Transmission Engine Mount

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Transmission Engine Mount
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Changing C.V. (Constant Velocity) axles today is almost as common as doing brake jobs. But some CV axles can be pretty stubborn to remove. In this article learn some of the tricks I've used over the years as a Master Tech to make changing CVs and 1/2 shafts easier. Automotive specialty tools are sometimes needed to make the job easier, I'll discuss some of those and if it is better to replace the entire half shaft, the joint or just the CV boot.

Clicking On Turns

Since you're reading this you may already know that a common sign of a bad CV joint is popping and clicking on turns. A shudder on straight take offs could be a worn inner joint, but this is much less common. Outer joints have the most movement (like on turns), that's why outer boots usually wear more than the inner ones. CV boots are designed to pump grease throughout the joint during movement. Wear that causes outer joints to make noise can be accelerated if the CV boot breaks from dry rot or wear and the lubricating grease is lost. If the CV boot breaks, grease is thrown out of the joint by centrifugal force while driving. Without grease to keep the joint lubricated and cooler, its life is drastically reduced. Also outside elements like moisture and dirt can enter the joint,  further reducing its life expectancy. Once they wear, they make a clicking noise upon turns while accelerating. If they are noisy, the 1/2 shaft assembly may be the easiest way to go instead of replacing just the joint. CV 1/2 shaft prices have came down in the last decade and are more readily available than they used to be.

Removing the Half Shaft Assembly

The job of removing half shafts on most cars is mostly the same.

1. Remove the big nut that holds the joint to the wheel hub.
2. It may be necessary to unbolt or un-clip the brake hose to prevent stretching it when removing the axle.
3. The steering knuckle (where the brake rotor mounts), must either be loosened at the strut mount or at the lower ball joint to allow the shaft to slip out of the hub. Choose the easiest!
4. The inner CV will either be held into the transmission by bolts or with a retaining clip (the clip is not visible).
5. If there are no bolts on the inner joint, in most cases it will need to be pried out with a pry bar.
6. Alternatively a slide hammer with a C.V. joint puller can be used to remove the inner joint from the transmission. 

Inspecting and Replacing Boots

You may be able to detect and replace worn boots before damage is done to the C.V. joint. If the boot has dry rot and is about to crack or has just recently split . And the CV joint doesn't make any noises yet, it has been caught it in time. The CV half shaft assembly can be removed and just the boot can be replaced with new grease of course. The CV boot kit also comes with two clamps and special grease. It is less expensive to re-boot a joint, but it is a little more labor intensive. On cars that I was familiar with, many times I changed the CV boot without taking the shaft completely out of the car. Usually though, the shaft is removed and placed in a vise to be worked on. The old boot is cut away to help reveal what type of retaining clip is holding the joint onto the 1/2 shaft.

When a cleaner is used, like brake clean and the joint is angled it's easier to see the clip. The joint may need to be turned while kept on an angle to see the clip. Most either require lock ring pliers to spread the lock ring or the joint can be struck sharply with a hammer (care must be taken not to damage the cage). If you have doubt on what type of retainer you are working with, consult a service manual for your specific model. Be aware that the ball bearings can fall out when the joint is off the shaft and the cage is turned sideways depending on the type it is. After cleaning and drying with compressed air, the grease bag can be cut on the corner and the grease is squeezed into the center of the joint. It's common to force out some of the old grease that was trapped while doing this. Scoop up and discard the old grease that may ooze out. Put the boot and joint back on the shaft by spreading the clip or tapping lightly with a brass hammer. Special CV joint boot clamp tools will be needed to tighten the bands properly. There are two basic types of clamps. There is a type that will be crimped with boot clamp pliers. The other type requires a banding tool, this type is wound and cranked tight using the same motion as you would with a can opener.

A common mistake is damaging the output seal in the transmission when removing or re-installing the axle. If the seal is damaged, transmission fluid will leak. Be careful to center the inner joint when putting it back in. Also a mistake that is made even by professionals is to either break the cir-clip that holds the axle in the transmission or to not install the axle completely IN. It is normal to feel a little movement in and out when pushing and pulling the inner joint when it is properly installed. If the retaining clip is broken or not fully inserted, the shaft can slip out enough that the car will not move! Also if tapping the shaft back into the transmission, be careful not to damage the outer threads. Remember if this is your first axle job, don't hesitate to have a buddy with experience on call!

CV Axle Removal Tools - About DenLors Tools

Automotive Transmission Repair Services You May Need for Your Tampa Vehicle

If you are a vehicle owner and you have had to have automotive transmission repair, you know how expensive this can be. Sad to say, automotive transmission repair becomes even more expensive if the vehicle owner does not know much about it and falls prey to unscrupulous auto service mechanics. You should, therefore, find yourself a highly skilled and trustworthy auto service mechanic who can do excellent diagnostic work and car repair, including complicated automotive transmission, engine and brakes repair and simple auto AC repair, while also educating you about the automotive transmission repair services you may need for your Tampa vehicle. This way, you will not find yourself needing the towing services of a tow truck unexpectedly.

There are basically two major types of automotive transmission repair – one that needs the removal of the entire transmission system and one that does not. Minor repairs or adjustments that do not need the removal of the entire transmission system from the vehicle are, of course, less expensive.

In computer controlled transmission systems, problems in shifting may be due to inaccurate signals sent by faulty sensors, a defective solenoid pack or defective connections that interfere with the commands sent by the computer to the transmission system. Such problems are often seen in newer vehicle models that have been manufactured since the Nineties, bearing more modern transmission systems. The repair of such problems does not need the removal of the entire transmission system from the vehicle.

In older models of vehicles that do not have computer controlled transmission systems, shifting problems may point to the need for throttle cable adjustment. The throttle cable is not damaged by the normal wear and tear that the vehicle goes through. Usually, the damage is caused by an accident or even by faulty adjustments done in previous repairs. This is what happens when the vehicle owner tries to cut costs by going to cheap but unreliable auto service shops or mechanics.

Take note that some vehicles have a vacuum modulator instead of a throttle cable. Some vacuum modulators can be repaired by merely adjusting a screw. Of course, your auto service mechanic should first check for any vacuum leaks. Furthermore, your auto service mechanic should check your vehicle's engine since many vehicle problems that seem to be related to the transmission system are sometimes found to be engine related.

Some types of transmission repair involve transmission parts replacements. Some of these can also be done without removing the entire transmission system from the vehicle. Merely removing the oil pan, for example, can already bring access to many control parts and electrical parts. Some auto service shops, however, will refuse to give warranties for these types of external transmission repairs if they have not had the chance to check for further internal transmission issues.

Another possible transmission system repair you may need is transmission resealing. You will know you need this if you find oil spots on the ground, parking slot or garage floor beneath your vehicle. This means your vehicle is leaking transmission fluid. This can happen even while your vehicle seems to be in good running condition. To check for leaks, your vehicle will have to be mounted on a lift at the auto service shop. Leaks found on external gaskets and seals can be sealed without removing the entire transmission system from the vehicle. If the leak is in the front seal, however, you will have no choice but agree to have the transmission lifted out for repair. This will cost you more.

Undeniably, a vehicle owner who is better equipped with knowledge on automotive transmission repair services is in a better position to discuss these things with a Tampa auto service mechanic. You will be less likely swindled out of your hard earned money.

About the Author

Mad Hatter Auto Service, Muffler and Brakes
Contact: Victor Zamora
4916 W Linebaugh Ave, Suite 101, Tampa, FL 33624
Phone: 813-374-9230
Email: info@madhatterexhaust.com
Website: www.madhatterexhaust.com

Engine-transmission compatibility?

Does the NV4500 transmission mount up to a 383 stroker? I'll be replacing my truck's engine and transmission and automotive isn't necessarily my field.. Trying to get a little helpful input.

The NV4500 from a GM truck will mount to any late model smallblock ( with the manual bellhousing ) but you will also have to have the proper shift linkage and mounts. Also unless the truck had one you will need a new driveshaft ( if 4wd also possible transfer case problems ) Note that not all that many GM trucks used this tranny as the vast majority were automatics or the heavier 5-speed. ( the versions use by Chrysler/Jeep will not work )

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