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These are questions regarding transmissions in general (either manual, automatic or CVT transaxles and their component parts). This tag is not for questions specific to any type of transmission. Instead, use [manual-transmission], [automatic-transmission], or [cvt-transmission] INSTEAD. Use this tag if the question is relevant to multiple types of transmissions.

10 votes
Accepted

Semi-automatic car inadvertently driven in manual mode

I have heard that most modern cars have rev limiters which prevent damage - is this just to prevent damage to the engine, transmission or both? … The rev limiter is there to protect the engine, often to prevent problems caused by the transmission (or the human operator's use thereof). Would that help in this situation? …
Bob Cross's user avatar
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14 votes
Accepted

Driving in second gear at 65+ mph

It's definitely not great. The redline is there for a reason. That shaking was likely the engine speed limiter looking at the RPMs and saying, "yes, that's high enough." The speed limiter can be ei …
Bob Cross's user avatar
  • 24.5k
9 votes

What is the life expectancy of a Honda Civic Hybrid Continuously Variable Transmission?

What follows is not a mechanical fix. That said, I think you are going to have to solve this as a people problem first. Based on the answers in the comments, I would recommend the following: Colle …
Bob Cross's user avatar
  • 24.5k
4 votes

Switching gears without clutch

Question: given that clutch-less shift is executed properly, does it take a toll on transmission in any way? See Rory's answer: it is possible to do properly without wear. …
Bob Cross's user avatar
  • 24.5k
4 votes

What happens when cranking vehicle in gear?

Assuming that you have somehow managed to defeat any modern safety features then, yes, you will be turning the transmission. … The starter motor will engage the flywheel and will try to turn the in-gear transmission using electrical power alone. …
Bob Cross's user avatar
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8 votes
Accepted

Engine braking with an automatic transmission

This problem clearly illustrates the situation: the overdrive button just allows the transmission to select an even higher gear, primarily for increased mileage at high speeds. … There is a finite resolution of the pulley adjustment mechanism that allows the engine computer to direct the transmission. …
Bob Cross's user avatar
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3 votes

How does a belt drive CVT variator work?

Summarizing my own answer to Engine braking with an automatic transmission: Using the pictures from the Nissan CVT overview site: You can see that there are two variable diameter pulleys connected … There is a finite resolution of the pulley adjustment mechanism that allows the engine computer to direct the transmission. …
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7 votes
3 answers
4k views

Is Redline Lightweight Shockproof appropriate for an aging 2004 Subaru Impreza manual gearbox?

I have heard about Redline Lightweight Shockproof and was looking for two answers: Is this an appropriate oil for the transmission in question (i.e., any risks)? …
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13 votes
Accepted

Is downshifting on hills harmful for non-trucks?

Let's use specific examples of when you should use your transmission for engine braking: Waimea Canyon or Mount Washington. … In fact, at the Mount Washington Auto Road, they will not let you proceed up or down the hill unless you are in "2" on an automatic transmission vehicle. …
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3 votes

How do the cycles of the engine get converted into cycles of the wheels?

Transmission gearing (the gear ratios that you've seen cited). Final drive (this is a base multiplier that you don't normally hear about). … Transmission gearing = 3.454 (first gear in my car) Final drive = 3.9 (again, from my car) That gives us a combined ratio of 3.454 * 3.9 = 13.5 (approximately). …
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5 votes
Accepted

Is my automatic transmission broken?

we opened the hood and checked the transmission fluid: empty. ... I bought a quart of the appropriate transmission fluid and poured it in At least two things have gone wrong: 1. … Your transmission fluid went dry (automatic transmission is not going to work without fluid). 2. You didn't put in nearly enough replacement fluid. …
Bob Cross's user avatar
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1 vote

How bad is it for transmission if you release clutch without gas in second gear?

In first gear, the engine would be able to rotate the transmission and wheels fairly easily. … This is a futile effort since the motionless side (connected to the transmission and the road) is not interested. …
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1 vote

CVT on 6 cylinder cars

I discussed the popularity of CVTs with a local vendor during my wife's shopping for a new car. The vendor in question was trying very hard to convince us that a CVT was just as good as a regular aut …
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  • 24.5k
5 votes

Applying handbrake when car is barely rolling

Can this cause any potential damage to the car? Almost certainly not. This is exactly what the hand brake (AKA the parking brake) is useful for. The brake stopped the car just as it was intended to. …
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4 votes
Accepted

Can't move Chrysler 300M gear selector out of park

My wife had a similar problem with her Outback at one point. There is a shift lock preventing the level from moving out of park when you press the brake. First, check to see if you can just unlock …
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