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 ...
motosubatsu's user avatar
37 votes
Accepted

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'...
Bob Cross's user avatar
  • 24.4k
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 ...
Nick C's user avatar
  • 28.8k
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).
CharlieRB's user avatar
  • 9,035
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 ...
jkf's user avatar
  • 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 ...
jwh20's user avatar
  • 12.1k
22 votes
Accepted

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 ...
Bob Cross's user avatar
  • 24.4k
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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
JPhi1618's user avatar
  • 13.3k
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 ...
Kenny's user avatar
  • 260
15 votes
Accepted

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 ...
JPhi1618's user avatar
  • 13.3k
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.
PeteCon's user avatar
  • 8,702
14 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 ...
motosubatsu's user avatar
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 ...
Z4-tier's user avatar
  • 241
13 votes
Accepted

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 ...
Zaid's user avatar
  • 39.2k
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 ...
JPhi1618's user avatar
  • 13.3k
13 votes
Accepted

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.
Moab's user avatar
  • 8,010
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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
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 ...
DucatiKiller's user avatar
  • 32.9k
12 votes
Accepted

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 ...
cdunn's user avatar
  • 9,316
12 votes
Accepted

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 ...
JPhi1618's user avatar
  • 13.3k
12 votes
Accepted

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 ...
Rory Alsop's user avatar
  • 18.6k
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 ...
Zaid's user avatar
  • 39.2k
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 ...
anonymous2's user avatar
  • 5,235
11 votes
Accepted

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 ...
kyle_engineer's user avatar
10 votes
Accepted

Transmission damage due to uneven tread wear on AWD vehicle

They likely do hold some liability, since they should have known that an AWD should have matching tire diameters across all tires. They may argue that you hold some responsibility since the Impreza ...
Johnny's user avatar
  • 452
10 votes
Accepted

How Does a Quick Shifter work in a motorcycle

Why the Quick-Shifter? Since these are called quick-shifters we'll dub slow-shifting the traditional way of shifting gear. When you slow-shift you usually close the throttle, disengage the clutch, ...
JoErNanO's user avatar
  • 1,775
10 votes
Accepted

Why is it almost impossible to put the car in first gear at high speeds?

There are physical limits to sychronizers. When you upshift the synchronizer slows the clutch down which is relatively easy. When you down shift the synchronizer has to speed the clutch up which is ...
vini_i's user avatar
  • 16k
10 votes
Accepted

Driving down hill in gear without throttle

As you say you change gear from 3rd to 4th, this means you have changed the gear ratio between the engine and the wheels causing a different engine rpm.
Solar Mike's user avatar
  • 34.7k

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