{"title":"Rear Suspension Parts","description":"","products":[{"product_id":"1965-73-mustang-rear-leaf-spring-set-multi-rls6573","title":"1965-73 MUSTANG, REAR LEAF SPRING SET (MULTI)(RLS6573)","description":"\u003cp\u003e\u003cstrong\u003ePerformance Online offers you a wide variety of options when considering what you want to do with your project vehicle.\u003cbr\u003e \n\u003cbr\u003e \nRestore your rear suspension with a set of our new replacement leaf springs.\u003cbr\u003e \n\u003cbr\u003e \nOur springs maintain the factory GVW and are available in stock height or 2\" drop.\u003cbr\u003e \n\u003cbr\u003e \nIncludes:\u003cbr\u003e \n• Leaf Springs\u003cbr\u003e \n• Limited Lifetime Warranty\u003cbr\u003e \n\u003cbr\u003e \nSold in pairs.\u003c\/strong\u003e\u003c\/p\u003e \n \n\u003cp\u003e\u003cstrong\u003e\u003cstrong\u003e\u003cspan style=\"color:#ff0000\"\u003eNOTE:\u003c\/span\u003e U-Bolts sold separately\u003c\/strong\u003e\u003cbr\u003e \n\u003cbr\u003e \nNote: Due to the oversize weight of this product, shipping price will vary. Please call for accurate shipping quote to your zip code. Due to the various optional ride heights available, all Multi leaf springs are built to order. Requires up to 2-4 weeks ship time. Springs are custom built, and will incur fees for any returns. No returns on altered springs.\u003c\/strong\u003e\u003c\/p\u003e \n","brand":"Performance Online (POL)","offers":[{"title":"Stock Height (RLS6573S)","offer_id":44022301982754,"sku":"RLS6573S","price":642.21,"currency_code":"USD","in_stock":true},{"title":"2\" Drop (RLS6573D)","offer_id":44022302015522,"sku":"RLS6573D","price":642.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/d-16310-962.jpg?v=1754067963"},{"product_id":"ford-chevy-and-chrysler-car-and-truck-front-and-rear-axle-shims-16851","title":"Ford, Chevy and Chrysler, Car and Truck, Front and Rear Axle Shims, 2\" Wide","description":"\u003cp\u003e\u003cstrong\u003eThese aluminum axle-pinion shims are a must when dialing in your suspension. For 2\" wide rear leaf spring setups, these items help correct your rearend to driveshaft angle and eliminate vibration during operation at all speeds. Misalignment is common on lowered and lifted vehicles making these shims a critical small tool. Degree required will vary depnding on the amount of drop or lift.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOur axle shims are also an important item when you have added power steering to your vintage straight axle front end. Original straight axle front ends came with minimal caster angle to make steering easier on the driver. When power steering is added, the caster angle must be increased or \"road wander\" becomes prevalent. This added with an old chassis design can become quite trying at high speeds. When using on straight axle trucks with power steering, we recommend the 6 degree shim.\u003cbr\u003e \u003cbr\u003eAvailable in 2°, 4° or 6°. \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions: Length 5.00\" Width 2.00\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLeaf spring centerbolts included!\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e Designed for 2\" leaf springs\u003c\/p\u003e","brand":"Western Chassis","offers":[{"title":"2 degrees","offer_id":44022410346530,"sku":"PS2002","price":28.69,"currency_code":"USD","in_stock":true},{"title":"4 degrees","offer_id":44022410313762,"sku":"PS2004","price":37.09,"currency_code":"USD","in_stock":true},{"title":"6 degrees","offer_id":44022410280994,"sku":"PS2006","price":46.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/PS175_600W-01.jpg?v=1754069449"},{"product_id":"1964-73-ford-mustang-caltrac-traction-bar-kit","title":"1964-73 Ford Mustang CalTrac Traction Bar Kit","description":"\u003cp\u003eTremendous benefits can be realized when our Cal-Trac traction bar system is installed on a leaf spring suspended 1964-73 Ford Mustang. Traction bars were developed to achieve specific goals to improve high power traction while staying within hard set NHRA parameters. The combination of these components change the pushing point on the car by redirecting the turning action (spring wrap-up) of the rear axle through the #2 Force Transfer Link into the #1 Front Pivot. (See detailed image). The front pivot spring stop resists this turning motion and also controls the bending of the leaf spring at it's thinnest section. The push into the Front Pivot helps the cars weight shift towards the rear of the car, because of new directed angle of force toward the front of the vehicle. (The 'Instant Center' moves further forward). This is where the system emulates a Four link system.\u003c\/p\u003e \n","brand":"Caltracs","offers":[{"title":"64-73","offer_id":44022688579618,"sku":"TBK6473","price":417.99,"currency_code":"USD","in_stock":true},{"title":"64-66 w\/8\" rearend","offer_id":44022688612386,"sku":"TBK64668","price":417.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/TBK0000b-04.png?v=1754074839"},{"product_id":"1965-73-ford-mustang-rear-leaf-spring-bushing-kit-poly-urethane","title":"1965-73 FORD MUSTANG, REAR LEAF SPRING BUSHING KIT, POLY URETHANE","description":"\u003cp\u003e\u003cstrong\u003ePoly Urethane bushings contain graphite for lubrication.\u003cbr\u003e\u003cbr\u003eIncludes rear end pads. (not shown)\u003cbr\u003e\u003cbr\u003eAvailable in either 1\/2\" shackle bolts or 9\/16\" shackle bolts.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Performance Online (POL)","offers":[{"title":"1965-66, 9\/16\" shackle bolts (6-1052)","offer_id":44022729965602,"sku":"6-1052","price":62.66,"currency_code":"USD","in_stock":true},{"title":"1965-73, 1\/2\" shackle bolts (6-1051)","offer_id":44022729998370,"sku":"6-1051","price":60.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/t-17936-1331.jpg?v=1754075578"},{"product_id":"1964-73-ford-mustang-leaf-spring-heavy-duty-shackle-bushing-set-poly-4-2136g","title":"1964-73 FORD MUSTANG, LEAF SPRING HEAVY DUTY SHACKLE BUSHING SET (POLY)(4-2136G)","description":"\u003cp\u003e\u003cstrong\u003eOEM replacement.\u003cbr\u003e\u003cbr\u003eReduces wheel hop in acceleration, prevents shudder under braking \u0026amp; delivers greater handling control.\u003cbr\u003e\u003cbr\u003eGreat for vehicles with high performance tires and horsepower upgrades.\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Performance Online (POL)","offers":[{"title":"Default Title","offer_id":44022873292834,"sku":"4-2136G","price":100.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/t-18270-1329.jpg?v=1754077665"},{"product_id":"1964-70-ford-mustang-4-link-suspension-kit","title":"1964-70 Ford Mustang 4-Link Suspension Kit","description":"\u003cp\u003e1964-70 Ford Mustang Rear 4-Link suspension kit for maximum performance from your first generation Mustang. These kits include a full upper coilover crossmember for added strength and include adjustable links for tuning your suspension.\u003c\/p\u003e \r\n","brand":"Heidts","offers":[{"title":"Standard \/ MUSTANG 4 LINK, USE WITH 9″ HOUSING, 3.00″ TUBE","offer_id":44023075766306,"sku":"RSF6470-01","price":2063.0,"currency_code":"USD","in_stock":true},{"title":"Standard \/ MUSTANG 4 LINK, USE WITH 8″ HOUSING, 2.30″ TUBE","offer_id":44023075799074,"sku":"RSF6470-02","price":2063.0,"currency_code":"USD","in_stock":true},{"title":"Standard \/ MUSTANG 4 LINK, USE WITH 9″ HOUSING, 2.80″ TUBE","offer_id":44023075831842,"sku":"RSF6470-03","price":2063.0,"currency_code":"USD","in_stock":true},{"title":"Standard \/ 1964-70 MUSTANG 4 LINK FOR MINI TUBS","offer_id":44023075864610,"sku":"RSF6470-04","price":2153.0,"currency_code":"USD","in_stock":true},{"title":"Billet shock w\/ coils \/ MUSTANG 4 LINK, USE WITH 9″ HOUSING, 3.00″ TUBE","offer_id":44023075930146,"sku":"RSF6470-01C","price":2271.2,"currency_code":"USD","in_stock":true},{"title":"Billet shock w\/ coils \/ MUSTANG 4 LINK, USE WITH 8″ HOUSING, 2.30″ TUBE","offer_id":44023075962914,"sku":"RSF6470-02C","price":2271.2,"currency_code":"USD","in_stock":true},{"title":"Billet shock w\/ coils \/ MUSTANG 4 LINK, USE WITH 9″ HOUSING, 2.80″ TUBE","offer_id":44023075995682,"sku":"RSF6470-03C","price":2271.2,"currency_code":"USD","in_stock":true},{"title":"Billet shock w\/ coils \/ 1964-70 MUSTANG 4 LINK FOR MINI TUBS","offer_id":44023076028450,"sku":"RSF64701-04C","price":2372.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/d-18618-475-01.jpg?v=1754080512"},{"product_id":"1964-73-ford-mustang-split-mono-leaf-springs","title":"1964-73 Ford Mustang Rear Split Mono Leaf Springs","description":"\u003cp\u003e\u003cstrong\u003eOur 1964-73 Ford Mustang Split-Mono leaf springs are complete with solid aluminum bushings in the front eyes and poly-urethane bushings in the rear eyes for minimal deflection. The Split-Mono leaf spring overlaps 12\", extending 6\" on each side of the axle tube. The overlap extends over the high stress area of the spring emulating a parabolic type spring.\u003cbr\u003e \n\u003cbr\u003e \n• Split-Mono leaf springs made to work in conjuction with our traction bars.\u003cbr\u003e \n\u003cbr\u003e \n• 200lb. - 225lb. Spring Rate\u003cbr\u003e \n\u003cbr\u003e \n• Ride height options are stock and 1\" lowered.\u003cbr\u003e \n\u003cbr\u003e \n• Substantially lighter than multi-leafs for unsprung weight savings.\u003cbr\u003e \n\u003cbr\u003e \n• Heavy duty alignment spring pins \u0026amp; clamps.\u003cbr\u003e \n\u003cbr\u003e \nKit includes:\u003cbr\u003e \n• Leaf Springs (pair)\u003cbr\u003e \n• New front eye bushings\u003cbr\u003e \n• All Hardware\u003cbr\u003e \n• Limited Lifetime Warranty \u003c\/strong\u003e\u003c\/p\u003e \n \n\u003cp\u003e\u003cstrong\u003eSold as a Pair.\u003c\/strong\u003e Due to the nature of these springs, requires center bolt modifications \u0026amp; grinding to fit.\u003cbr\u003e \n\u003cbr\u003e \nProduct fits: 1964, 65, 66, 67, 68, 69, 70, 71, 72, 73 Ford Mustang\u003c\/p\u003e \n","brand":"Caltracs","offers":[{"title":"Stock","offer_id":44023192387618,"sku":"RSMS6473S","price":460.0,"currency_code":"USD","in_stock":true},{"title":"1\" drop","offer_id":44023192420386,"sku":"RSMS6473D","price":460.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/Calvert-Monos_600W_3a5d176c-e69c-4758-b408-34fe4820a508.jpg?v=1754083145"},{"product_id":"1964-73-ford-mustang-rear-axle-seats-pair-ras6473","title":"1964-73 FORD MUSTANG, REAR AXLE SEATS (PAIR)(RAS6473)","description":"\u003cp\u003eMade of 1018 cold roll steel, these items not only make for a cleaner installation, they have locating holes to help maintain proper rear axle alignment!\u003c\/p\u003e \r\n","brand":"Performance Online (POL)","offers":[{"title":"Default Title","offer_id":44023271653410,"sku":"RAS6473","price":23.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/RAS5557_500W-04_48770830-1dbc-4e59-b67b-f4deeb536e67.jpg?v=1763509652"},{"product_id":"1964-73-ford-mustang-upgrade-u-bolt-kit","title":"1964-73 Ford Mustang Upgrade U-bolt kit","description":"\u003cp\u003e\u003cstrong\u003eOur 1964-73 Ford MustangU-bolt kits are a great way to complete your chassis restoration. These high grade items are stronger than the originals.\u003cbr\u003e \r\n\u003cbr\u003e \r\nWe recommend replacing your U-bolts whenever you replace or change your leaf springs.\u003cbr\u003e \r\n\u003cbr\u003e \r\nKit includes:\u003cbr\u003e \r\n• 4 U-bolts (Zinc coated for corsion resistance)\u003cbr\u003e \r\n• Nuts and Flat Washers\u003c\/strong\u003e\u003c\/p\u003e \r\n \r\n\u003cp\u003e\u003cstrong\u003eManufactured in the US using hi-quality Grade 8 material\u003c\/strong\u003e\u003c\/p\u003e \r\n \r\n\u003cp\u003e \u003c\/p\u003e \r\n \r\n\u003cp\u003eU-Bolt Torque Recommendations\u003c\/p\u003e \r\n \r\n\u003ctable border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"width:600px\"\u003e \r\n\t\u003ctbody\u003e \r\n\t\t\u003ctr\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e\u003cstrong\u003eThread Size \u0026amp; Nut Hex Size\u003c\/strong\u003e\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e\u003cstrong\u003eMax Torque (ft lbs.)\u003c\/strong\u003e\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\u003c\/tr\u003e \r\n\t\t\u003ctr\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e1\/2 (3\/4 Hex)\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e90-95\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\u003c\/tr\u003e \r\n\t\t\u003ctr\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e9\/16 (7\/8 Hex)\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e120-130\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\u003c\/tr\u003e \r\n\t\t\u003ctr\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e5\/8 (15\/16 Hex)\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e170-180\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\u003c\/tr\u003e \r\n\t\t\u003ctr\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e3\/4 (1-1\/16 Hex)\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\t\u003ctd style=\"height:26px\"\u003e \r\n\t\t\t\u003cp\u003e275-300\u003c\/p\u003e \r\n\t\t\t\u003c\/td\u003e \r\n\t\t\u003c\/tr\u003e \r\n\t\u003c\/tbody\u003e \r\n\u003c\/table\u003e \r\n \r\n\u003cp\u003eProduct fits: 1947 48 49 50 51 52 53 54 55 Chevy Truck, GMC truck\u003c\/p\u003e \r\n½-20 X 3” X 9” \r\n","brand":"Performance Online (POL)","offers":[{"title":"Default Title","offer_id":44023272144930,"sku":"UBK6473","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/UBK6781_500W-03_77b7a5a4-aac6-4559-bc26-94db54f00c57.jpg?v=1754085291"},{"product_id":"leaf-spring-lowering-block-kit-extruded-aluminum","title":"Leaf Spring Lowering Block Kit, Extruded Aluminum","description":"\u003cp\u003eOur ultra lightweight extruded aluminum lowering blocks are available in 1\", 2\" and 3\" heights. These blocks will increase or decrease suspension height on most sport truck and classic car leaf spring applications. Can be installed under the leaf spring to lift vehicle or on top of leaf spring to lower the vehicle. All kits include zinc plated grade 8 ubolts. \u003c\/p\u003e\n\u003ch3\u003eVideo: How To Install Rear Lowering Blocks\u003c\/h3\u003e\n\u003cdiv class=\"video-container\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/QGsSfvjmkrg\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e","brand":"Performance Online (POL)","offers":[{"title":"1\" drop","offer_id":44023272865826,"sku":"PO2031","price":47.29,"currency_code":"USD","in_stock":true},{"title":"2\" drop","offer_id":44023272898594,"sku":"PO2032","price":55.58,"currency_code":"USD","in_stock":true},{"title":"3\" drop","offer_id":44023272931362,"sku":"PO2033","price":63.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/POL203_250W.jpg?v=1754085308"},{"product_id":"cal-tracs-traction-bar-adjustable-wrench","title":"Traction Bar Adjustable Wrench","description":"Cal Tracs Traction Bar Adjustable Wrench\n(2) Wrenches - 1-1\/8\"\n1-1\/8\" opening for adjusting links and jam nuts\n6\" handle features an offset\/angled head that helps in low clearance applications","brand":"Caltracs","offers":[{"title":"Default Title","offer_id":44024314331170,"sku":"WR-01","price":65.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/files\/null_img_937b8096-73b3-4ccf-87dd-a5cb54ba1953.jpg?v=1761595172"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0811\/7642\/8578\/collections\/POL-Suspension-Parts_05c3a74a-60cb-4306-9e3b-07095685ec5a.jpg?v=1756563364","url":"https:\/\/www.performanceonline.com\/collections\/rear-suspension-parts-64-73-mustang.oembed","provider":"Performance Online","version":"1.0","type":"link"}