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Ironworks Tri-5 Chassis Construction Information

The Tri-5 chassis built for the 1955-57 Chevrolet car is completely designed in Solidworks. Every part is laser cut and machined from part files created in the Solidworks program. The entire chassis is 100% Tlded for strength and weld quality. There is over 180 ft of TIG welding in this chassis and 160 ft of sanding to prep the rails to the end result you see as our product. The Ironworks Chassis is designed to be the strongest, lowest sitting chassis on the market with modern C6 Corvette based front suspension. We use only new parts on our chassis. Nothing is rebuilt or comes from any used parts. We strive to use the best parts possible. All parts are machined from the highest quality materials. 

Chassis description Photo

You can see how the front and rear section of the frame rails are joined together to create one solid rail piece. After the rails are joined together, the interior square gussets are installed to help with rail fixturing and to help the rail resist and twisting under load. On a custom Chassis, this main rail plate can be changed to a .1875" or 3/16" plate to improve chassis strength even further in high horsepower or convertible cars.

assembly pictures

As Chassis construction continues, you can see how every piece fits right into the piece next to it, precisely. Notice how the bulkhead plates hold each side plate that make up all 4 sides of the rail. Also notice how the crossmembers slide through the frame rail to precisely locate each crossmember. The crossmember tabs also slide completely through the rails to be welded on both sides of the rail and to help carry the load through the entire rail, not just one side. This also helps alleviate chassis flex.     

Chassis info pic 3

In this picture you can see the main rail design. You can see the middle plate is the continuous plate that extends from front to back in the chassis.  This is the plate that we can increase from .125 or 1/8" steel material to 3/16". But as the frame sweeps inward and up to the front crossmember it has 3 vertical plates for the transition.  This allows the frame to be 50% stronger and allows us to be able to shorten the beam height and create more ground clearance at a lower ride height.

Chassis info 4

Chassis info 5


 In this picture, you can see how the rear crossmember is tabbed and the frame is slotted to accept those tabs.  You can also see how the crossmember is slotted to accept the tabs from the rear upper link mounts. Not only does this type of chassis construction help add strength to the chassis but it also helps hold and locate every piece of the chassis precisely.  When making a big investment in a chassis, it is important that everything is perfectly square.  Our chassis is exactly that.

Chassis Info 6


You can see how the body mounts are also located on the chassis. They have long tabs to be welded to both sides of the entire rail. This precise positioning helps to alleviate the body mounts not being in an inprecise position.  

Chassis Info7