Convertible & Long Wheelbase Frames

Key Features - FAQ Classic Pickup: Key Features - FAQ Convertible Long Frames: Key Features - FAQ


Special Chassis Are Available For Convertibles & Long Wheelbase Cars
There are several key reasons why convertibles and long-wheelbase cars (over 118”) should use this chassis. In the case of convertibles, they essentially have no structure above the rocker panel and need extra rigidity to support the center of the body.


Special Chassis Are Available For Convertible & Long Wheelbase Cars
There are several key reasons why convertibles and long-wheelbase cars (over 118") should use this chassis. In the case of convertibles, they essentially have no structure above the rocker panel and need extra rigidity to support the center of the body.

Long-wheelbase cars have a similar issue with chassis flex, due to the torsional action of the stretched frame. To provide owners of convertibles, long wheelbase sedans and hardtops with the best possible ride and handling, the engineering team at Art Morrison Enterprises has developed a specially reinforced chassis that features 4"x4" main rails. This has been accomplished by merging the 2"x4" front subframe with a 4"x4"x .180" wall square tube main rail, resulting in remarkable rigidity in the area where an OEM frame is likely to flex.

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It's All About The Stance
Of course, "stance" is all-important with any custom vehicle. And Morrison can engineer the chassis to provide the exact ride height you desire. With the frame rails configured to the exact year/make/model vehicle, it's a fairly straightforward task installing the chassis. The 4x4 main rail chassis can be designed for use in both "unibody" and full-frame vehicles

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Thru Frame Exhaust
This chassis also features thru-frame exhaust passages, which allow your car to have a lower overall stance while still maintaining ample ground clearance.

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Key Features of Morrison's 4x4 Main Rail Chassis
CAD-Engineered to fit the exact year, make and model car. No compromises!

Your choice of ride height and stance

Superbly engineered suspension package provides vastly improved handling

Mandrel-formed 2"x4" front profile with a 4"x4"x3/16" main rail

Frame is fixture-welded to assure proper alignment of all suspension components

Choice of AME's own IFS, C6 Corvette or Air Spring-Plus front suspension

Triangulated 4-bar, 4-bar or Air Spring-Plus rear suspension options

Uses 20:1 Power Rack & Pinion steering

Strange coil-overs optional on all corners