1955-57 CHEVY DIRECT-REPLACEMENT CHASSIS

Our new Big-Block (and small block) Generation IV direct replacement, jig-built, mandrel-bent, performance-street chassis is now available for 1955-57 Chevys with any options available for tri-five Chevys! This is the fourth version of our tri-five chassis since we started building them in 1993! This is also the strongest version! Of course it will handle mouse motors, but we designed and built this chassis to handle lots of big-block power and torque! It utilizes all stock body-mounts, inner-fender panels (without modifications), stock core-support, and bumper bracket mounts, all in their stock locations! We offer the chassis in either right-or-left hand drive for convertible or sedan bodies. All of our new G-4 chassis now have the larger 2X4 box tube X-member that  gives extra strength for the delicate convertible bodies and will take all the torque you can fit under the hood. You will see in the following photos that the new larger 2X4 box tube X-member connects directly to the rear 4-link crossmember to put all the power to the ground.

The standard chassis package features 2 X 4 X .120-inch wall box tube mandrel-bent chassis. It has an additional 1-inch step over the front suspension and a 1 1/2-inch additional step over the rear suspension. To accommodate the lower chassis, the engine mounts have been raised for increased ground clearance for headers and oil pan. Either big block or small block engines can be used with the stock rear-sump oil pan. The engine mounts have been moved forward slightly to install the larger distributor cap of the popular HEI GM ignition without cutting into the stock firewall.

The stock 115-inch wheelbase G-4 chassis features our new 2X4 box-tube X-member, a vast improvement over the stock chassis that has only two crossmembers! The new stronger and more exhaust friendly chassis features 1 1/4-inch X .120-inch wall D.O.M. support tubes to add additional strength to the crossmember and frame rails as they step over the front suspension. Instead of side-chassis motor mounts, we've designed new 1 1/4-inch X .120-inch wall D.O.M. support tubes that connect between the inner frame-rail sides and the front crossmember that hold stock GM motor mounts. This gives additional support to the front crossmember and the chassis rails for plenty of big block power. Notice, our new transmission crossmember has also been designed to be more exhaust friendly, and each bracket features all the holes for the six most popular GM transmissions (GM 4-speed, GM 6-speed, Turbo 350, 400, 700R4 and PowerGlide).

At the rear of the chassis, you'll notice we've changed the way our tubular crossmembers attach to the rails. We no longer weld the crossmembers to the inside of the chassis rails, only. The two 1 3/4-inch X .120-inch wall D.O.M. tubular crossmembers that actually go all the way through the chassis and are welded on the inside and the outside of the chassis rails are the forward 4-link crossmember and the crossmember over the rearend. This allowed us to hide the rear antisway bar inside the tubular crossmember over the rearend. The new through-frame design adds additional strength to the forward 4-link crossmember, where the torque is transferred to the tires and the road. This is where we changed our design. We now have the super strong center box-tube X-member connected to the forward 4-link thru-frame crossmember so you can put the pedal to the metal with a smile on your face!

We also have a new Panhard rod design behind the rearend housing. The new longer and lower Panhard rod is now parallel with the axle housing which lowers the actual roll-center of the chassis. We call this our Low Roll-Center Panhard bar. The IFS (alignable at any GM dealer or frontend shop) features an 11-inch GM disc-brake package utilizing '67-72 Chevelle front-steer spindles with bolt-on steering arms, 11-inch GM rotors (retaining your stock 5-on-4 3/4 wheel bolt-pattern), GM calipers (2 15/16-inch diameter piston), and GM balljoints. The 2 X 4 X .188-inch wall box-tube front crossmember holds D.O.M. steel tube 1 1/4-inch od X .156-inch wall lower A-arms and 1-inch od X .156-inch wall D.O.M. steel tube upper A-arms. A '79-93 Mustang manual rack-and-pinion steering unit connects the front steer spindles. Aluminum coilover shocks are standard items on our tri-five chassis, however we have optionsal adjustable coilover shocks that adjust either rebound or compression or both. With the twist of a knob, these adjustable coilovers are the only way to go if you like to "tune" your suspension front and rear.

We are the only chassis manufacturer in the industry that gives you a 4-corner adjustable stance chassis as a standard feature! The upper IFS tower has a multi-position adjustable upper coilover or air bag mount for about 4-inches of travel and a two position lower front coilover mount in the lower A-arm.  At the rear we offer either a 3-position Street Rod style adjustable mount for coilovers or ShockWave rear bags or our multi-position Drag Race style rear coilover of ShockWave rear mount. This all adds up to about 3-5-inches of adjustable front-and-rear stance that is right for you!

Your options are limitless! Some of the most popular are tubbing, custom front or rear track width, dropped spindles, 1-inch diameter front antisway bar or 3/4-inch diameter NASCAR style Thru-frame rear antisway bar, 12-inch GM front disc brakes, or high performance Baer or Wilwood disc brakes with drilled or ball milled rotors front-and-rear, Explorer rear disc, (most packages include rear parking brake) '83-92 T-Bird power steering, and power brakes. Air Ride Technologies ShockWave air suspension system front-and-rear complete with remote operating system, onboard pump, tank gauges/switches, solenoid pack, and suspension bump stops are also optional. Optional rearends include Alston's FAB9, Winters quick-change, Championship style quick-change, new Currie 9-inch style housing. Our 9-inch rearends feature all new parts including new flanges, new 3-inch diameter axle tubes, new center housing, new optional Dutchman alloy axles and your choice of optional rear disc brake kits. All rearends are available with gears, axles, bearings, brakes and seals at an additional cost.