![]() Its fluid pan is also irregular in shape. The ribs and rear mounting point of the transmission also featured a hex bolt pattern that advanced longitudinally. Without fluid, the Th400 weighs 135 pounds, but higher when fluid is added. The case is also extremely smooth and about 24–3/8 inches long. Particularly, its case was made with cast aluminum alloy, which accounts for its strength and durability. Here is a more detailed explanation of how to identify a turbo 400 transmission. The Th400 transmission was built with iron and aluminum, with a bell housing integrated into it. Talking of horsepower, how much horsepower does a TH400 have? A stock Th400 can handle between 400-450 hp but can be tweaked to handle as high as even 1000hp. lb though aftermarket versions can be modified to withstand more torque. The Th400 was placed longitudinally by the engine, so it provides the best power ratio and last longer for cars with rear-wheel drives. It also featured three tail shaft lengths and a 32 spline driveshaft. The Th400 transmission gears came in the following gear ratios first gear:2.48:1, reverse:2.08:1, and third gear 1:1. Again, while the Th400 is the largest widespread transmission from GM, its design is very compact. Technically, the lighter it is, the more efficient. While the turbo 400 transmission is originally built heavy, you can reduce its weight if you choose its parts carefully. They can last more than 250k miles which, of course, was a terrible business for GM. The Th400 transmission was built so strong that GM had to reduce the quality of subsequent versions because they lasted too long and still performed. The Th400 was the stronger version of the light-duty Th350 and was particularly fitted to big applications with lots of torques. Even GMC and Chevrolet used it in their trucks until the ’90s, even after it was renamed -3L80. It was featured in cars like Ferrari, jeep, Roll Royce, Jaguars, etc. However, while it was used mainly by GM vehicles, it was also fitted to other cars. And it was primarily used by all GM applications in the ’60s and ’70s. The Th400 is a three-speed automatic transmission introduced by General Motors in 1964 to replace the ST300 2-speed automatic transmission. Just so if you are torn between which to choose between them, this guide will help you single out your choice. So in this article, I will explain both transmissions and their unique features and place the Th400 vs. However, while these two iconic transmissions differ in capabilities and features, translating to their uniqueness, they share few commonalities. Th350 is like putting two champions in a wrestling ring to fight. Hence, an excellent fit for both old and new cars. The Th400 and Th350 transmission are two GM transmissions that have been making waves since the ’60s.
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