![]() I would avoid the 8 bolt wheels, as they tend to have higher rear end ratios. The 400 can be tolerable on the highway if you have a numerically low ratio in the rear. I considered swapping to a 4l80, but I decided it wasn't worth the effort, since I keep the speed at 55 anyway.īoth the 400, and the 4l80 will grant you a decent service life if you change the fluid and filter, and don't get them too hot. Automatic 3-Speed TH-400 2.5 tail housing Uses 4×4 output shaft with 1.325 stickout for shortest length Transmission mount bracket included w/kit, as it is. I just put a rebuilt 400 (technically a TH475) in my 35' motorhome, and it will jolt your head back when it shifts. The 4L80 is still a robust trans, and will better serve highway cruising. The converter is what necessitates the electronic controls. This trans uses many of the TH400's parts, but includes an overdrive and a lockup converter. Our experts can help you choose the right transmission, converter, or shifter for your exact combination and racing goals. In the late '80s, GM started shifting (get it?) towards the 4L80E. Turbo 400 Powerglide 4-Speed Safe Neutral Reverse Pattern Shifter Accessories Other Items Oils & Fluids M&M Shifters Custom Converters About FAQ News Contact (573) 636-4136. The internals were also used in the front drive TH425, as well as bits used in the Allison 4 speed AT545. Turbo-Hydramatic 400 3-speed (Pontiac code M-40) from 1967-74. OEM Rated Cases Manufactured from superior materials to meet exacting standards, OEM transmission cases provide superior. The TH400 is an aluminum cased three speed automatic transmission that was produced by GM. Powerglide 2-speed (Pontiac code M35) from 1970-1973. TH400 Transmission Specs, ID, and Common Problems. They were: ST-300 which was a Buick 2-speed used from 1964-69. It was made by GM, and used by GM, Jeep, Rolls Royce, Jaguar, Ferrari, and numerous heavy applications such as medium duty buses and dump trucks. From the information I have, Pontiac used 4 different transmissions in the 1964-74 Tempest/Lemans/GTO. ![]() How to Identify Your Transmission TH350 and TH400 Transmissions can be. As previously stated, the transmission is popular in high performance applications and can be affordably built to manage a tremendous amount of power and is praised for its high strength to weight to ratio.The TH400 is the default transmission used throughout the '70s & '80s. speed, AKA the Turbo 400, TH-400, or THM400. (Weve tested 400 transmissions against 350 transmissions. Chevrolet’s simple solution for this was a steel spacer placed between the crankshaft flange and a flat LS flexplate. The transmission, like other automatics, relies on the Simpson planetary gearset, which revolutionized the operation of the automatic transmission. This transmission comes with a mild shift kit and a heavy duty torque converter with TIG welded fins. So, when bolting an older transmission like a Powerglide, TH350, TH400, 2004-R, or early 700-R4 to an LS engine, there will be a 0.400-inch gap between the flexplate and the torque converter. The "3" stands for three speed, the "L" for longitudinal (mounted), and the "80" for a GVWR of 8,000 lbs. It first appeared in 1964, where it was used as a. The name changed in 1987 to the 3L80, which was essentially the result of General Motor's new drivetrain naming convention. The Turbo Hydra-Matic 400 transmission was General Motors heavy duty, 3 speed automatic transmission. In trucks, the TH400, or "Turbo 400" as it is often referred to, the transmission was used until 1990 when it was replaced by an overdrive evolution of itself, the 4L80E. It is slightly larger and marginally stronger than the TH350, as it was designed for use behind General Motor's various big block V-8 engines. It has been given a conservative input torque rating of 450 lb-ft, although its application in many high performance vehicles suggest that the transmission can handle much more abuse. ![]() This transmission became well-known for its strength and was very. That being said, a common fill volume is between 11-12 quarts for a stock transmission. The TH400, or Turbo 400, transmission was a 3 speed automatic that was first produced in 1964. This transmission does vary in the amount of fluid required, based on certain specifications such as which torque converter is used. The Turbo Hydra-Matic 400 transmission made its first appearance in 1964 Cadillac models. The TH400 is 24.37 long and comes in at a weight of 135 pounds dry.
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