Throwback Thursday: Installation Of TCI 6X Automatic Overdrive

Well, here we are again. Another Thursday is already here. Ready or not, that means Friday is about to greet us again, and it’s time for another Throwback Thursday.

This week, we are taking a short trip back to July 2010, to check out, Installation of TCI 6X Six-speed transmission in project “MaxStreet” Chevy II. Adding overdrive transmissions to classic cars is nothing new, and increases drivability, making them more fun to drive.

automatic overdrive

The planetaries utilize Alto Red Eagle clutch packs, which are the very same material found in TCI’s ProX Turbo 400’s that are rated for 2,500-plus horsepower drag racing applications.

GM’s 4L80E transmission was developed in 1991, as the successor to the nearly indestructible Turbo 400. The 4L80E is a high-performance unit that in many ways, combines the attributes of the Turbo 400 and the 700R4/4L60E into a very strong, and flexible package. It offers the durability of the Turbo 400, with the additional benefit of an overdrive. Unfortunately for muscle car enthusiasts, the transmission was manufactured for use in Chevrolet and GMC pickup trucks, vans, SUVs, and commercial vehicles. Being built for heavy-duty use means the case is rather large and fitment into a classic car can be an issue.

However, in the original article, we showcase how TCI Automotive’s 6X six-speed is a viable alternative that fits. We’re told it is capable of handling 850 horsepower and uses the latest developments in drivetrain technology for use in Pro-Touring, street, and all-out race vehicles. It features six forward gears and fully programmable automatic or manual shifting for improved acceleration and fuel economy at cruising speeds.

automatic overdrive

The TCI 6X six-speed is electronically controlled through a transmission control box. Once a customer receives the unit, all that’s needed is input of the gears and tire sizes.

“Our goal was a strong Turbo 400-type transmission that would handle the horsepower and load but give customers the overdrive where they can cruise down the highway with a big motor,” stated Scott Miller of TCI. “We started toying around with it to see what we could do. Once we started talking to consumers that would potentially buy something like this, we found they wanted it. People wanted a six-speed that was an automatic, that was a lot more durable than the GM six-speeds, and they didn’t have to worry about a clutch.”

The article actually gets into the nitty-gritty of the transmission’s construction, benefits, and installation. Suffice to say, there’s a lot more in-depth insight into this informative article. That definitely makes it worthy of a second look. For that reason, I selected, Installation of TCI 6X Six-speed transmission in project “MaxStreet” Chevy II, as this week’s Throwback Thursday showcase article.

About the author

Randy Bolig

Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. His passion for performance got him noticed by many locals, and he began helping them modify their vehicles.
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