Is the 700R4 a computer controlled transmission?
If you want to learn more about the differences is the 2004R vs 700R4, just check that article out. While it is not computer controlled, it does use a TV Cable, which acts like a throttle position sensor to control when and how hard it shifts. Most people concede that the first 5 or so years the transmission was pretty weak.
Where can I buy a rebuilt 700R4?
A great place to look is EBay. You should reasonably expect to find a rebuilt 700R4 with the TV cable, a torque converter, and rebuilt insides for right around $600. You can find one that can handle at least 500 horsepower for right around the $1000 price point. Amazon is another great place to look.
How does the ECM work on a 700R4?
The 700R4, on the other hand is told when to shift by the aforementioned “TV cable”. This cable hooks directly to the carburetor or throttle body. The ECM is a tremendous improvement over the TV Cable, which itself is a tremendous improvement over the kick down and vacuum modulator found on a TH350.
Does the 700R4 have a locking torque converter?
The 700R4 uses a locking converter which is not interchangeable. By locking the torque converter it makes a direct connection between the engine and transmission much in the same way that a manual transmission would going down the highway. You can look forward to roughly 30% better fuel economy. You will need to hook up the converter lock wiring.
Does a 700R4 transmission have a vacuum line?
Like stated above there are no vacuum lines on a 700R4. They do however have a switch for the lock up converter.
Where is the transmission vacuum modulator located?
0:253:26Vacuum Modulator Installation GM TH350/TH400 TransmissionYouTubeStart of suggested clipEnd of suggested clipStarting from the passenger side you're going to step under the vehicle. And you were going to findMoreStarting from the passenger side you're going to step under the vehicle. And you were going to find on the transmission. That is the vacuum modulator.
What controls a 700R4 transmission?
Electronic Controls The 700R4, after being renamed to the 4L60, featured electronic controls that replaced its hydraulic shifting system. This electronic control came with Vehicle Speed Sensor that alerted the engine's computer of the speed at which the car is moving and when it was time to switch gears.
What are symptoms of a leaking vacuum modulator?
When you have a bad modulator valve, some or all of the following symptoms will begin to manifest themselves:A whistling sound (from a leaking diaphragm)White smoke coming out of the exhaust (from a leaking diaphragm)Early or late shifting.Hard shifts (usually causing the car to jerk)A rough idle.More items...
What happens when a vacuum modulator goes bad?
Engine performance issues If the EGR vacuum modulator diaphragm tears or leaks it will disable the EGR system and may cause a vacuum leak. An excessively large vacuum leak can result in engine performance issues such as a decrease in power, acceleration, and fuel economy.
Can a vacuum leak cause a transmission not to shift properly?
A vacuum leak will cause the engine performance to suffer, causing load and throttle position issues which could affect transmission shifting.
Can you run a 700R4 without a computer?
To run a 700-R4 trans behind a carbureted engine without a computer, at the very least the TV cable must be hooked up to the carburetor and properly adjusted. Not just a simple kickdown cable like your TH350 analogue, the TV cable controls line pressure and shift points.
Will a 700R4 work without being plugged in?
1:142:19Does your 700R4 needs a computer? - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo but once again 700r4. Does not need any voltage any computer it shifts on its own off TV cableMoreSo but once again 700r4. Does not need any voltage any computer it shifts on its own off TV cable pressure any other questions give us a call or email us at WWF dog transmissions comm.
Does a 700R4 have a lockup converter?
The GM 700-R4 & 200-4R transmissions utilize a lock up converter to help create a more efficient transmission.
How do you test a vacuum modulator?
5:488:36How to test Toyota EGR System(VSV, Vacuum Modulator, EGR valve)YouTubeStart of suggested clipEnd of suggested clipAnd to test that what you need to do is tap in with the T fitting. And a vacuum line to the outputMoreAnd to test that what you need to do is tap in with the T fitting. And a vacuum line to the output of the vacuum modulator or port Q.
What happens if you drive with a vacuum leak?
At its worst, long-term driving with a vacuum leak, elevated temperatures generated by running a lean air-fuel ratio could result in engine damage. Lean mixtures can detonate, damaging pistons and bearings. Higher than normal exhaust temperatures can also lead to catalytic converter meltdown.
What does vacuum modulator do in automatic transmission?
The vacuum modulator is a vital component of automatic transmissions. It tells the transmission what kind of load is being put on it, allowing the transmission to react with the proper line pressures and shift points.
How much does a 700R4 cost?
You should reasonably expect to find a rebuilt 700R4 with the TV cable, a torque converter, and rebuilt insides for right around $600. You can find one that can handle at least 500 horsepower for right around the $1000 price point. Amazon is another great place to look.
Why is the 700R4 so good?
The reason for this is because it works with the engines computer in tandem with the engine to provide consistent shifting that is well suited to any speed and throttle load situation. The 700R4, on the other hand is told when to shift by the aforementioned “TV cable”.
How far back is the transmission mount on a 700R4?
Most of the time you’ll have to have the driveshaft shortened. The transmission mount location on the 700R4 is also a few inches further back (21.25” vs 19.5” with the TH350) so a new crossmember or some fabrication will be required. The TH350 uses a kick down cable.
How far is the 700R4 from the bell housing?
You will need to do just a few things. The 700R4 is 24” from bell housing to tail shaft with a 6” tail shaft. The TH350 is 22 1/4 “ from the bell housing to the tail shaft, with 3” 6” and 9” tail shafts available. Most of the time you’ll have to have the driveshaft shortened. The transmission mount location on the 700R4 is also a few inches further ...
How many quarts does a 700R4 hold?
The thing with fluid capacity is that it is not constant for every application. But as a rule the 700r4 holds about 11 Quarts. If it is a high capacity version it could hold up to 12 quarts, and if it has a transmission cooler attached that’s good for at least another quart.
What is a TH700R4 transmission?
The TH700R4 transmission was designed to replace the TH350 transmission. It is a GM automatic transmission designed for rear wheel drive vehicles. GM was feeling the pressure to produce more fuel efficient cars from both the government and consumers, the latter were just starting to discover the reliability and fuel savings ...
Is 700R4 transmission more expensive?
It’s more expensive, but if you can it’s great to have a transmission that you know is going to stand the test of time. No matter where you decide to get a 700R4 Transmission from, the more research you do the more money you will save. Privacy Policy.
What is 700R4 transmission?
The 700r4 transmission is a widespread transmission on GM/Chevy cars, used in millions of cars for decades. In this article, you will find everything you have to know about the 700r4 transmission. We will begin with the specifications of this transmission.
What transmission is used on a 700R4?
Well, the 700r4 uses a TV cable as the speedometer, and the 4L60 is an electronically controlled transmission, so if you see wires coming to the transmission on the rear of the transmission on the passenger side, you have a 4L60. 2. Identification Tag.
Why won't my 700R4 lock?
However, the first thing you should always do when your transmission is slipping is to replace the transmission fluid and flush it.
How to tell if a 700R4 transmission is a 4L60?
The 700r4 and the 4L60 transmission uses a bolt pattern of 16 bolts , so if the transmission looks like one of the pictures above and you can see 16 bolts, you most likely have a 700r4 or a 4L60 transmission.
How to troubleshoot a 700R4 transmission?
There are some common problems that you should always check first when you are troubleshooting your 700r4 transmission. 1. The switch at the brake pedal. There is a switch on the brake pedal , which you should check the function to make sure it works correctly.
When did the 700R4 come out?
The 700r4 Transmission came in the year 1982. The 700r4 and the 200-R4 transmission replaced the TH350 transmission in that year. The TH350 was a 3 geared transmission without the last overdrive gear. The 700r4 was a big upgrade with an additional gear (Overdrive), the 1st and 2nd gear became longer, and the transmission case itself became ...
What to do if your car revs up but it won't move?
If your car revs up, but it will barely move, you should start by checking the transmission fluid, as discussed before. Check the level and the color of the transmission fluid.