Where Do You Put In Transmission Fluid
Where Do You Put In Transmission Fluid – Need your automatic transmission serviced? The automatic transmission fluid (ATF) market has become saturated recently, if you’ll excuse me. There are usually two choices: F Type for the Blue Oval guys and GM’s Dexron for everyone else. Today, Ford alone has seven different automatic transmission fluids. Confusion abounds as Chrysler sprays the Dexron III and VI versions with +3 and +4 fluids, multiplied by dozens of oil companies offering versions and variants of these fluids.
To make sense of it all, we enlisted a little help from a friendly environmental tribologist: Lake Speed, Jr. Yes, Dad is NASCAR’s Lake Speed, but more importantly, our Speed is the petroleum engineer’s guide through this slippery ATF maze.
Where Do You Put In Transmission Fluid
What drove the explosion of this fluid name was OE’s quest to improve fuel economy. Each car company has developed special lubricants to meet increasingly narrow requirements. Combined with the increasing number of gears and various automatic transmissions, such as continuously variable transmissions that require special fluids, we are walking through the ATF maze.
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Adding to this confusion are the many claims that newer fluids are backwards compatible. Unfortunately, this is not always true. Let’s provide a specific example to show how complicated it is. Let’s look at a GM 4L60E automatic in a 2000 Camaro or Corvette. Dexron VI is often claimed to be the correct filler, but Dexron VI didn’t come out until 2005, meaning this transmission was originally a factory filler for Dexron III.
Not a big deal, as Dexron VI will definitely work. Taking a closer look at this fluid with Speed, we found that Dexron VI is in many ways a better fluid with a more stable viscosity at higher temperatures, but it is a lower viscosity, which is the current goal of the material. search burns better. to meet automotive company mileage requirements and Company Average Fuel Economy (CAFE) standards.
The Dexron VI appears to be compatible with older TH350 and TH400 transmissions. The reality is that Dex VI is best suited only for new cars. Speed was tested using Dexron VI on an older machine designed for Dexron III and found a slight increase in converter speed, apparently due to the lighter viscosity of Dexron VI. This may be useful for some applications, but not for others.
Newer fluids are generally not suitable for three-strokes from the 1960s onwards. 21st century automatics are specifically designed to use fluids with additional friction-modifying additives to smooth clutch engagement. The clutch packs on these later transmissions are designed to be compatible with this new fluid. However, older performance transmissions such as TH350 or TH400, Torqueflite 727 and 904 or Ford C4 and C6 will not run with this upgraded fluid.
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Trying to make sense of it all, Speed suggested using the calendar year 2000 as a crossover point. Transmissions built after this calendar date are programmed to use the most modern ATF. Before the turn of the century, the use of more conventional fluids would be considered for automatic capture.
With that in mind, the next obvious question is, should I use ATF in older transmissions? Let’s say we built a big-block Chevelle with monster torque and highway traction pushing a TH400 transmission. The car sees most of the miles on the road, but spends weekends on the drag strip. Dexron VI won’t hurt the transmission, but that would also be the best plan. This seems to leave Dexron III as the only option. But Speed is recommended to consider Ford Type F fluid in most, if not all, of these automatics.
It may seem unethical to brand loyalists, but the choice is very rewarding. Genuine Ford Type F fluid is formulated with a reduced friction converter package to create clutch acceleration and reduce clutch slip.
GM drag racers have known this method for decades and use Ford Type F fluid to improve shift quality, and it’s still a good plan today. The Ford Type F isn’t always on the shelves of local auto parts stores, but it’s still easy to find.
When To Change Transmission Fluid Of A Car
If you’re looking for a high-end F-type car, check this out: ATI has been building torque converter and drag racing cars for decades, and recently commissioned Oil Driven to develop not one but two versions of the old F-type for drag. races.. As we mentioned in our parts list, ATI offers 20 and 30 peso versions. A heavy machine with a lot of torque might choose the 30W model, while other areas might use a lighter fluid or set the stall speed slightly higher. It is a purely synthetic fluid, so it is a bit more expensive.
Usually the question arises about mixing different types or periods of ATF. Of course, in an emergency, any ATF is better than nothing. But it is important for the experienced hobbyist not to mix liquids with different additive packages. It comes back to understanding what all the different labels mean. For example, Chrysler now has a special +4 fluid that uses a different additive package than Dexron and Mercon.
To reduce confusion, many oil companies now market a variety of compatible fluids. For example, you will see fluids that offer a combination of Dexron and Mercon fluids. Although the original factory specifications of these two fluids are different, they are also close enough that an ATF can comply with both. However, if you find a one-size-fits-all fluid, it is best to avoid it, as the more common the fluid, the less likely it is to be suitable for your transmission, especially its performance. For older automatics, it is especially important to avoid continuously variable transmissions (CVTs) and fluids defined as low viscosity (LV) or ultra low viscosity (ULV). These lubricants contain unique friction modifiers designed to meet specific mileage targets, which can be said to have a detrimental effect on performance applications.
Synthetic is another term often used for motor oil and transmission fluid. Basically, it depends on the quality of the base oil. While most of the conversation so far has focused on additives, base oils are especially important for temperature stability. Synthetic base oils can be called PAOs, which are defined as polyalphaolefins, and are the best choice for synthetic base oils. Exxon-Mobil recently developed a new mPAO (metallocene polyalphaolefin) base stock that offers significant improvements in viscosity ratings.
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All this limits the scope of research in the field of petrochemicals, but if one intends to use the search for ATF, one will start with a purely synthetic base stock. Look for the fluid listed as pure synthetic, for example in the parts list. These include AT3 and AT6 fluids using the latest mPAO base stock as well as ATI fluids. You will also see the term synthetic blend to describe some ATF fluids. It is an attempt to improve traditional base oils by adding a certain percentage of synthetic oils.
The main advantage of using synthetic ATF is its thermal stability. Automatic performance and high standby converters generate a lot of heat. Heat tends to destroy the fluid additive package and reduce performance, which can lead to inconsistencies as read on the timing sheet. Synthetic ATF, which is more stable on the road, maintains its quality for a long time, withstands high temperature conditions and protects the transmission from damage. Of course, this improved performance is worth it.
We’ve found that shopping for price really pays off. Most automatics require 14 quarts (typically 4L80E) depending on converter size and pan depth, so this is a significant investment in fluid. The most interesting price comparison we found was a Delco Dexron VI Quart alternator for $9.69 through a private seller on eBay. After a few knocks, we went to RockAuto and found the same AC Delco ATF for $3.73. If we needed the 12L, RockAuto would save us over $70. We found a bad example where RockAuto sold us everything we wanted for $3.44 a quarter while an Amazon seller was asking $12 a quarter for the Motorcraft Type F. That’s almost a $9.00 difference!
You can expect the future of automatic transmissions to be an even bigger crazy blanket of ATF variants, as OE sees it.
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