{"product_id":"chassis-engineering-bolt-on-rear-end-kit-for-1937-39-chevy-car","title":"1937-39 Chevy Car Bolt-On Parallel Rear Leaf Spring Kit - Chassis Engineering","description":"\u003cp\u003eThe \u003cb\u003e1937–1939 Chevy Car Bolt-On Parallel Rear Leaf Spring Kit (AS-1018CG)\u003c\/b\u003e by Chassis Engineering converts classic Chevrolet passenger cars to a modern, parallel leaf spring suspension. Engineered as a direct bolt-on system, this kit replaces outdated factory rear setups and open-driveline conversions with smooth-riding 2-1\/2\" slider springs and matched gas shocks.\u003c\/p\u003e\n\u003cp\u003eAccommodating axle housing tube diameters up to 3\", this kit is compatible with popular modern rear axle swaps (such as Ford 8-inch, Ford 9-inch, and GM 10\/12-bolt axles) and is designed around a recommended 58\" rear track width.\u003c\/p\u003e\n\u003ch3\u003eKey Features \u0026amp; Design Highlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eVehicle-Specific Bolt-On Frame Brackets:\u003c\/b\u003e Uses factory frame alignment points for 1937–1938 models, with specific placement guidance (47-1\/2\" measurement) for 1939 frames.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e2-1\/2\" Rear Slider Leaf Springs:\u003c\/b\u003e Features wide, smooth-riding parallel slider springs with high-vibration-absorbing rubber bushings for improved ride quality and reduced road noise.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eAdjustable Upper Shock Crossbar:\u003c\/b\u003e Transverse upper shock bar mounts cleanly between frame rails, allowing proper clearance below the floor pan.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eReversible Lower Shock Plates:\u003c\/b\u003e Multi-angle lower plates can be oriented with the shock stud angled up (standard ride height) or down (lowered stance\/lowrider applications).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eGas-Charged Damping:\u003c\/b\u003e Paired with matched gas shock absorbers to control body roll and suspension movement under load.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specification Matrix\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature \/ Metric\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eTechnical Specification Detail\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eManufacturer \u0026amp; Part #\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eChassis Engineering (P\/N: AS-1018CG)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eVehicle Application\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1937, 1938, and 1939 Chevrolet Passenger Cars\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eRecommended Rear Track Width\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e58.00\" Wheel Mount Face Width\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eMax Axle Housing Tube Size\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to 3.00\" Diameter Axle Tubes\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eLeaf Spring Dimensions\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2-1\/2\" Wide Parallel Slider Springs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eShock Damping Type\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGas-Charged Shock Absorbers Included\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eEye-to-Eye Mounting Distance\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e47-1\/2\" Mount Alignment Center\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003ePackaging Configuration\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eShips complete across 3 separate boxes\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eStep-by-Step Installation Summary\u003c\/h3\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eTeardown \u0026amp; Front Mount Positioning:\u003c\/b\u003e Remove factory rear end, leaf springs, shocks, and rivets. Clamp new front mounts to the frame, using line-up holes. Temporarily bolt the axle and wheels\/tires to visually confirm tire centering in the fender opening before final drilling.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eRear Mount Installation:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e1937–1938 Models:\u003c\/b\u003e Align using factory rivet holes, drill out to 3\/8\", and bolt in place.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e1939 Models:\u003c\/b\u003e Measure back 47-1\/2\" from the front mount center to establish the rear mount location.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSpring \u0026amp; Shackle Hang:\u003c\/b\u003e Bolt front leaf spring eyes using factory-style rubber bushings, insert rear shackles, align suspension geometry, and complete final frame drilling for all mounting bolts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eUpper Shock Crossbar Mounting:\u003c\/b\u003e Position the upper shock tube between frame rails (approx. 38\" reference measurement). Ensure the floor pan does not contact the bar to prevent cabin rattles, then drill 3\/8\" frame holes and bolt secure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eAxle Mounting \u0026amp; Lower Plates:\u003c\/b\u003e Set the rear axle housing over the spring center pin. Install U-bolts, spring pads (using the center bolt spacer for GM\/Nova axles or removing if unneeded), lower shock plates with studs facing inward\/forward, and gas shocks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eFinal Inspection \u0026amp; Clearance Checks:\u003c\/b\u003e Verify all fasteners are torqued. Ensure suspension travel bottoms out on frame\/axle snubbers and not inside the shock absorbers to prevent shock failure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cblockquote\u003e\n\u003cp\u003e🛠️ \u003cb\u003eImportant Tech \u0026amp; Break-In Notes:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSpring Settling:\u003c\/b\u003e New leaf springs will naturally drop up to 1\" during the first 500 miles of use. Depending on total vehicle weight, springs sitting flat or slightly reversed under load is normal operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eRubber vs. Hard Bushings:\u003c\/b\u003e Rubber bushings are specifically required to absorb road vibrations, reduce harmonic noise, and allow necessary torsional flex during suspension travel. Hard polyurethane or solid bushings are not recommended.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eFrame Protection:\u003c\/b\u003e Always install adjustable rubber frame snubbers\/bump stops so bottoming-out forces hit the rubber stops rather than over-compressing the shock absorbers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e","brand":"Chassis Engineering","offers":[{"title":"No","offer_id":52592385982596,"sku":"CEI AS-1018CG","price":1102.0,"currency_code":"USD","in_stock":true},{"title":"Yes","offer_id":52592386015364,"sku":"CEI AS-1018CG \/ SB-1037RA","price":1356.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0286\/1180\/5316\/products\/AS-1018CG__26339.1610653999.1280.1280.jpg?v=1621999108","url":"https:\/\/hotrodhardware.com\/products\/chassis-engineering-bolt-on-rear-end-kit-for-1937-39-chevy-car","provider":"Hot Rod Hardware","version":"1.0","type":"link"}