The Borg Warner T4 was a four-speed manual transmission commonly found in Jeep CJ models from 1982 to 1986‚ offering a standard shift option. This transmission aimed to improve upon earlier designs with enhanced bearing support.
Overview of the Borg Warner T4 Manual Transmission
Brief History and Applications
The Borg Warner T4 transmission emerged as a standard shift‚ four-speed gearbox employed in Jeep CJ models spanning from 1982 to 1986. As a top-loaded transmission‚ it represented an evolution from earlier designs like the SR4‚ aiming to enhance durability and performance. Specifically‚ the T4 incorporated tapered roller bearings on the input and output shafts‚ along with a straight roller bearing on the counter gear‚ offering improved support and longevity compared to the ball and needle bearings used in the SR4.
Its application was primarily within the Jeep CJ lineup during those years‚ serving as a reliable manual transmission option for off-road and everyday driving. It was designed for use with the AMC 258 I6 and GM 151 I4 engines.
Identification of the T4 Transmission
Identifying a T4 transmission involves checking its dimensions. The T4 case measures approximately 9-1/4 inches long‚ with a total length of 15-1/4 inches when including the shifter/tailhousing assembly.
External Features and Dimensions
To accurately identify a T4 transmission‚ several external features and dimensions should be carefully examined. The T4’s case length is a primary indicator‚ measuring approximately 9.25 inches (9 1/4 inches). When combined with the shifter and tailhousing assembly‚ the total length reaches about 15.25 inches (15 1/4 inches). This overall length is a key distinguishing factor when comparing it to other transmissions.
Visually‚ the shifter design can also provide clues. The T4 features a curved shifter‚ unlike the angular bend found in transmissions like the T176. Observing the shape of the shifter can aid in differentiating the T4 from similar models. Ensure accurate measurements and compare shifter designs for reliable identification. These steps are vital for confirming the presence of a T4.
Casting Numbers
Casting numbers are crucial for identifying the Borg Warner T4 transmission. Typical casting numbers found on the T4 transmission case include “13-51”. These numbers are usually stamped on the exterior of the transmission housing and can serve as a definitive identifier. To locate these numbers‚ thoroughly inspect the transmission case‚ particularly on the main body and any detachable sections.
Documenting the casting numbers you find is essential for confirming the transmission’s identity. Compare these numbers with known T4 casting numbers to ensure accurate identification. Keep in mind that variations may exist‚ so consulting multiple sources can be beneficial. Correctly noting and verifying these numbers will prevent misidentification.
Gearbox code
The gearbox code is a crucial identifier for any manual transmission‚ including the Borg Warner T4. This code provides specific details about the transmission’s manufacturing specifications‚ gear ratios‚ and intended vehicle applications. Locating the gearbox code on a T4 transmission typically involves inspecting the transmission’s housing for a stamped or engraved alphanumeric sequence.
This code is often found on a flat surface of the gearbox casing‚ easily accessible for identification. Once the gearbox code is located‚ it should be carefully recorded. This information is essential for ordering correct replacement parts‚ such as gears‚ bearings‚ or complete rebuild kits.
Jeep CJ Models
The Borg Warner T4 manual transmission was a common feature in Jeep CJ models manufactured between 1982 and 1986. This four-speed transmission offered Jeep enthusiasts a standard shift option during those years. Specifically designed for Jeep CJ vehicles‚ the T4 provided adequate performance for both on and off-road driving conditions.
The T4 was paired with various engines offered in the CJ lineup‚ including the AMC 258 I6 and the GM 151 I4 engines. These engine options provided a range of power outputs‚ catering to different driver preferences and needs. The T4 transmission in Jeep CJs was known for its durability.
Distinguishing T4 from Other Transmissions
The T4 transmission case is approximately 9-1/4 inches long‚ plus a 6-inch shifter/tailhousing‚ totaling 15-1/4 inches. Typical Borg Warner casting numbers found on the T4 are 13-51‚ while the T5 is 13-52.
T4 vs. T5
When differentiating between the T4 and T5 transmissions‚ several key features can aid in identification. The T4 is a four-speed transmission‚ while the T5 offers an additional fifth gear for improved fuel economy and highway driving. Externally‚ both transmissions share a similar case design‚ with the T5 typically having a slightly longer tailhousing to accommodate the fifth gear mechanism.
Casting numbers can also provide clues‚ with T4 transmissions often featuring “13-51” markings‚ while the T5 may display “13-52”. Furthermore‚ the shifter linkage and internal components differ between the two models‚ reflecting the T5’s more complex five-speed design. The T5 is generally considered a stronger transmission‚ better suited for higher horsepower applications compared to the T4.
T4 vs. SR4
The T4 and SR4 transmissions‚ both found in Jeep vehicles‚ represent distinct designs with varying capabilities. The SR4 is a light-duty four-speed manual transmission known for using ball and needle bearings‚ whereas the T4 improved upon this with tapered roller bearings on the input and output shafts.
Visually‚ the T4/T5 transmission case measures approximately 9.25 inches in length‚ excluding the shifter/tailhousing assembly‚ resulting in a total length of 15.25 inches. The SR4 has a 23 spline output shaft for connecting to the transfer case input shaft. The T4 is generally considered more durable and reliable than the SR4‚ which was known for experiencing issues under heavier loads or off-road conditions. This makes the T4 a preferable option for those seeking a robust four-speed transmission.
Common Issues and Problems
Like any mechanical component‚ the Borg Warner T4 transmission is susceptible to certain issues and problems over time. Owners might experience difficulty shifting gears‚ often stemming from worn synchronizers‚ which are crucial for smooth gear engagement.
Another common problem includes excessive noise during operation‚ which can be indicative of worn bearings or damaged gears within the transmission. Leaks are also frequently reported‚ usually originating from seals or gaskets that have deteriorated with age. In severe cases‚ gear breakage can occur‚ leading to complete transmission failure. Regular maintenance‚ including fluid checks and timely repairs‚ can help prevent or mitigate these common issues.
T4 Transmission Parts‚ Rebuild Kits and Overhaul Kits
For those looking to restore or maintain their Borg Warner T4 transmission‚ a variety of parts‚ rebuild kits‚ and overhaul kits are available. These kits typically include essential components such as synchronizers‚ bearings‚ seals‚ and gaskets necessary for a comprehensive rebuild.
Individual parts like gears‚ shafts‚ and shift forks can also be purchased separately to address specific issues. Selecting high-quality parts is crucial for ensuring the longevity and performance of the rebuilt transmission. Overhaul kits often provide a cost-effective solution for addressing multiple issues at once‚ offering a complete set of components for a thorough restoration;
Resources for Rebuilding or Repairing a T4 Transmission
Rebuilding a Borg Warner T4 transmission can be a rewarding but complex task. Fortunately‚ numerous resources are available to assist enthusiasts and professionals alike. Online forums and communities dedicated to Jeep vehicles often contain valuable information‚ including step-by-step guides and troubleshooting tips.
Additionally‚ various websites and retailers specialize in providing technical manuals and diagrams specific to the T4 transmission. These resources can be invaluable for identifying parts‚ understanding assembly procedures‚ and diagnosing common issues. Furthermore‚ instructional videos and workshops offer visual guidance for those who prefer a more hands-on learning experience.