The Most Complete Subframe System - Chris Alston's Chassisworks

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Fabricated Subframe with Integrated g-Machine Crossmemberg-Machine Subframe Welded AssemblyOur completely enclosed, welded subframe structure uses multiple sizes of mandrel-bent, boxedsteeltubing with fabricated components to optimize strength in key areas without unnecessarilyadding weight or decreasing clearance for engine and exhaust components; this is a result notpossible with simple straight-tube designs. Between the lower subframe mounting plate andg-Machine suspension crossmember, 4 x 2 x .120”-wall tubing is used to substantially increasestability and strength, enabling better control of engine torque and chassis flex than other 3 x 2”designs. Forward of the crossmember, 3 x 2 x .120”-wall tubing is reinforced by a fabricated framehorn, which broadens width to 3.25”, provides additional walls to greatly strengthen the forwardstrutGemini connector attachment area, and houses the bumper-bracket weld nuts. Enclosingthe frame horns and bridging the two rails together is the radiator-core-support crossmember.The factory core-support panel and grille center support simply bolt to the folded crossmember,improving upon the strength and quality of the OEM sheet metal component. Subframe rails,suspension crossmember, and various mounts are positioned and welded in a fixture. The finalfixture welding of the subassemblies ensures that firewall, motor, bumper, and core-supportmounts are perfectly positioned for a trouble-free installation. Completed base subframe assembliesare shipped as bare steel with sanded corner welds, ready for paint or powder coating.High-ClearanceForward StrutsUtilizesFactoryMountingLocationsBent-Tube,Billet-ComponentCrossmemberSecondaryRadiator-SupportCrossmemberGeminiConnectorSpecially ReinforcedFrame-Rail SectionPart NumberDescription7700 Base g-Machine Welded Subframe Assembly, ‘62-67 Chevy IIHigh-Clearance Forward StrutsTubular struts between the factory upper firewall mount and welded subframe’s Gemini connectortriangulate the front clip, virtually eliminating chassis deflection forward of the firewall. Firewallmountplates can be used with both 1962-65 or 1966-67 bolt patterns, and they utilize shims tofacilitate body panel alignment. Strut tubes are a stout 1-5/8 x .134”-wall and feature multiplemandrel bends to route the tubes tightly along the inner fender, providing more clearance aroundthe engine than other designs.4
Gemini Connector SystemOur in-house-engineered Gemini system isused to connect the strut to the subframe,enabling an easy-to-assemble, precision slipfitjoint that is substantially stronger than awelded joint. A broad-based, grooved, maleconnector is precisely positioned using slottabtechnology and then spray-arc weldedto a specially reinforced area of the forwardsubframe rail. The female tube adapter,welded to the end of the forward struts,features a dual-split-clamp design thatlocks around the male stem with the aid oftwo 5/16” socket-head cap screws. Onceassembled, the Gemini connector systemexerts a 1-1/8”-wide band of clamping forcecompletely around the male stem and firmlyFemaleTube AdapterMaleConnectorFastenerCounterboreDual-SplitClamp Design5/16” FastenersChamferedBase-Weld AreaChamferedTube-WeldAreaseats the 5/16” fasteners against the compression groove as the female adapter is drawn closed.Laboratory-conducted, destructive tests have shown that the tube itself will fail prior to damagingthe Gemini connector components.Single-Piece 4 x 2” g-Machine CrossmemberBent-tube, billet-componentcrossmembers are a completelyclosed, rigid structure with greaterstrength and resistance to bendingand twisting than other designs.Formed from a single piece of4 x 2 x .120” steel tubing, largeradiusmandrel bends are placedat each end to distribute loadsthroughout the crossmember,eliminating fatigue points at criticalareas. Slots for the billet-mounttabs are machined in a horizontalmachining center with dedicatedfixturing to guarantee correctcomponent geometry, ensuring thesuspension moves as designed.Locating features are machined into each crossmember to enable selfpositioningof billet components.Interlocking-Slot-Tab TechnologySelf-fixturing female slots used with machined male tabsprovide an interlocking assembly method that enablesA-arm, rack and pinion, and shock mounts to be accuratelypositioned in all axes. This guarantees the suspensionwill perform as designed. Non-interlocking designs arenot nearly as accurate after welding. Superior spray-arcwelding process produces the best weld penetration withexcellent appearance.Billet rack-and-pinion mount inserts intomachined slot on crossmember.5
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The Most Complete Subframe System - Chris Alston's Chassisworks

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