These are questions regarding either manual or automatic gearboxes and their component parts.

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3
votes
1answer
16 views

Weird grinding sound from the gear box

It is not like when you try to shift a manual stick without the clutch. But a lot lighter than that varying in amplitude (louder and lower) and probably is only there when the engine is cold (Because ...
1
vote
0answers
6 views

use SAE80W/90 instead of EP90 [duplicate]

Can I always use SAE80W/90 API GL5 instead of EP90 for my good old Masport lawn mower's gears? I can't get EP90, which the manual asks for, anymore. ...
7
votes
6answers
82k views

Car shakes when in gear at red light

I bought a '96 Toyota Camry about a month ago. When I first turn the car on and the engine is cold, I can have the car stopped (in gear) and it will not shake. The idle RPMs will be at 1000. After ...
14
votes
5answers
8k views

Manual transmission at stop: 1st with clutch in, or neutral with clutch out? -OR- Throwout Bearing wear

When sitting in traffic or at a long red light, is the Best Practice to have the car in 1st gear with your foot on the clutch, or in neutral with your foot off the clutch? Some say that you should be ...
6
votes
1answer
57 views

How come gears don’t normally change in an automatic car?

I know that there is a similar question here, and another one here that asks when an automatic gearbox knows how to change gear, but I want to know exactly how it does that. It was brought to my ...
4
votes
2answers
3k views

Motorcycle gears seem really stiff and hard to shift when cold

So I have noticed that even for a fruther 10 to 15 mins after warm up, the gear lever on my motorcycle (bought brand new - 6 months old) seems really stiff and harder to change. Could this have ...
4
votes
3answers
4k views

Bike is sometimes not wanting to shift into neutral

I have a 1982 Suzuki SP250. The bike "doesn't want" to shift into neutral sometimes. I have to rock it back and forth and shift up and down the gears a for a while before it shifts. I have changed the ...
6
votes
1answer
48 views

What does it mean to have a stiff first gear?

This problem is a small one and it can only occur with manual cars, but I have been curious to find out more about it for a while now. Sometimes, when the car is attempting to pull away from a ...
6
votes
3answers
2k views

What determines when an automatic transmission shifts?

I'm working on developing an automatic bicycle (mostly microcontroller based) and I'd presume I'd be shifting in a similar way to a car. So my question is, what factors does the transmission take into ...
3
votes
2answers
535 views

How to know when automatic-transmission box needs to be changed?

My friend is very odd: this thread about durability comparison between automatic/manual durability meant to him that manual is always better option because you can learn to change the clutch and only ...
8
votes
1answer
395 views

Why did manufacturers go to other than 1:1 transmission ratios?

While reading this question it came to mind: Why did manufacturers start building transmissions without a 1:1 ratio? In the older transmission you'd see the 1:1 ratio all the time, either as the ...
9
votes
2answers
20k views

Engine revs high 5th gear manual transmission

What might cause a car with a manual transmission that in 5th gear when given a punch of gas revs to very high rpms – with no power transferred to the wheels (i.e. the tachometer and speed go ...
11
votes
1answer
84 views

Why don't cars use Sequential gearboxes?

I have always felt that the Sequential Gearbox configuration is much much faster than a ordinary gearbox used in cars. Why is this design used ? Any advantages? Note: I am aware that racing ...
4
votes
1answer
39 views

Acceleration pickup of a car

When I say "Tata Winger can accelerate from 0 to 100 Kmph in nearly 19 to 20 seconds, which is quite good for this class" - how is it measured? Is this by accelerating the car from 0 to 100 kmph on a ...
21
votes
5answers
4k views

What is the technical reason the engineer decided the motorcycle gear pattern as follows?

The gear pattern is selected by clicking a lever with your left foot, and is typically laid out as follows: 6th gear (if applicable) 5th gear 4th gear 3rd gear 2nd gear NEUTRAL 1st gear What ...
4
votes
0answers
38 views

2008 Vw Jetta won't move? Transmission issue!! Help [closed]

I have a 2008 Vw Jetta 2.5l. On the way to work this morning I stopped at a stop sign and when I took off I heard a clunk and had to coast off the road. It is an automatic transmission and I can put ...
61
votes
17answers
96k views

Does Downshifting (Engine Braking) Cause Extra Wear and Tear?

Does the act of downshifting to slow your vehicle down have any negative side affects? I don't downshift more than one or two gears at a time and I let out on the clutch slow enough that I don't rev ...
6
votes
2answers
53 views

Gear selection on 6 speed box

Hi I have a Peugeot 308 1.6 ehdi with a six speed manual gearbox and have noticed that when selecting first or sixth gear it does not go in smoothly it can be notchy or clunky this is quite annoying ...
11
votes
4answers
10k views

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

I have a 2006 Honda Civic Hybrid with continuously variable transmission (CVT). At the 90k tuneup, the mechanic added 3.5 quarts of the regular automatic transmission fluid. At 110,000 miles, the ...
6
votes
1answer
27 views

Scania clutch issue with syncromesh gearbox

The clutch of our 124 Scania stopped working properly with the "14 speed" syncromesh gearbox. The first time it happened, it ground instead of smoothly going into reverse (a non-syncro gear), to back ...
4
votes
1answer
40 views

What is meant by the term “gear ratios”?

I don't really understand the idea behind gear ratios. Does this just mean essentially that the gears (cogs) are all different sizes? What specifically does the term "gear ratios" mean?
5
votes
0answers
45 views

Th400 Transmission help

I pulled my Th400 out of my K20 Chevy and I'm in the middle of rebuilding it and I was resembling it and when I went to put the completed gear train assembly in it and the center support assembly gets ...
12
votes
4answers
1k views

Why do 5- and 6-speed transmissions typically need different gear ratios?

My 2013 Subauru WRX has a 5-speed manual, and I long for it to have a 6th gear when cruising on the highway. A friend has a 2012 Subaru STI with a 6-speed manual, and I noticed his car runs through ...
3
votes
1answer
33 views

What exactly is a gearbox?

You know that gear stick that we all use so much? Well, I know what it does in the sense that I know how to change gear and drive a car with a manual gearbox, but I don't know much more than that. ...
6
votes
2answers
128 views

Yamaha YZ125K 1983 transmission bearings

I'm restoring an engine and am unable to locate 3 gearbox bearings. Identifying mark is either IXO or IKO. It is a needle roller bearing type and sits RHS crank case 1/3rd gear shaft. Mark clearly ...
7
votes
1answer
25 views

I own a 1989 Mercedes 560sec that has rpm surges for no real reason

It happens once or twice a month, I could be doing 60 mph, and its almost redlining at 5000 rpm!. Once the vehicle gets to normal operating temperature, and I turn it off for a few minutes and turn it ...
2
votes
2answers
7k views

Why bikes with gears are preferred when there is gearless(or automatic gear) technology?

I know that lower gears have higher acceleration & low top speeds and higher gears have low acceleration & higher top speeds. But I would like to know why this gear system was designed ...
6
votes
1answer
599 views

Clutchless Downshifts Using Throttle Blip on a Motorbike/Sequential Gearbox

This is with respect to non synchromesh, sequential transmission. Ducati along with several after market systems, implement clutchless downshifts by automatically applying a slight throttle to unload ...
2
votes
1answer
47 views

Dealer can't program new ECU for 2001 Mercury Cougar because of transmission type

I brought the original ECM in to order a replacement, put it in myself, and then towed the car to Ford. Now they are saying they can't program it because the computer is for a manual and my car is an ...
4
votes
2answers
143 views

Transmission sticky for first 10 mins of driving

I have a 2003 VW golf with the 2.0L petrol engine and a manual transmission. I recently had the transmission fluid changed as part of a regular maintenance. Ever since shifting into 2nd gear has ...
3
votes
1answer
32 views

1998 Nissan Sentra transmission

Why does a 1998 Nissan Sentra Automatic transmission change to neutral from reverse while going downhill? This just started a couple of weeks ago. The engine shut off the first couple of times it ...
1
vote
1answer
31 views

I have a 2000 Suzuki Grand Vitara 5 Speed Ticking noise

I hear a ticking noise coming from the driver side rear end, possibly coming from the differential, not sure though because i checked out the pinion gear and i don't see any chips off any of the ...
2
votes
2answers
139 views

Problem in First and 2nd gear in VW polo

Dear i am facing problem in first and 2nd gear in my VW POLO DIESEL car.i am unable to move car in these gears,i tried it so many times.so for the time being i used 3rd gear to move the car & ...
3
votes
1answer
84 views

Transmission damage due to uneven tread wear on AWD vehicle

I have a 2013 Subaru Impreza with a continuously variable transmission with ~40k miles on it. About two months ago I blew out the front right tire and took it to a tire shop. The folks at the tire ...
7
votes
2answers
896 views

Why do hybrids still use mechanical transmission?

One of the comments on this question reminded me of something I've been wondering for a while. Given that engines get the best efficiency at peak torque, why do most hybrid cars still use a mechanical ...
2
votes
1answer
65 views

Hesitation in RPM drop when shifting manual transmission, 2007 Mazda6

I recently said goodbye to a 2002 Mazda Protege that made it to just over 300,000 miles. So naturally I purchased another Mazda - 2007 Mazda6, 5-speed manual, 91k miles. Besides the difference in ...
4
votes
2answers
3k views

Do I need computer reprogramming when transmission is replaced?

Honda Odyssey 2003: I'm replacing a transmission, and a local mechanic will help me to swap it in my garage. I've been told at a local shop, that in order to install remanufactured transmission ...
3
votes
1answer
87 views

Buick LeSabre 2002 automatic transmission not working

My Buick went crazy 2 days ago, the car won't move if you transit to overdrive from neutral, though the RPM is moving. If I start from 1st transition or 2nd the car works properly. After 3rd I can go ...
4
votes
3answers
10k views

Burning smell, leak, losing power. Maybe transmission related

First off, I know almost nothing about cars. I can fill them up with gas and drive them. That's about it. This car is a '99 Subaru Outback, automatic. When I last took my car in for an oil change, ...
3
votes
1answer
57 views

Gearbox impact of skipping gears driving downwards

I have a driving habit that i guess is harmless to the vehicle, and i want to hear your opinions on the matter. Sometimes i change the gears, for example, 1st then 3rd then 5th, when i am driving ...
1
vote
2answers
113 views

Location of fill tube for Nissan Pintara auto transmission fluid

Where on a 2.4lt 1989 Nissan Pintara do you put the transmission fluid? I cannot seem to find where it would go and my vehicle is not changing gears properly.
0
votes
1answer
35 views

Chevrolet 6L90 transmission interchange

Are 6L90 transmissions interchangable between the different types of vehicles that GM puts them in? Example: Camaro and Silverado 2500HD
4
votes
1answer
151 views

Why are most motorcycles 5 speed than 6 speed?

I have a Honda Trigger motorcycle. I have seen most of the motorcycles even like Karizma ZMR having 5 gears. What would be the reason to have just 5 gears even for 223 cc motorcycles?
11
votes
5answers
24k views

2003 Chevrolet Impala - Jerks after Stopping

I have a 2003 chevy impala. When I hit the gas (whether it be a light tap or hit it pretty hard), my car kind of waits a second, jerks and then takes off (revs go kinda high when it's waiting). To ...
4
votes
1answer
80 views

Transmission Grinds only in second gear - Need Assistance

I have a 2003 Cadillac CTS, 6 cylinder 5 speed. 104,000 miles. changing from 1st-2nd gear, After letting out the clutch in 2nd gear it has a grinding sound until I shift to 3rd. And only 2nd gear has ...
3
votes
1answer
37 views

What would go into a tranny swap on a modern vehicle

I have a 1999 Isuzu trooper and I have been toying with the idea of doing an engine and transmission swap on it. If all goes well with the engine I plan on getting I would like to replace the ...
3
votes
1answer
292 views

Pulley Difference After Drive Belt Change

I have one worry after yesterday's fairly difficult but successful drive belt change on my Big Boy scooter. The main nut on the fron pulley now goes on much less further than before it came off. I ...
-2
votes
1answer
21 views

problem changing gear volkswagen polo 2001

I have problem changing gear with my volkswagen polo 2001. I was told that a ball is missing chendra Alwar
4
votes
1answer
39 views

Auto Trans gear selector does not engage ANYTHING?

2002 BMW 325xi. It has the GM 5L40-E auto trans. The vehicle disengaged drive while moving. My g/f was driving the car and the transmission was engaged i.e. power was being transmitted from the ...
2
votes
1answer
52 views

how electric car transmission system work

How electric car transmission system working? Is it having auto or manual gear concept like gasoline vehicles? AS electric motor can run in any speed (slow). Is it necessary to have clutch?