14 votes
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Why aren’t drive chains completely taut?

The main reason slack is needed is the rear suspension of the bike. In a "perfect" setup, the axis of the rear swing-arm and the final drive of the engine would be one and the same. This is not ...
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  • 13.2k
14 votes

Accidentally put CVT into park

Shifting into park engages the parking pawl inside the transmission and physically locks up the gears. If that mechanism was engaged at sufficient speed and no safety existed to prevent it, most ...
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  • 241
13 votes

Does an increase in horsepower allow a greater speed in any given gear?

The answer is no because you mention being limited by your redline. Regardless of power, a certain RPM will result in a certain speed for a given gearing. Chances are the gear ratios were chosen ...
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  • 13.2k
13 votes

Why do you use the "park" gear to park a car and not only the handbrake?

Putting the transmission into "Park" engages the "parking pawl" - essentially a metal pin that locks the output shaft of transmission (and thus the driven wheels) in place. As to why it exists - it ...
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  • 9,728
13 votes
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94 Toyota Pickup hard to put into gear after clutch in too long

If its a hydraulic clutch, it may be bleeding off, either a leak or a bypassing clutch master cylinder.
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  • 7,940
13 votes

Accidentally put CVT into park

While it's definitely not good to do this, if it's running/driving fine, you've most likely suffered no damage. Considering the speed at which you did it was so low wasn't very fast and shouldn't have ...
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12 votes
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How do electric car transmission systems work?

I'm sure it can be done different ways, but I'll describe the Nissan Leaf, since it is one of the true electric cars on the market today (not a hybrid gas/electric). The Nissan Leaf does not use a ...
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12 votes

Why is it that the front of the car lifts up when releasing the clutch?

Newtons Third Law For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size ...
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12 votes
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How does the transmission not strip itself when applying the brake?

The somewhat longer answer is that the device that makes what you're asking possible is the torque converter. This device is a pair of curved blades setup as an impeller, and a turbine. The following ...
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  • 9,286
12 votes
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Skipping gears when downshifting

If your car is slowing down, and you are at a "safe" speed for 2nd gear, then its perfectly normal to skip gears. If you're going the wrong speed and the engine RPMs aren't even close to what they ...
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  • 13.2k
12 votes
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Do Manual transmission cars perform better than Automatic transmission?

The difference comes down to the driver. While automatic racing gearboxes can beat a driver when it comes to performance, for the type of vehicle you describe, a manual can perform significantly ...
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  • 18.5k
11 votes
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Why do hybrids still use mechanical transmission?

It depends on the type of hybrid car you are talking about. In one type of hybrid, there will be a gasoline engine and at least one electric engine capable of driving the wheels. In this case, the ...
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  • 2,045
11 votes
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Why did manufacturers go to other than 1:1 transmission ratios?

Gearbox designers should avoid integer ratios like the plague. For mechanical reasons. Integer ratios will accelerate wear and tear because it increases the frequency with which tooth A on the ...
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  • 39k
11 votes

What differences are there between straight cut and helical cut gears?

Great question! There are several basic differences. Here is my main article that I am pulling from. Firstly, straight-cut gears produce less side-to-side torque, allowing the engine to deliver much ...
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  • 5,215
11 votes
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Does an increase in horsepower allow a greater speed in any given gear?

Summarized Answer No, HP does not determine MPH in a gear, the gear ratio does. Although there are hypothetical ways that HP can seem to make the vehicle go faster in the same gear, it doesn't ...
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