It was used in GM cars and trucks through with small-block engines. The TH transmission was first used in in Cadillac and Buick automobiles. The other GM brands got the TH in The TH was used in passenger cars through and trucks through the early s. Both transmissions are noted for strength and durability but the TH is the stronger of the two.

There are numerous aftermarket parts and complete units available from a host of suppliers. Park the vehicle on a paved level surface and set the parking brake. Raise the front of the vehicle and support the front with jack stands. Measure the transmission case with a tape measure. Do not include the tailshaft housing which bolts to the rear of the case.

Look at the driver's side of the transmission.

TH400 Transmission Specs, ID, and Common Problems

The Turbo has a "kickdown" cable attached to the right side attached to a manual linkage on the transmission. The Turbo has an electrical switch. Look at the transmission pan. The Turbo has a basically square pan with one corner cut off.

It actually has five sides. The Turbo pan is longer than it is wide. The part of the pan at the rear of the transmission looks like the lower part of the state of Texas really. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Step 1 Park the vehicle on a paved level surface and set the parking brake.

Step 2 Measure the transmission case with a tape measure. Step 3 Look at the driver's side of the transmission. Items you will need Jack Jack stands Measuring tape. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Reverse- 2. Use this diagram to help you.

There is no difference other than the name. Note that unlike all the other GM transmissions of the time there was no E at the end of the nomenclature. It was eventually replaced by the 4L80E.

There are were a few one of versions of the Turbo as well. These are the TH, and the TH It was modified to fit the TH driveshaft yolk. If you are looking to purchase a TH avoid it. It is just huge. There are 13 bolts on the pan underneath the transmission. If you count 13 you are almost home free, but the Th also has The TH uses an electronic kick-down mechanismwhich means that there will be an electric plug on it. The TH uses a mechanical linkage that attaches to the carburetor. Th has the vacuum modulator in the back, and the TH keeps it on the side.

Using the pan bolt pattern is the easiest way to identify the TH Identifying the Th is really as easy as knowing the differences between it and the TH The Th has a much more complex pan then the Th The Th is basically a square with a corner taken out of it. See for yourself. The TH on the other hand has 9 different angles on the the pan. The Turbo has a much simpler look. It is machined into the transmission in most cases.

Try using this guide to help you lock down what model number you may be looking at. Maybe the best compliment comes from your competition.

And at least a dozen auto makers have paid GM to use the TH instead of creating a competitor for it.

turbo 400 transmission identification tag

This is a true testament to its bulletproof reliability and ease of tuning. The Turbo has been used in Jeeps from the factory.

turbo 400 transmission identification tag

Later, a specific TH was made just for Jeep. This version tilted the transmission about 4 degrees in order to better accommodate the transfer case. It has not been produced for quite a while and is considered pretty rare. The Turbo is compatible with most Jeeps. However, the CJ5 has to narrow of a wheelbase to accommodate it.

Some of the AMC specific adapters on these transmissions have been prone to failure. Th and Th There are were a few one of versions of the Turbo as well.The Jalopy Journal. Terms of Service. Privacy Policy. Log in or Sign up.

Atomic Industries www. Register now to get rid of these ads! The H. Going to buy a used turbo tranny tomorrow but need to know how to identify one so that i know what i am getting.

Thanks matt. Try this. DarbyJan 21, Easy way to tell is that a turbo has the vacuum modulator on the side, and a turbo has it on the rear. Turbo also has the electric plug for the electric kickdown, whereas a turbo has a cable for mechanical kickdown.

The pan shape is also very different. PaulJan 21, The pan is shaped like the state of Utah. Another quick difference is the tailhousing. The has a bolt on tail housing, i think 5 or six bolts around the perimeter, can't remember right now.

How to Identify a Turbo 350 or Turbo 400 Transmission

The dosn't bolt on at all, it's cast into the housing. And like stated before, no kickdown cable on a TonyJan 21, You must log in or sign up to reply here.Register or Log In To remove these advertisements. I need some help in decoding this id tag. I have done many searches and can't find any info on this type of tag numbers. All I have seen have 2 letter codes not 3 letters as this one has.

By the pan style it is a TH, but i would like to know the year and what it was used in. The tail is 9" with a 27spline shaft. Any help would be great, thanks. Attached Images. Find More Posts by kwmech. Motors Trans. Thanks 16N67, so is it a or ? It doesn't have stamped in bottom of tail housing.

Thanks again for the info i couldn't find any list online that had that code listed. GM used to call them a in the 70's, now it seems they are called a with a spline tail shaft.

They still made them into the late 80's. Three letter codes started in OK great, so i guess the R series is a 2wd drive truck, correct?

Do you know of any place online that has the three letter codes listed. I called a local drivetrain shop asking about a slip yoke for it and they told me the TH didn't have a 27 spline shaft. He kept insisting i had a th I told him i know what the pan looks like. But anyway will a slip yoke from a th work the same? Also i have a 9" tail housing what length yoke should i get, anything special?

I have never found the numbers online. I have the Motors Domestic Transmission manuals that list the codes. All times are GMT The time now is PM. Contact Us - chevytrucks. Web chevytrucks. User Name. Remember Me? Site Merchandise FAQ. Mark Forums Read.Seeing as we don't know a heck of a lot about Ford automatics, we abducted a variety of transmission experts and interrogated them for the following information.

We found that like GM, Ford also made a number of trannies capable of fulfilling the needs of the weekend warrior, class racer, heavy hauler, and Sunday driver. Follow along as we take an in-depth look at the two-speeds, three-speeds, and the overdrive units. Ford offered a "Fordomatic" two-speed between and in six-cylinder applications exclusively mainly in Falcons, Comets, and so on. They are easily identified by their one-piece aluminum case. Unlike GM's Powerglide, they offer no performance advantages, so forget 'em.

Ford's various three-speed automatic transmissions came in a number of applications and a variety of types. The lightest duty of the three-speed automatic transmissions, the C3, and the oddball "Cruise-O-Matic" series probably won't be of any interest to many car crafters. Introduced inthe C4 was Ford's first light-duty three-speed automatic transmission. It was used behind four-cylinders, six-cylinders and small V-8s by all Ford divisions Ford, Lincoln and Mercury.

An interesting feature of the C4 is its bolt-on bellhousing, which allows it to be easily adapted to a variety of engine applications. There are two major C4 case variations with respect to dipstick location: Those with the dipstick in the case were primarily used in passenger cars, while those with the dipstick entering directly into the trans pan were used mainly in trucks, vans and some fullsize cars.

4L60E Design Changes and Tags

On transmissions with the dipstick in the pan, the bolt-on bellhousing was also make larger to accommodate a inch torque converter the smaller-cased units housed an inch torque converter.

Internally, both versions of the C4 are the same.

Popular Automatic Transmission Identification Chart

A lockup version called the C5 was introduced in and continued in use until production ended in The C5 used a lockup converter and different valvebody programming, but it was otherwise similar to other C4 transmissions. C4s were original equipment behind,and W V-8s.

Harvey Baker of Performance Automatic Transmissions, makers of some of the toughest C4s available, says the company prefers the C4 over other Ford offerings because they are light and efficient, ranking along with the GM Powerglide and the Chrysler as the least-power-robbing automatics.

If there is a weak point, Baker says, the stock planetary is the component most apt to fail on a C4. To address this, Performance Automatic builds a rollerized planetary system see Fig.

Super Comp transmissions feature standard gear spacing see chart belowa hardened spline input shaft, the rollerized planetary system, six-gear pinion, six-clutch drum, and a lifetime warranty. Performance Automatic claims to have yet to experience breakage with one of its Super Comp C4s, and the company is so confident in its strength that it recommends this unit over even a beefed-up C6.

The C6.Nearly all of the GM automatic transmissions have a few things in common. They are all made of aluminum. This is espescially true for the people who are still using the generation I and II small-block Chevy. Although the TH has been phased out for more than 20 years, you can still find one in the salvage yard. You certainly should not depend on the tech working at the yard for confirmation of what you have. I am not saying that people are liars. Most of the time they are not.

There are a few things that all of the longitudinal gm automatic transmissions have in common. They all have basically the same bolt pattern on the bellhousing. But, they do not all bolt into the crossmember in the same space. They are also not the same length. Therefore, they are not all naturally compatible with one another. Certainly the easiest way to identify a GM automatic transmission is by the bolt pattern.

TH400 Transmission Cross Reference and Interchange Chart

The TH has a 13 bolt pan gasket. This is a fine way to whittle what you have in front of you. If you counted 13, you are either looking at the Turbo Transmission or the Turbo Most of the info on this site I just know. In this particular case I found that right here:. Really it is a lot easier to ID a transmission visually compared to the alternative of decoding it, but it is reasonable to try and understand exactly what you have.

Now, for the the purpose of this guide there are two different ways that GM printed the the serial label. They changed the way that they labeled their transmissions for the model year.

The TH began production in the model year. That would put it squarely in the second era, and this is how it went. This can be extremely difficult on the TH35o particularly because the ID tag can be found on several different places on the transmission.

It can be found on:.Select Transmission Select Make The Turbo transmission was a 3 speed automatic transmission developed by General Motors. This was one of General Motors editions of the Hydramatic transmission series.

This transmission is known more commonly by the name TH, although it did receive another name change in the late 80s, adopting the name 3L This is a durable and very well-known transmission, as it was in production for many years and applied to a wide variety of vehicles, not only General Motors.

This transmission eventually made its way into many of the truck applications for General Motors. The transmission was not exclusive to General Motors, as many luxury brands such as Jaguar, Ferrari, Rolls-Royce and many others made use of this transmission.

The TH was first introduced beginning inas it began to replace the Super Turbine transmission, which was a 2 speed automatic.

The Turbo was placed in many cars across GM as well as other car manufacturers during its long production life. Overall the transmission remained in production an impressive 27 years before it was eventually replaced by a 4 speed electronically controlled transmission, the 4L80E, in The TH was very popular, particularly known for its strength. One of the attributes that is credited with providing this strength is the cast iron center support.

Although the overall sentiment is that this is a very strong and durable transmission, some of the most common problems seen are clutch wear and hydraulic fluid leaks.

The Turbo is rated conservatively at peak torque of lb-ft. That being said, this transmission is commonly used in hot rods and paired with engines making far more torque, although these transmission also must commonly updated with some aftermarket parts. This 3 speed transmission has its gear ratios defined as 2.

turbo 400 transmission identification tag

The Turbo is primarily constructed of cast aluminum, with the bell housing being integrated into the transmission and also made of cast aluminum. Some areas are cast iron, such as the center support for the transmission. The TH is This transmission does vary in the amount of fluid required, based on certain specifications such as which torque converter is used.

That being said, a common fill volume is between quarts for a stock transmission. The TH, or Turbotransmission was a 3 speed automatic that was first produced in This transmission became well-known for its strength and was very popular, based on its life and the number of applications in which it was installed.

turbo 400 transmission identification tag

It was not only used in General Motors applications, but was also used for many luxury cars. Overall this transmission was in production for 27 years, and to this day is commonly used for many aftermarket applications. TH Rebuild Kits. TH Filter Kits. TH Shift Kits. TH Cooler and Lines. TH Torque Converters. TH Parts. Is your transmission leaking? Try Transmission Sealer or Stop Leak