tv cable adjustments

Re: tv cable adjustments

Postby grumpyvette » December 2nd, 2008, 8:35 pm
LS1MCSS posted this
If you are going to use a 200-4R or a 700R4, you will run into the same problem I did. A bracket for the throttle cable and TV cable has to be hand made if you run an aftermarket intake and 90MM throttle body. It took me about three hours to get this built the way I wanted it, but it will work good and the TV cable hookup has the correct geometry.

youll probably need to fabricate something custom similar to this, maybe the links/info will help

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Re: tv cable adjustments

Postby grumpyvette » February 16th, 2009, 9:09 am


viewtopic.php?f=33&t=616 ... 0R4p1.html




00 - 4R Transmission


"Advisory Tip Sheet"

This information is provided for the non-transmission mechanic to help them identify the problem, know how much the job should cost and how to have the problem corrected. This information could save you hundreds even a thousand dollars or more.

This transmission has been in use since 1981. It is the overdrive version of the 200-C transmission. This means there are plenty of used, rebuilt and new hard parts available at low prices. The cost of a rebuilt 200-4R transmission and torque converter installed in a car at our shop is $1070.00 as of July 2007. This comes with a 6 month or 6,000 mile warranty. We charge $100.00 extra for a 12 month 12,000 local warranty. The only part that should be extra is the transmission case, if it's bad. The cost may be higher in your area.

Never allow a repair shop to give you a price on this transmission that isn't a guaranteed price. This means don't get a price plus hard parts. They know about what the parts will cost. Remember the parts aren't high on this transmission. Get the price before the transmission is removed from the car. If they can't give you a price up front, you're at the wrong shop.

As a general rule the better the warranty, the higher the price. Most shops have a local warranty, meaning they do their own warranty work. You will pay alot more for a nation wide warranty.

When you have a problem with your transmission always check the fluid level and condition first. The fluid should be red, not dark brown or black. Smell the fluid to see if it smells like oil or has a burnt smell.

Look in the oil pan for trash (debris) from a clutch or metal part failure. A very small amount of debris could be normal. If the fluid is black, smells burnt or has a large amount of debris in it, you've got a problem. The transmission will have to be removed and rebuilt. Always install a new torque converter when the transmission is rebuilt. Never try to save money by reusing a torque converter that is full of debris from a failed transmission. The 200-4R converter also has a clutch in it that could be bad.

Don't tow a trailer that is too heavy for your car.

Never use a transmission additive that says it will stop leaks. This will turn your seals to mush over a period of time. If you have a problem with the front seal, installing a new seal is a waste of time and money, it will only leak or blow off again. You must install a new seal, torque converter and rebuild the pump all at the same time to correct this front seal leak. This should cost about $305.00 plus tax.

Change your fluid and filter about every 20,000 miles. This is a preventive measure, not a fix for a problem.

If your 200-4R transmission has high mileage, don't try to do a patch job, if you develop a problem have it rebuilt. Over 100,000 miles is high mileage.

Some problems that can be mistaken as a transmission problem are motor mounts, fuel filter, spark plug wires, catalytic converter, fan clutch, U-joints and others. Never rebuild your transmission without an expert diagnosis first. When it's done, you may still have the same problem.

Look to see if the throttle valve cable (passing gear cable) is connected to the carburetor or throttle body in the case of fuel injection. The cable must be hooked up and adjusted correctly at all times, because this controls the pressure. When you step on the gas pedal the throttle valve cable turns the transmission pressure up. This is how to make the adjustment on the cable. With the throttle wide open, the cable must be fully pulled out at the exact same time. The adjustment is made at the bracket. You must push a button in or pull a button out to move the cable housing forward or rearward. Moving the cable housing to the rear raises the pressure. Be careful, if you adjust the pressure too low you could burn the clutches.

If your transmission doesn't shift out of first gear or shifts hard at too high a RPM this doesn't always mean you have a problem. This could be a stuck throttle valve caused by a small piece of trash. This sometimes happens after a rebuild. Sometimes the throttle valve can be unstuck without removing the valve body. Get up to about 20 to 30 M.P.H. and hit the gas pedal on and off hard with your foot. This might do the job. If that doesn't work remove the throttle valve cable end from the throttle, with the motor at idle in park, pull the cable in and out very fast, this might work, if not the valve body must be removed by a transmission shop to be unstuck. This could cost $50.00 to $100.00.

If you don't have a lot of experience installing transmissions, don't buy the transmission from a re-builder and install it yourself. If a shop rebuilds and installs your transmission, they will only charge you one installation fee, regardless of how many times they have to take it back out. If you do the job, it's your problem if the transmission is defective.

SUBJECT: Proper installation of the throttle valve cable on after-market carburetors or fuel injections. This information applies to all 700R4, 4L60 and 200-4R transmissions. Throttle valve cable adjustment instructions, numbers 4, 5 and 6.

#1. The button that the cable hooks to at the carburetor or throttle body must have a 1 and 3/32-inch radius from the center of the throttle shaft to the center of the button the cable hooks to.

#2. Looking at the throttle shaft lever from the left side at idle position, 33% of the throttle lever total travel must be to the rear of the throttle shaft centerline. And at wide-open throttle, 67% to the front of the throttle shaft centerline. This will be about 1/2-inch to the rear and 1 inch to the front of the throttle shaft centerline.

#3. The throttle valve cable must be hooked up in this manner so the pressure will rise faster off idle and slow down at heavy throttle. If the pressure cable is pulled in a more even manner the pressure will be too low at light throttle. Failure to hook-up the throttle cable in this way will burn the three-four clutch pack up fast.

#4. The throttle valve cable controls transmission pressure. Adjusting this cable is the most important step when installing a 700R4, 4L60 or 200-4R transmission.

#5. The final step is to adjust the throttle valve cable. The cable must be adjusted so it is pulled fully out at wide-open throttle. To make sure disconnect the cable, hold the throttle wide open with your left hand, pull the cable fully out with your right hand and see if the cable end lines up with the button on the throttle lever.

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#6. Do not attempt to adjust the shift timing with the throttle valve cable. The shift timing is controlled by the governor springs. For higher shift points at wide-open throttle, install lighter springs. For lower shift points at wide-open throttle, install stronger springs.

#7. You can get a cable button off of a junk GM vehicle and weld it to your throttle valve lever. We sell a cable correction kit for Holly and Edelbrock carburetors.

#8. Sometimes on a newly rebuilt 700R4 or 200-4R transmission, it may not make the 3-4 shift when first installed. A stuck valve, trash in the fluid or an air pocket, usually causes this. Raise the rear wheels off the ground, place the transmission in overdrive position. Run the speedometer as high as 100 miles per hour, pop the throttle on and off and see if you can force a 3-4 shift. Once it makes the first 3-4 shift, work the shift lever back and forth between drive and overdrive until the 3-4 shift works correctly.

#9. If you have a Holley or Edelbrock carburetor, you must install an adapter on the carburetor linkage for the transmission to work correctly.

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Re: tv cable adjustments

Postby grumpyvette » February 11th, 2012, 10:35 am

T.V. Cable Adjustment



The TV cable on the 700R4 and 200-4R transmissions controls line pressure, shift points, shift feel, part throttle downshifts, and detent (full throttle) downshifts. So if the TV cable is not adjusted properly, it can cause numerous transmission problems.

The TV cable is connected to and operates the throttle lever, and bracket assembly mounted on the valve body. The function of the throttle lever and bracket assembly I to transfer the movements of the throttle plate in the carburetor to the TV plunger in the valve body. This causes TV pressure and line pressure to increase according to throttle opening and also controls modulated and detent downshifts. The proper adjustment of the TV cable is based on the TV plunger being fully depressed with the engine at wide-open throttle (see figure 9). When the TV cable is properly adjusted the movement of the TV plunger in the valve body is calibrated to the movement of the fuel delivery system. This means the transmission will always have the correct oil pressure and shift feel regardless of engine torque. Simply put, due to this calibration, engine torque and transmission line pressure/shift feel will always be in balance.

If a change is made, such as a different carburetor installed, the change in geometry could disrupt this balance and proper adjustment may never be achieved.

Many people try to defeat the self-adjusting TV cable and tailor shift points of shift feel. However, remember that on the 700R4 and 2004R Transmission the TV cable controls both shift feel (clutch apply pressure) and shift points, you therefore cannot alter one without altering the other.

Let's discuss briefly what happens when someone tailors the TV cable:

Shortening the Cable : If you shorten the cable (move it towards the adjuster tab), this raises both one pressure and shift point. However, when the drive performs a full throttle downshift the TV cable will readjust to its approximate normal position.

Lengthening the Cable : If you lengthen the valve, this lowers both line pressure and shift points. Under this condition, the TV cable will not readjust during a full throttle downshift. What you have effectively done is allowed the engine torque to be ahead of transmission line pressure and shift points. Operating the vehicle under this condition will cause premature clutch wear and transmission malfunction.


A TV cable that is sticky; misadjusted, broken or incorrect for the vehicle can cause various transmission malfunctions. A sticky or binding TV cable can result in delayed or full throttle upshifts (figure 9). At other times, the TV cable may stick or bind only when the engine off. To check for this problem, run the engine at idle with the transmission selector in neutral and the parking brake set. Pull the end of the TV cable located on the throttle linkage, through its full range of travel, then release it. It should return to rest against the cable terminal (figure 10), it may be caused by one or more of the following conditions:

1. A sharply bent or damaged TV cable hosing. To correct this problem, try rerouting the cable. If this doesn't cure the problem, replace the cable.

2. A burr or sharp end on the TV link. This condition would cause the link to drag in the TV cable housing. You can correct this situation by filing the end smooth but Do Not shorten the link.

3. Misalignment of the throttle lever and bracket assembly on the valve body. Correct the alignment and torque the bolts to the proper specifications as noted in your service manual.

4. A bent TV link. Straighten or replace the link as required.

5. A binding or damaged throttle lever and bracket assembly. Straighten or replace the assembly as required.

6. An unhooked or damaged throttle lever spring. Reconnect the spring if it is unhooked. If it is damaged, replace the throttle lever and bracket assembly.

7. An incorrectly adjusted TV cable. (A) If the cable is adjusted too long, one of the following conditions may result: (1) early shifts, slipping, and/or no detent downshifts; (2) low line pressure. (B) If the cable is adjusted shore, or not hooked up at all, line pressure and shift points will rise and full throttle operation may not be possible.


Before adjusting the TV cable, check the following:
1. Transmission oil level. Correct if necessary.
2. Proper engine operation. This can cause problems similar to a malfunctioning transmission.
3. Dragging brakes. This can cause detract from vehicle performance and cause transmission malfunction.
4. Check the TV cable to insure that it is the right part for the vehicle. If you do not hear at least one "click" from the TV cable during the adjustment procedure, it may be the wrong part.
5. Check the cable to insure that it is properly connected at the transmission. "Clicks" will still be heard during adjustment.Adjustment procedure (self-adjusting cable)1. Stop the engine.

Adjustment procedure (self-adjusting cable)

1. Stop the engine.
2. Depress the adjusting tab and move the slider back through the fitting away from the carburetor until it stops.
3. Release the adjustment tab.
4. Move the throttle linkage to rest against the full throttle stop, then release it .
5. Check the cable to insure that it is not sticking or binding.
6. Road test the vehicle.
7. If the problem still exists, refer to the cable diagnosis section.




This section is only for those that do not have a previous TV cable setup, or for those who's TV cable will not fit into the specifications in the previous pages.

Proper installation and adjustment of the TV cable is the most important aspect of a transmission. Don't think of it as "just a kick-down cable" - on the nonvacuum-modulated Th700R4 and Th2004R the TV cable controls line pressure, shift points, shift feel, part-throttle downshifts, and detent downshifts! As the accelerator pedal is depressed and the throttle opens, the TV linkage relays the motion to the valve body's throttle plunger. In stock installations, the geometric relationship between the TV cable and carb throttle shaft bellcrank produces the required TV cable extension (pull) for the transmission to function properly under different degrees of throttle opening. Failure to preserve the correct geometric relationship in custom installations will inevitably lead to early transmission failure.

1. Measure your TV cable to establish its particular mounting dimension as follows: First retract the slider by depressing the lock tab, then pull the cable housing until the flats on the slider are flush with the end of the adjuster housing. (To illustrate components in this photo the slider is shown extended, and the lock tab is not fully inserted through the bracket face.)

2. Then, with the slider retracted, fully extend the cable by pulling the cable end fitting out until it stops. Holding the end fitting out, measure the dimension from the face on the adjuster housing that registers with the mounting bracket to the center of the cable and connector.

3. Add 1/16 inch (.19) to the measurement obtained in step 2 - this is the perpendicular measurement from the rear face of the TV cable mounting bracket to the wide-open-throttle position of the TV cable connector pin on the throttle bellcrank.

4. To ensure that the TV mechanism moves in correct proportion to the throttle opening, the TV cable bellcrank must be perpendicular (90 degrees) to the TV cable when the throttle is about a quarter open. The cable connector pin's mounting location must be established on the throttle bellcrank at a radius of 1.094 to 1,125 inches (also see step 3). If there is no suitable existing hole in the bellcrank, drill a new hole or fabricate a suitable attachment, as required, to properly locate the connector pin.

5. The proper location of the TV cable mounting bracket is determined by the angular and radial position of the TV cable connector pin on the throttle bellcrank. Make sure that other cables and rods will not interfere with the TV cable. Mount the TV cable adjuster housing so that the lock tab is readily accessible.

6. Fabricate the bracket using .090- to .125-inch sheet metal to these housing cutout dimensions. If thicker stock is used, a chamfer is required on two sides of the cable mounting cutout to allow the lock tabs to expand properly. The adjuster requires approximately 18 pounds pull to ratchet out, so make the bracket as rigid as possible.
Holley 20-97 Transmission Cable Bracket Steel Chrome Holley TBI 700R4

Holley 20-121 Kickdown Throttle Bracket for 700R-4

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