12/25/2023 0 Comments T 400 transmission![]() ![]() ![]() However, there will come a time when the old transmission shows signs of wear and tear. The TH400 transmission is respected and loved due to its versatility and durability. Rebuilding the TH400 Transmission to Your Engine On the other hand, the TH350 transmission uses a mechanical relay or cable kick-down mechanism attached to the throttle linkage. This transmission uses an electric slide switch that controls the throttle linkage mechanism. You can quickly identify the Turbo 400 transmission by checking out its kick-down assembly. The other variant of the Turbo 400 transmission was the TH475 a heavy-duty transmission used extensively in large trucks from 1975 onwards. It was used extensively in several small vehicles and easily identified by the ‘375-THM’ lettering carefully etched on the bottom or underside of the tail housing. The first variant, i.e., the TH375 transmission, was made public from 1972 to 1976 in smaller displacement vehicles. General Motors created two significant variants of the Turbo 400 transmission. Nevertheless, it is surprisingly compact, considering the immense power it can handle. The TH400 transmission is admittedly the largest of the regular General Motors transmissions. The shape of the fluid pan is somewhat irregular, likened to a distorted Texas pattern. The rear mounting face of this transmission showcases a bold hex pattern with several ribs that run forward longitudinally. The Turbo 400 transmission has a main cast aluminum case measuring 24-3/8 inches long. The TH400 transmission weighs 135 pounds minus the fluid. In addition, it has three tail shaft lengths and bell housing integrated into the transmission. One common feature of the TH4oo transmission is its iron and aluminum construction. The Turbo 400 transmission is a highly durable gear mechanism that offers improved performance over its predecessors. Military and heavy-duty GM vehicles still use this transmission as it is still produced today. The Turbo 400 Transmission required a kick-down switch by the gas pedal to inform the transmission when to kick down a gear. The TH400 transmission is an electronically-controlled, heavy-duty version of a TH350. This was also the year an early introduction of the 4L80-E transmission, the successor of the Turbo 400 Transmission that has overdrive, was made. This name change was necessary as it made readily identifying the transmissions easier. In 1990, this transmission changed from TH400 to 3L80, resulting in longitudinally positioned 3-speeds and 8,000lbs. By the time the ’70s arrived, the TH400 transmission was already used in heavy-duty GM trucks in 2WD and 4WD versions. This feature helped the torque converters characters in the transmissions and can easily be identified by the 2-prong plug on the case. The TH400 transmissions from 1965 to 1967 featured a mechanical device known as a variable pitch stator. The TH400 transmission was used in Pontiacs and Cadillacs in the first year but somehow found its way to Chevrolets, Oldsmobiles, and other models by 1965. This transmission was designed to substitute the ST300 2-speed automatic transmission. The TH400 transmission – or Turbo 400 transmission – was General Motors vehicles’ brainchild in 1964. Here’s what you need to know about TH400 transmissions and how to rebuild them for faster and better performance. It is highly recommended that you leave this project in the hands of professionals. But if you don’t possess the skills of a mechanic, you shouldn’t attempt rebuilding your transmission. It is a challenge that will take a good mechanic almost all weekend. Also included is a dipstick assembly, universal transmission cooler and three gallons of premium TCI Max Shift Street Performance transmission fluid.Rebuilding a transmission, such as the TH400, is not relatively as easy as changing your car filter or making an oil change.This TCI transmission package consists of a triple-tested TCI transmission and precision-tuned TCI Breakaway torque converter.Higher line pressure for extra firm shifts and greater torque capacity with less slippage.Includes a chrome-plated transmission pan with embossed TCI logo.Improved lubrication system increases fluid sent to planetaries and internals.Special clutches and bands increase durability new sprags and roller clutches increase holding capacity.Universal GM StreetFighter TH400 4" Tail Transmission Package with BRKWY torque conv, dipstick, TV cable, cooler, and fluid.ĭue to the decline of available TH-350 and TH-400 Chevrolet bolt pattern transmission cores, all StreetFighter & Super StreetFighter transmission packages will consist of a BOP (Buick-Olds-Pontiac bolt pattern) case with an included BOP to Chevy adapter plate (Part# 230000) effective June 1, 2022. ![]()
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