4r70w jmod f150

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Whats the "j-mod" for 4r70w? Thread starter fastangboi Start date Sep 14, JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Jul 26, 0 0 Slowville. May 15, 1, 0 37 Gadsden, AL www. I have had it done to mine along with a cooler and 4.

It shifts firm, crisp and quick as possible. TGJ New Member. Mar 30, 1, 4 0. Nov 29, 8, 3 78 A little grass shack on a big lava rock. You don't put in any "rivets" nor is it too firm for a DD. WOT shifts are a different story though. Nov 22, 0 0. They are real easy to install. VicRattlehead Founding Member. Apr 8, 0 0 41 ChiTown Il thunderbird. Jakes New Member.

May 8, 84 0 0. VicRattlehead said:. My lentech unit works well. They build it to your specs and don't just pull something off the shelf like others do. I am happy with my unit.This writeup provides picture-based instructions for safely and effectively exchanging the transmission fluid in a F 4R70W transmission with new fluid.

There are myriad web pages on the internet for servicing the 4R70W, as it is the automatic transmission commonly used in Mustangs and in Crown Victorias, but very few resources when it comes to servicing the transmission in a truck.

I was personally frustrated with the lack of any useful information on performing the fluid change procedure, so I researched and researched and put together this guide. When I say "useful information", I mean something more than an article written entirely in text and with no explanation of the different parts of a transmission.

I believe that anyone with a general knowledge of automotive handywork should be able to do this job on a weekend afternoon. Before we proceeed, I should explain what exactly is being done in this procedure since I am not simply regurgitating the information in the Haynes manual.

Under normal circumstances, approximately 4. If you are not familiar with the way this transmission is designed in the F, refer to the diagram below. Basically, the transmission utilizes a closed-loop cooling system where the transmission fluid is pumped forward of the vehicle to the radiator where it is cooled via the engine fan and airflow when driving down the road.

The cooled transmission fluid then returns to the transmission where it is utilized in the valve body and torque converter to keep the vehicle moving forward.

The Haynes manual suggests that you drop the transmission pan to replace the fluid, filter, and clean the magnet. While this does allow you to replace the filter and clean the magnet, you do very little in terms of changing out the fluid since most of it resides in areas of the transmission cooling system that are not accessible. Since my truck is aI was not able to access a drain plug in the torque converter. I did some research on some of the more popular forums that discuss the 4R70W TCCoAFonlineStangnet and found some people mentioning that they were able to use the cooler lines to perform a fluid exchange.

4r70w jmod f150

I spent about a week contemplating my options and looking around at the transmission and the cooler lines before I committed to purging the fluid via the cooler RETURN line AT the transmission. Search this site. Please excuse the crudeness of my drawing Basically, the transmission utilizes a closed-loop cooling system where the transmission fluid is pumped forward of the vehicle to the radiator where it is cooled via the engine fan and airflow when driving down the road.

You should be familiar with the terms used in this writeup and understand what is meant when direction is specified on a vehicle forward, rear, driver-side, passenger-side, etc. Basic tool usage. Know your truck. If your truck has a tow package of auxillary transmission cooler, this will change the fluid quantities I specify below for a stock system. Some dip sticks not specifically for the 4R70W in a F have a cold-fill mark, but mine did not.

This saves some time at the end of the procedure. Note that Mercon V is not a brand, but a lubricant characteristic specification created by Ford Motor Company. As long as the fluid meets or exceeds Mercon V, you will be fine. Quart-measured bucket, at least 5 quarts in capacity. I believe these are supposed to be used for mixing paint, but they work just fine.

I found a pre-measured package that was only a few bucks and turned out to be a lot more than I needed.

Ford 4R70W TCI Automatic Transmission Rebuild

You can always use the rest later for other automotive maintenance procedures. This will keep the vinyl hose pointing into the bucket.

4r70w jmod f150

Large 5-gallon bucket or multiple smaller containers for holding the old transmission fluid. Match the size of this bucket or containers with the number of new quarts of Mercon V that you plan on using. Part No. Optional Junk cardboard for catching any fluid drips.

If you can get a helper person, you can probably finish in 2 hours. Always expect the first time to take longer. Follow up procedures should go a lot quicker. You do NOT want to burn your hands against a hot transmission pan or against the heat shields.Your question may be answered by sellers, manufacturers, or customers who purchased this item, who are all part of the Amazon community.

Please make sure that you are posting in the form of a question. Please enter a question. Made in the USA, the Superior "Super Tough Plate" is zinc coated, extra thick and is the perfect replacement for the stock valve body separator plate used in this popular Ford application.

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4r70w jmod f150

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What is a Mustang J Mod?

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4R70W Valvebody Overhaul and Tips

View Full Image. Case in point: our 4R70W automatic transmission. Withmiles on the clock, the transmission had a pretty good run, but it was time for an overhaul. Desiring anotherout of a rebuild, we turned to the transmission experts at TCI. What started in as a shop dedicated to providing high-performance transmission parts to a small group of devout drag racers has grown to be one of the largest and most technologically advanced aftermarket drivetrain companies in the world.

So while we could have used the shop down the street, we chose to ship our transmission off and have it not only rebuilt, but also improved. Nothing that leaves the shop at TCI is left stock; the crew only provides performance builds. Our 4R70W is a great testbed to show just what goes into an automatic transmission rebuild since it was used in such a wide variety of trucks. This transmission was used for 10 years: to in the F pickup, to in the Expedition, to in the Explorer, along with the Mustang, Thunderbird, Cougar, Crown Victoria, and many more Ford applications.

From there, it grew into the 4R75W, which lived on in the F-Series until We also hope to give a little insight into building for performance and longevity.

The nomenclature breaks down like this: 4 - Four forward speeds R - Rear-wheel drive 70 - Torque rating x 10 will hold lb-ft Note: This rating is based on torque converter multiplication.

It won't stand up to an engine that makes lb-ft at the crank. W - Wide ratio. Gear Ratios First: 2. Our 4R70W automatic transmission had a presumed hard life. It spent its days bolted behind a 5. In an effort to get another quarter-million miles from our workhorse transmission, we strapped it to a pallet and shipped it off to the skilled hands at TCI.

First up—removal of the transmission pan followed by the valvebody. Next up is the removal of the reverse servo and manual first gear selector, followed by the accumulator. When reassembled, a stiffer spring will work to provide increased pressure. Also improved in the valvebody is the overdrive servo.The jmod is a modification to the 4r70w valve body.

That being your automatic transmission. It involves removing certain springs and drilling bigger holes in the seperator plate allowing fluid to move more quickly making shifts faster and firmer. This reduces the heat that the stock settings create because of more friction due to the longer delay which makes the stock settings shift soft and slow.

I had it done to my car along with an sct tune and tranny cooler and let me tell u it makes the auto a WHOLE lot more fun. Shifts as fast as a manual. I have beaten cars that should have taken me due to the fact they messed up shifting and my auto shifted hard and fast as the right time everytime! Next, remove the 25 bolts attaching the valve body to the transmission.

Before you can remove the separator plate from the valve body, you must remove the three round covers, and one small bolt in the corner. Be sure you note how these covers come off so you can be sure they go back on the valve body when you are finished with the separator plate modification. Now you will need to remove the old gaskets from the separator plate. Use a sharp putty knife, or gasket scraper. Be absolutely sure you remove ALL traces of the old gaskets from the separator plate.

Whats the "j-mod" for 4r70w?

There is a small filter element located inside the bottom of the transmission case. Be sure not to lose this filter. I took pictures to show what it looks like, and where it goes, in case it should fall out. Now remove the old shift accumulator assembly from the transmission. In the photo you will see 4 round covers in the bottom of the case.

The shift accumulator is in the hole located in the top right of the photo. The next thing you want to do is to compress the accumulator assembly by use of a large C-clamp.

There is a flat-ledge location on the upper side of the transmission case to lock the C-clamp on while you compress the accumulator by tightening the C-clamp. You will then need a good pair of C-clip pliers to remove the snap-ring that holds the shift accumulator retainer in place.

Once you remove the snap-ring, simply loosen the C-clamp, and let the accumulator retainer come out. The entire accumulator assembly should come right out with the retainer.

If it looks clear, simply wipe the cylinder with a piece of scotch-brite and a clean cloth. The picture shows the entire accumulator assembly removed, including the broken lower spring. Install the new accumulator assembly with the new springs, and lubricate them slightly with a small amount of clean Mercon V fluid.

I elected to leave the bottom spring out to firm up the shifts. Push the entire assembly, including the retainer, up into the cylinder bore.

You may need to use one hand to hold the assembly up high enough to re-install the snap-ring. This is where a lot of people stop. In the case of my vehicle, I decided to replace the shift accumulator assembly as well since the valve body was out.

Unfortunately, I do not have any photos of this procedure but I will describe it for you. It is actually a lot easier to replace the shift accumulator assembly. The accumulator is located in the opposite, rear corner of the transmission case. Simply grab the retainer with needle-nose pliers, and pull it down. Then, by putting pressure with your fingers on the inside wall of the accumulator piston, pull downward, and it will come out.

There is only 1 spring in the accumulator assembly.Automotive Forums. I've seen this mentioned in a few previous various threads but never saw any specific information posted on AF. Who does this apply to? J-Mod: What is it? The J-Mod is intended to increase shift speed and decrease wear on the clutches of the automatic transmission. Who can do it? Anyone with basic hand tools, an ability to follow instructions, and patience can complete this job in their garage in a few hours.

The only thing you may not have on hand as a non-mechanic are an inch-pound torque wrench and proper sized drill bits. What does the job entail? Well, you will be taking apart the valve body of an automatic transmission.

This may sound confusing, scary, downright sadistic, but after doing it myself, it's one of the easier things I've done. The following are NOT detailed instructions and should not be performed as such without reading the full J-Mod instructions link below. A basic synopsis of what will be performed: Remove the transmission pan, filter, and automatic transmission fluid ATF Remove electrical harness from solenoids on the valve body Remove the valve body from the transmission housing Remove the separator plate from the valve body Widen several holes with a drill in the separator plate Reinstall separator plate and new gaskets to valve body Remove or replace with a softer lower shift accumulator spring Remove shift accumulator spring Clean all accessible parts, including pan magnet Reinstall valve body into transmission housing Reconnect electrical harness Install new filter Reinstall transmission pan Refill with Mercon V Really, how hard is it?

I never ever worked on a transmission of any sort. I also have done only pretty basic mechanical tasks, such as changing oil and changing a few engine bits and pieces see signature. It took me 4 hours, double checking, and triple checking my work.

It was also below freezing on my garage floor and took breaks every 15 minutes or so to regain feeling in my fingers. What will I need? The J-Mod calls for the removal of the shift accumulator spring there is only one no matter what your horse power range. It really doesn't feel too hard under any situation, but is noticeably better than factory. The shift accumulator has two springs - an upper and a lower.

The option you have if your HP level allows for it is if you want to completely remove the lower spring. If you remove the lower spring, the shift will be quite firm under all throttle conditions. If you choose to install a softer spring, you will still get improved shifts, but will be less firm. I opted to completely remove the shift accumulator spring. During daily driving, the shifts are not harsh enough to cause discomfort. When WOT, the tires chirp and is a wonderful feeling being thrown into the back of the seat.

Most people say that it shifts faster and more firm than a manual. Will the J-Mod ruin my transmission? The J-Mod is actually one of those cases that can increase the life of your transmission. Since the J-Mod reduces the time that the clutches slip thus shifting from one gear to the next, the clutch wear and ATF temperatures are reduced. However, if your transmission if already not performing well, this is probably not for you. But who knows, maybe all it needs is new fluid to be restored to health.The 4R70W automatic transmission in the Ford 4.

And so, you may be asking yourself: How can I tell if my automatic transmission needs an overhaul? How can I tell if it's just a shift solenoid that's bad? These are some of the most frequently asked questions I get and if you're having an automatic transmission issue with your GM rear wheel drive vehicle, this article might have some of the answers you're looking for. One, the most common, is caused by some sort of electrical failure and which causes the vehicle's computer to command the automatic transmission to stay in 2nd gear no matter what the vehicle's speed.

Each one of the above conditions has a specific cause and in the next sections, we'll explore this a bit more in-depth. The 4R70W automatic transmission in your Ford car, pick-up or SUV is electronically controlled via several solenoids and sensors, all of which live inside the transmission well, all except the vehicle speed sensor.

In conclusion, I want to emphasize that the most important things that will tell you that you have a solenoid or internal transmission sensor problem is:. Let's turn the page and find out more about the specific symptoms an automatic transmission with internal damage and that will require an overhaul Ford 4.

Page 1 Page 2. A low level of transmission fluid usually due to a transmission fluid leak can also cause the transmission to slip. Transmission does not shift out of gear. The usual cause of this condition is a bad shift solenoid All Articles: 4. Do NOT follow this link or you will be banned from the site!

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