Questions regarding automatic gearboxes, and associated parts such as torque converters

learn more… | top users | synonyms

7
votes
1answer
58 views

My rpms are going high and my mph take a minute to go higher on my GMC Yukon

When I put my truck in drive and step on the gas the RPM's go up to 3,000 but my MPH will stay at 10-15 When I let go of the gas a little bit I can feel the truck kind of pull and the RPM's will go ...
6
votes
1answer
58 views

2000 Celica engine dies or shakes when I pump gas

I have a 2000 Toyota Celica. At first it used to slip gears and then I had a mechanic check it out. He said its a solenoid in the transmission which he changed. The car sputters sometimes when at ...
14
votes
1answer
1k views

What is a governor and what is it used for?

I was watching a classic car restoration program on YouTube in which they were working on a '50s Cadillac with an automatic transmission. The mechanic in the video diagnosed a transmission glitch as ...
4
votes
1answer
31 views

Odd Transmission slip

My transmission gets these odd slips every once in a while. For example, today I was driving slow through town, I believe in second gear, and my foot was very light on the pedal. As I release the ...
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
590 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 ...
19
votes
8answers
137k views

What's the point of the D3 gear in an automatic transmission?

My Honda Civic has a D gear and a D3, which apparently prevents it from going into 4th. Why would I want to do this? What is it good for? Does it make my fuel efficiency better or worse? Does it ...
7
votes
1answer
85 views

Engagement delay when shifting from neutral to drive or reverse

My 2001 VW Eurovan (T4) has automatic transmission and about 160k miles on the clock. When I use the transmission selector to move from N to D or from N to R, there is a noticeable delay until I feel ...
4
votes
1answer
63 views

will not start, when I just had driven it about a hour ago

2003 grand am 4 door automatic,everything works, lights, radio, windows,buzzes when key is in ignition. I hear nice noise, if it was the battery all the other things in the car would not work. What ...
4
votes
1answer
42 views

How does PCS on 4l60e work?

Looking at the pinout for the connector for the 4l60e there are 2 pins for the pressure control solenoid. 1 pin for HIGH, and 1 pin for LOW. Does this mean the PCS can only ever be in 1 of 2 ...
4
votes
1answer
32 views

1994 Silverado not accelerating past 35

I have a 1994 Chevy Silverado. On my way to work today my truck would not accelerate past 35 mph but was revving high rpm's. I stopped and checked my fluids and my ATF wasnt showing anything on the ...
5
votes
0answers
53 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 ...
3
votes
4answers
2k views

RPM jumps up & back down at 40mph

My question is for a 2006 Dodge Magnum, 2.7 liter engine. Just over the past month or so, I noticed when I'm cruisung, just coming from a dead stop, when I'm at 40 mph my car kinda feels like it ...
16
votes
4answers
1k views

shifting stops when critically low on gas

I have a 1999 Dodge Dakota. It is a V6, 3.9 Liter, auto transmission. I have a weird problem that no one has been able to answer for me. HOW I CAME TO REALIZE THE PROBLEM: One day I was driving ...
3
votes
2answers
43 views

Mazda 3 2011 1.6 Lts Gasoline - ECU

I was wondering if its possible for a Mazda 3 2011 AT car to function without ECU? The reason I am asking is When I start the engine, the CheckEngineLight doesnot come at all When I took my car for ...
4
votes
1answer
143 views

2002 Subaru Legacy, Grinding Sound

Just got home from work and put my car into park and heard a grinding sound. The parking brake stopped working. I tried putting it into drive and got the same grinding sound. It was as if something ...
4
votes
1answer
84 views

2004 Ford Explorer accelerates too quickly from idle

I have a 2004 Explorer/v8/4wd/bauer edition. When I take off from a stop, there is a slight lag and then the vehicle over accelerates (sort of "jumps" off the line). If I gradually apply the ...
5
votes
1answer
157 views

Car cranks but will not start after transmission replacement

The 2006 Infiniti G35 would crank but not start after a transmission replacement. I found 2 transmission codes. U1000 which is a CAN bus code and P1815 which is the manual shifting code. It is an ...
6
votes
1answer
220 views

Excessive Vibrations in Drive when holding down the brakes

I'm working on a 98 Mazda 626 GF 2L with an automatic transmission. While I'm used to driving manuals, I would say that the amount of vibration when sitting stopped in drive with the brake on seems ...
5
votes
1answer
119 views

GF4A-EL Transmission Flush

I just got a 98 Mazda 626 2L and need to flush the atx fluid, it's really dirty brownish red, but not burnt and I didn't notice any particles in it. I think the car has a CD4E tranny ( it turns out ...
7
votes
2answers
87 views

Normal Operating Temp for an Automatic Transmission

While I was able to find information on testing the ATF temperature sensor in the GF4A-EL manual I've got: I was unable to find any info on the normal operating temperature of the transmission. ...
3
votes
1answer
180 views

Transmission sometimes downshifts forcefully with a clunk when I let off the gas 2003 Dodge Grand Caravan

As the title mentions, I have a 2003 Dodge Grand Caravan, and my transmission sometimes downshifts forcefully with a clunk when I let off the gas. It will do this no matter what gear I'm in (except ...
1
vote
1answer
65 views

'95 Chrysler Lebaron Shifting

I have a 1995 Chrysler Lebaron. 3.0L, V6, Automatic transmission. It has recently developed an issue where as you accelerate, it seems to get "stuck" in third(maybe?) gear. It will drive with that ...
1
vote
1answer
123 views

How to identify transmission issues

I have a new Camry L (4 cylinder 5 gear)with about 6k miles on it. Whenever I push the car from 0 to 30 mph and then let go easy on the gas to keep the car at 30-35, then I can feel the car 'jerking' ...
7
votes
1answer
195 views

What should one do to reduce the HP lost at the wheels on an automatic transmission?

I have a 1990 Toyota Supra Turbo 4 speed auto. I've done some research about automatic transmissions and manual transmissions and what are the positives and negatives of each. (For example, MT is said ...
2
votes
0answers
86 views

2000 mustang v6 3.8l tapping noise camshaft sychronizer bearing or timing chain? [closed]

My car makes this tapping noise (chain like tapping noise) and (most noticeable) when driving up hill, or at low speeds under a load. Another that has started to happen after this issue, is a type of ...
7
votes
1answer
74 views

Will increasing line pressure increase torque capacity?

I was wondering if one were to increase the line pressure sent to the clutch packs/bands on an A/T would that increase the torque capacity of said transmission? I figure it would because it would ...
4
votes
1answer
123 views

1999 Mazda 626 Auto Transmission Starts in 2nd, wont shift past 3rd

My wife has a 1999 Mazda 626 that had the transmission rebuilt 5 or 6 years ago. Recently the car started having problems starting unless it was shifted in to neutral. I replaced the neutral safety ...
0
votes
1answer
53 views

How to get in fourth gear

I have 2007 automatic Scion tC that I just bought and I was wondering how do I put it in 4th gear or (sport)?
1
vote
2answers
131 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.
1
vote
2answers
4k views

What does PRNDSB means?

My Daihatsu Mira does not have any manual, Its an automatic car with TurboEngine and Gear with PRNDSB. What does all these means? My car is four wheel drive as I can see rear differential in it. If ...
5
votes
1answer
82 views

Automatic Transmission - Reverse Flush, what is this procedure and why is it dangerous?

I recently, moments ago, saw in a post a mention of a reverse flush in reference to an automatic transmission fluid change. The responder mention the dangers of a reverse flush and that many of the ...
2
votes
0answers
73 views

Transmission Fluid Change - High Mileage Vehicle [closed]

Should I replace the ATF in a 2007 Honda Odyssey w/ 208,841 miles? Numerous shops advise against drain/ refill. I last changed @ 144k & was advised not to do it ascI could encounter transmission ...
7
votes
7answers
42k views

Strong vibrations when idling even after replacing engine mounts (automatic transmission)

I have a '93 Acura Integra with automatic transmission. Ever since I got it some time ago the car has been vibrating a lot when stopped at a light, for example. The vibration is worse when in gear ...
3
votes
1answer
309 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 ...
1
vote
1answer
57 views

What is happens to the brakes when an automatic drives below the speed for 1st gear with no added gas?

In a manual transmission car, when a driver wants to go below the speed the car travels at in first gear with no added gas using the gas pedal, you ease off the clutch, reducing the amount of power ...
1
vote
3answers
799 views

Toyota Corolla 2011 not accelerating when on 60mph or above

I recently bought a toyota corolla 2011 s from a local dealer with 80,000 miles on it. In my test drive everything seemed normal and was satisfied with the deal. But on a recent trip when i actually ...
2
votes
0answers
41 views

While in Drive, transmission failed to engage after stopping at light

I have a 2011 Nissan sentra. MESA remote start installed 2 weeks ago. It all works fine. However, last night stopped at light, went to go, and it's like neutral and the engine derates. However I don't ...
4
votes
1answer
82 views

Banging sounds coming in front of my car

I'm having a banging sounds coming from the front of my car. Usually they appear after 5-10 meters when I'm driving. It's like one small knock and then around 5-6 more knocks and then they stop until ...
1
vote
1answer
37 views

03 chevy impala trasmission will not go forward nor backwards

I have always checked the trans fluids and one day as i was heading out i started to give it gas and it went for a bit than as i pushed more on the gas...it would not go forward anymore. i than put it ...
0
votes
2answers
42 views

Neutral Gear Significance during slight downhills in Auto Transmission [duplicate]

I have got this habit of engaging the gear mode to neutral when I am in a smaller downhill and engaging back to drive mode if I need to further slow down or speed up. The primary objective of this ...
3
votes
2answers
993 views

Why do cars allow you to shift from Reverse to Neutral/Drive without brakes?

Every automatic transmission car I've driven (not sure if all do this) allow you to shift from Reverse to Neutral and from Neutral to Drive (and therefore Reverse all the way to Drive) without ...
4
votes
1answer
1k views

Does towing an automatic transmision car in neutal with engine not running will damage it?

My daughter had a friend tow her 1996 chevy. automatic transmission without engine running while in "N" SLOWLY for probably 7 or 8 miles distance. Do you think she has damaged the transmission? The ...
5
votes
1answer
10k views

Ford Escape won't shift into gear, O/D light flashing

I've got a 2002 Ford Escape (automatic transmission) that will start fine and reverse without any problems, but when I put it in drive and try to pull forward, it remains in idle. I can hit the gas ...
4
votes
2answers
900 views

Better to repair a CVT or replace with a used one?

Our 2003 Honda Civic Hybrid transmission died. Honda gave us an estimate of $4500 to replace the transmission. We took it to a different mechanic who suggested that instead of replacing the whole ...
0
votes
1answer
217 views

Is starting with my automatic transmission in Neutral a good idea? [closed]

I have bought an auto transmission sedan but have no idea how to drive it correctly. All I know is put to D gear, and just drive. I was wondering, is this the right way to use an automatic gearbox? ...
3
votes
2answers
400 views

2007 Nissan Frontier Transmission, Differential & Transfer Case service intervals for light driving?

According to the owner's manual service/maintenance guide, automatic transmission fluid, differential oil & transfer case oil should be inspected for leaks at the following intervals: ...
1
vote
0answers
221 views

Which is the best / most reliable car automatic gearbox technology for frequent climb mountain [closed]

Today we have in the market so many car with different types of automatic gearbox system, produced by many manufactures, like ZF, Getrag, Aisin... producing from conventional automatic gearbox, to ...
-1
votes
1answer
76 views

Drive no longer works on my Chrysler 300

I have 2006 300 Chrysler v-6 Hemi engine AWD 6 cylinder. I went to start my car this morning, put it in drive, but it wouldn't go. Then I put it in reverse and it would drive back as well as neutral. ...
2
votes
1answer
6k views

Auto transmission shifting late, staying in low gear

The mother-in-law's 2005 Renault Clio (auto) shifts very late and stays in too low a gear. When decelerating the tranny downshifts early (it really likes the revs). The garages all want a heafty sum ...