Question about 2006 Chevrolet Silverado

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The transmission is not shifting properly. When starting from a stop I have to let off of the gas to allow it to up shift. At highway speed (55 -75mph) the transmission does not remain in 4th (over drive). It will shift freely into 4th but when I give it any gas - including gas to maintain the speed - it easily down shifts to 3rd.

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  • Chevrolet Master
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Look for a vac hose leak, test the modulator.

Posted on Aug 31, 2010

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My 1995 buick lesabre electronic transmission- it shifts at the wrong speeds and sometimes will not shift into high gear on the highway, but sometimes it will work. and sometimes it loses gear on th


First off, have you changed your trans fluid lately. sounds like you need a trans flush. when you drop the trans pan and replace the filter and fluid you only get 3 to 4 quarts of transfluid. your trans holdt 12 to 15 quarts. so have it flushed completely cost $80 tp $120 but beats buying a new or rebuilt trans. always make sure you have the right amount of trans fluid. underfilling will cause lose of pressure and not shift properly. over filling a trans will cause over pressure and cause worse problems.

Apr 05, 2014 | 1995 Buick LeSabre

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When putting car in R or D car dies


fuel issue possibly MAP sensor or tps sensor? any check engine light?? transmission not shifting??

Feb 18, 2014 | Chrysler Voyager Cars & Trucks

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When putting car in reverse or drive car dies


sounds like your automatic transmission is stuffed, take it to a mechanic for a second opinion but it seems to me like you'll need to either rebuild or replace the transmission

Feb 18, 2014 | Chrysler Voyager Cars & Trucks

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I have a 1996 f250 7.3 diesel. Transmission shifts when accelerating fast or slow. When truck is first started and it gets on the highway it doest want to shift into the last gear. I have to accelerate to...


it indicates a problem over drive solenoid/servo or TCM problem
take it to an accredited specialist transmission shop and have the fault codes read

Jun 24, 2017 | Cars & Trucks

1 Answer

My 1999 Chevy Silverado 1500 Z71 makes a clunking noise and feels like it got rear ended if I drive it for an hour or so non stop. It seems to be when it shifts from 1st to 2nd gear. I had the ******...


No one can tell you what it is.This is the operating characteristic of your transmission and customer do object to the noise or clunk and dealer discourage the repair. This is TSB 03-07-29-004G. Let me give you a partial copy. INFORMATION
Bulletin No.: 03-07-29-004G
Date: December 15, 2010
Subject: Manual Transmission Operating Characteristics
Cold Operation
Manual transmission operation will be affected by temperature because the transmission fluid will be thicker when cold. The thicker fluid will increase the amount of force needed to shift the transmission when cold. The likelihood of gear clash will also increase due to the greater time needed for the synchronizer assembly to perform its function. Therefore when the transmission is cold, or before it has reached operating temperature, quick, hard shifts should be avoided to prevent damage to the transmission.
Backlash
Backlash noise is created when changing engine or driveline loading. This can occur when accelerating from a stop, coming to a stop, or applying and releasing the throttle (loading and unloading the driveline). This will vary based on vehicle type, build variations, driver input, vehicle loading, etc. and is created from the necessary clearance between all of the mating gears in the transmission, axle(s) and transfer case (if equipped).
Shift Effort
Shift effort will vary among different style transmissions and synchronizer designs. Usually the more heavy duty the transmission, the higher the shift effort because of the increased mass of the components. Shift effort can also be higher in cold weather because the fluid will be thicker. Medium duty transmissions will not shift as quickly as a Corvette transmission. To reduce shift effort, do not attempt to rush the shift - allow the synchronizers to work as designed. Shifting harder will only increase the chance of rushing past the synchronizer leading to grinding while shifting.
Non-Synchronized Gears
Some light duty truck transmissions in 1st gear (creeper-gear) and reverse gears in various transmissions, along with all gears in some medium duty transmissions, may be non-synchronized. This means there is not a mechanism to match input and output shaft speeds to allow for a smooth shift. This function is left up to the driver. This can be noticed if a shift into 1st or reverse is attempted while the vehicle is rolling or before the input shaft stops rotating leading to a gear grind. The grinding can be reduced by coming to a complete stop and pausing for a moment before shifting into the 1st or reverse gear. Some slight grinding can be expected. In medium duty non-synchronized transmissions, the driver must match input shaft (engine) speed to output shaft (driveshaft) speed with every shift. This can be accomplished by double clutching, or by using other methods. If the driver is not able to perform this function properly, there will be gear grinding with each improperly completed shift. Driver training may be required to correct this condition. Clutch brakes are used in medium duty non-synchronized transmissions to allow a shift into gear at a stop. The clutch brake is used to stop the input shaft from spinning, allowing a shift into gear at a stop without grinding. The clutch brake is activated by pressing the clutch pedal all the way to the floor. When the clutch brake is used, it is possible to have a blocked shift with the vehicle stationary. If this occurs, engage the clutch slightly to rotate the input gear to allow the shift. The clutch brake is intended to only be used while at a stop. Care must be taken to not activate the clutch brake while shifting between gears. This could lead to excessive grinding or a blocked or missed shift.

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What is the o/d button on top of automatic gear stick for please


Over Drive..... Generally speaking, overdrive (OD) is the highest gear in the transmission. Overdrive allows the engine to operate at a lower rpm for a given road speed. This allows the vehicle to achieve better fuel efficiency, and often quieter operation on the highway. When it is switched on, an automatic transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [43+ mph] depending on the load). When it is off, the automatic transmission shifting is limited to the lower gears. For an automatic transmission, it is almost always best to select overdrive and allow the transmission to control engagement of the overdrive. (It may be necessary to switch it off if the vehicle is being operated in a mountainous area or when towing a trailer.) With a manual transmission, overdrive should usually be selected when the average speed is above 70 km/h (approx. 43 mph).

Feb 08, 2011 | 2003 Honda CR-V

1 Answer

My 1999 Hyundai sonata,won't go above 55 miles.


I have the same problem..but mine has a hard time getting up to 55 ..it also does the hard shift thing and will not excelerate going up any kind of hill.I've already replaced the input..output speed censor's and had a tune up...it has about 116,500 miles on it and i dont know if its the transmission causing the problems.

Jan 31, 2010 | 1999 Hyundai Sonata

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Car struggles to get into first gear after it has warmed up.


You probably have a problem with your CV joints. There is a device that helps in the shifting of gears that needs looking at. I assume it shifts to the other gears when it is warm ? How many miles do you have and are most of the miles on the highway? I hope this isn't leading to a transmission breakdown. Have you had the transmission serviced regularly and filter changed?

Feb 20, 2009 | 1997 Honda Civic

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