700r4 Troubleshooting Guide
- Torque Converter won’t lock and slipping. When your 700r4 transmission is slipping or won’t lock, it’s most likely a problem with the converter inside the transmission.
- Revs up but won’t move. If your car revs up, but it will barely move, you should start by checking the transmission fluid, as discussed before.
- The speedometer is not working properly. ...
Full Answer
Why does my 700R4 transmission feel like it's slipping?
With the 700R4 transmission specifically, it is possible that the transmission is fine yet still slipping. Or at least it gives the feeling of slipping. A TV cable that is out of adjustment can give a very similar feeling. If it is out of adjustment the shift pressure will be down and may be hindering the ability for the transmission to shift.
What are the problems with a Ford 700R4?
If your 700r4 is having a problem with harsh vibration going down the road, it’s more than likely loose torque converter bolts, or a driveshaft that needs balancing. 700R4 won’t shift. This is often a sign of a bad governor gear, or a TV cable that is not returning back when you let off of the throttle.
Will a 700R4 shift into 3rd?
The TH (turbo-hydramatic) 700R4 was developed for use after 1982 in GMC and Chevrolet cars and trucks. will not shift into 3rd just slips. I installed a 700r4 in my 60 chevy. It only shifts 1st to 2nd it slips when it goes to 3rd. does this have any thing to do with the TV cable not being conected?
Why does my 700R4 vibrate when I drive?
If your 700r4 is having a problem with harsh vibration going down the road, it’s more than likely loose torque converter bolts, or a driveshaft that needs balancing. This is often a sign of a bad governor gear, or a TV cable that is not returning back when you let off of the throttle. Here is a pretty good resource on this subject.
How do I get my transmission to stop slipping?
The easiest way to prevent transmission from slipping is to change the transmission fluid and filter often or after your specific car model's specified schedule. Check the fluid level once a month and repair any leaks from the transmission to prevent a low transmission fluid level.
Why is my transmission slipping all of a sudden?
Transmission gears wear out and start slipping. Slipping gears are usually due to normal wear and tear, which causes them to not engage properly and to slip in and out of sync. It is rare, but there might be a malfunctioning set of gears in the transmission, which is usually due to bad original manufacturing.
Can slipping transmission Be Fixed?
How to Prevent Transmission Slips. If your transmission problem isn't due to worn out bands or fluid leaks, then you either need to replace the clutch, the worn out gears, the solenoids or the torque converter. Any of these is a costly repair which is best performed by a mechanic with little you can do about it.
What sensor can cause a transmission to slip?
Transmission Input Speed Sensor This is because the torque converter, which is a fluid drive, allows this effect, which is perceived as 'slipping'. When the input shaft moves, the input speed sensor detects this motion, and wires deliver this signal to the control module.
Can too much transmission fluid cause slipping?
Excess transmission fluid can cause several adverse effects on the transmission. If the fluid stays above the recommended level, it can cause it to start mixing with air. This can lead to gear slippage, hard shifting, and other transmission shifting issues.
What are the signs of a torque converter going out?
6 Signs of a Failing Torque ConverterLoss of Acceleration. ... Slipping Between Gears. ... Vehicle Won't Shift at All. ... Transmission is Overheating. ... Transmission Fluid Leak. ... Bad Transmission Fluid.
Can a dirty transmission filter cause slipping?
When the transmission fluid isn't clean or is blocked by a clogged filter, the internal components won't have the lubrication they require to function properly. This could lead to shifting issues, grinding gears, slipping transmission or other common symptoms of transmission problems.
Why does my transmission slip after fluid change?
If the valve body gets all gunked up with transmission fluid that's damaged, the driver could lose the ability to shift between gears. And that's why so many people believe that changing old transmission fluid can cause it to slip.
How is transmission slipping diagnosed?
The following symptoms are generally symptomatic of a slipping transmission:Delay in acceleration.Burnt or other unusual smells.Excessively high RPM, over 3,500.Trouble shifting gears.Harsh response any time you are able to shift gears.Check engine light constantly turning on.Strange noises coming from the transmission.
What happens if your transmission loses pressure?
the lack of pressure created by the faulty pump causes the transmission clutches and bands to slip and burn. this often results in debris contamination and subsequent damage to the transmission. faulty valve body: the valve body directs fluid to internal transmission components.
What causes a transmission to lose pressure?
The fluid is either too low or very dirty. Dirty fluid can cause all kinds of shifting issues because it clogs up small passageways going to the shift solenoids. If the fluid level is low, there's not enough fluid to fill all these passages, and the transmission lacks pressure internally.
How do you know if your transmission range sensor is bad?
The Transmission Range Sensor tells the PCM the position of the transmission shifter....Symptoms of a bad transmission range sensor:The car doesn't start and will not move.Transmission shifts into an unexpected gear.The vehicle will go into limp mode.
What is a 700R4 transmission?
The 700R4 is still a mechanically controlled transmission (with the exception of the locking converter circuit mentioned above), and depends physical pressure sensors and a sort of throttle position sensor to get it’s throttle position right. This throttle position sensor is called the “TV Cable” This cable acts like the kick down switch would on a TH350 in that it’s physical, but lets the transmission know exactly where the throttle position is like a 4L60E. If you think that your TV cable may be going out, you can pick one up on Amazon for under thirty bucks here: http://amzn.to/2kTO8lF
How long has the 700R4 been in production?
It’s been over 20 years since the 700R4 made it into a production vehicle. While they have been fairly reliable over the years, we have written this guide specifically to help with troubleshooting your 700R4 transmission. When it comes to doing any sort of troubleshooting on a vehicle I think it is incredibly important to work from a most likely ...
What transmissions have locking torque converters?
The 700R4 and 2004R were the first GM automatic transmission to come from the factory with a locking torque converter. This allowed for a true 1:1 connection between the engine and rear wheels at high speed, which increased fuel economy. If you feel that th e engine seems like it is turning faster than it should be while going down the highway, than you could have an issue with torque converter refusing to lock up
What does it mean when a wiring harness plugs into something back there?
If there is a wiring harness that plugs into something back there, you have a VSS. You’ll need to determine if the wiring is getting voltage. If it is you’ll need to replace the VSS on the tail shaft, or the speedometer itself. Of course, you could get lucky and it’ll just be a wiring issue.
How to know if you have a speedometer?
The first thing you’ll need to know is which type of speed sensor you have. If you can safely get under the car and take a look around the tail-shaft. If the cable coming out of it is thick with a big circle that screws into it, you have a mechanical speedometer.
Does a cruise control switch work with a torque converter?
Most of the time the cruise control switch will do double duty with the torque converter lockup switch, so using process of elimination above that should get you to the part you need. Now you may want to make sure that the circuit is getting voltage. You can do that with a test light.
What causes a 3-4 clutch to slip?
The accumulator is a piston with a sealing ring around it. If the sealing ring fails, apply pressure to the clutch will bleed off and the clutch will slip and burn. If the 2nd gear band servo doesn't release quickly enough when 3rd gear applies, the 3-4 clutch pack will burn up. If the trans oil pump doesn't produce sufficient pressure, the clutches will slip and burn. The input shaft is also a conduit for oil pressure from the pump to the various clutches. Sealing rings are used to isolate the circuits from each other. If these sealing rings leak. Pressure will bleed between circuits and cause clutches to slip and burn.
When was the 700R4 made?
The TH (turbo-hydramatic) 700R4 was developed for use after 1982 in GMC and Chevrolet cars and trucks.
How to adjust throttle body?
Adjustment is easily done once the cable is properly installed, press in on the side of the adjuster body (a button like thing, its metal) on the throttle end and push the adjuster all the way into the adjuster body. Release the "button" and slowly open the throttle completely by hand, it will be a bit tight doing so. The adjuster will come out of the adjuster body to the proper distance, and you're all set.
Why is my 3rd accumulator not slipping?
It should not cause slipping in 3rd. Most likely cause of this problem is damaged 3-4 clutches. It could also be a rolled or cut 3-4 piston lip seal or a cut or damaged sealing ring on the turbine shaft. It is also possible that the 3rd accumulator checkball is not sealing.
How to check a 700R4 governor?
You can pull the cover with large channel locks. I use a pair of dust cover pliers that remove the cover without damaging it. With the cover off, the governor pulls straight out. Look for the plastic gear to be stripped. If the gov gear is okay, check the valve for sticking. If the governor checks out, you will need to remove the pan and valve body to check for a stuck valve or valves . The first thing I would check would be the 1-2 shift valve train, next would be the modulated up shift valve.
What is the 3rd gear accumulator?
The accumulator is a piston with a sealing ring around it.
What happens if the sealing ring fails?
If the sealing ring fails, apply pressure to the clutch will bleed off and the clutch will slip and burn. If the 2nd gear band servo doesn't release quickly enough when 3rd gear applies, the 3-4 clutch pack will burn up. If the trans oil pump doesn't produce sufficient pressure, the clutches will slip and burn.
Why does my transmission keep slipping?
Low transmission fluid is probably the most common cause of why your transmission is slipping and probably also the easiest to fix. When the fluid level drops, the pressure required to engage the gears properly is reduced. This causes a strain during shifting, which causes it to start slipping and then overheating the transmission fluid.
How to fix a slipping transmission?
The first step you should take to fix your slipping transmission is to check the transmission fluid level and carefully inspect the condition. If the fluid level is low, but the color seems fine, you should first try to fill it up. If it is brown, you want to consider changing the fluid and the filter. If the fluid is black and smells burnt, you ...
What causes transmission fluid to slip?
Transmission slipping can also be caused by burnt transmission fluid. The burnt fluid smells like burnt toast and has an abnormally dark color. If the transmission fluid burns, it becomes ineffective.
Why does my transmission fluid burn?
Burnt transmission fluid occurs when your transmission is overheating, but it can also be a mix of very old transmission fluid combined with high fluid temperature. Worn parts can also cause black transmission fluid in the transmission that needs to be changed.
Why does my torque converter slip?
The most common problem with the torque converter is that it fails to build pressure to transfer the torque properly and it will therefore cause a slipping transmission.
How to check transmission fluid level?
Checking the transmission fluid is often super easy by just looking at the dipstick in the engine bay or check your service manual on how to check the transmission fluid level. Remember that the transmission system is a sealed system, and the transmission fluid should not disappear if it isn’t leaking.
How to tell if transmission is slipping?
Check Engine Light or Transmission light. Burnt smells. The most common sign when a transmission is slipping is that your engine RPM speed will not match up with the vehicle’s speed. If you owned your car for a while, you have probably learned how your engine behaves and when your transmission should shift ...