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LeafspringsSplit Mono Leafsprings/pair Stock Height (640-34)
1964-1965 Ford Falcon
1964-1973 Ford Mustang
SPLIT MONO LEAFSPRINGS, PER PAIR
Tested on the fastest stock suspension cars in the world, Calvert’s Split Mono Leafsprings are designed to control and reduce excessive body separation in rear suspension and plants the rear tires without unloading.
All of Calvert Racing’s Split Mono Leafsprings are assembled to order with grade 8 hardware and heavy-duty alignment clamps. Aluminum bushings are pressed into the front spring eyes and polyurethane bushings in the rear spring eyes, these springs have been proven to withstand over 2,500 HP at ¼ mile ETs in the 6s.
NOTE: Calvert Racing Springs are designed for DRAG RACING and have a higher spring rate / stiffer ride than stock springs. Spring halves are dipped in black paint before assembly, but some raw steel may show due to deburring/grinding sharp edges.
Calvert Split Mono Leafsprings are designed to work with CalTracs to maintain arch. While street driving does not put undue stress on the springs, racing with Calvert springs without a traction device installed may result in bent or de-arched springs.
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CalTracs - Standard
CalTracs Standard Low Pro (6801)
THIS KIT INCLUDES LOW PROFILE (1 Hole) PIVOT PLATES.
Low Profile allows approx. 1.5″ more ground clearance for vehicles used for every day street driving.
1967-1973 Mercury Cougar
Rod Ends/Heim Joints NOW COME WITH GREASE ZERKS. Add a small amount of grease to reduce chatter.
Designed by Race legend John Calvert. Bolt On traction system. Full pre-load adjustability, keeps axle from rotating/maintains pinion angle, improves 60′ times. Black powder coated for durability. Standard and Low Pro pivot plates available.
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Specializing in leaf spring traction systems since 1995, the Calvert Racing Team knows what it takes to get your car hooking harder than ever. Designed by racers for racers, CalTracs boasts unsurpassed quality and craftsmanship; the competition is eliminated right off the starting line. The preload link is made with Chromoly, lightweight but strong, ensuring maximum leverage and minimum flex. ¾” Rod Ends have a radial static load capacity of over 14,000 pounds. Two-piece aluminum front spring eye bushings assembly keeps the front pivot squared and rigid. The rear mounts are made with 5/16” mild steel to withstand the correct torque on your u-bolts, keeping the rear end from moving.
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NOTE: Part #2301 shown. Your final product may vary from photo depending on your application. Some applications require additional hardware. U-bolts NOT included in the kit but are available if desired.FULL COLOR INSTALLATION GUIDE INCLUDED.
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CalTracs - Trucks
CalTracs Truck (7310)
2015-2025 Ford Raptor
2015-2025 Ford F-150
NOTE: Will NOT fit 2026 models!
Designed especially for trucks, axle BELOW springs. Bolt On traction system. Full pre-load adjustability, keeps axle from rotating/maintains pinion angle, eliminates spring wrap up, improves 60′ times. Black powder coated. Berlin-style pivot plates for most applications.
Specializing in leaf spring traction systems since 1995, the Calvert Racing Team knows what it takes to get your truck hooking harder than ever whether you’re drag racing, sled pulling or just towing. Helps eliminate wheel hop. Designed by racers for racers, CalTracs boasts unsurpassed quality and craftsmanship; the competition is eliminated right off the starting line. The preload link is made with Chromoly, lightweight but strong, ensuring maximum leverage and minimum flex. HD Rod Ends have a radial static load capacity of over 14,000 pounds. Two-piece aluminum front spring eye bushings assembly keeps the front pivot squared and rigid. The rear mounts are made with 5/16” mild steel to withstand the correct torque on your u-bolts, keeping the rear end from moving.
FULL COLOR INSTALLATION GUIDE INCLUDED.
NOTE: Your final product may vary from photo depending on your application. Some applications require additional hardware.
This kit requires and INCLUDES a set of square u-bolts.
SQUARE U-BOLTS (spring OVER axle): Calvert Racing’s square u-bolts are 9/16″ ” diameter. We recommend torqueing truck/square u-bolts to 90-100 foot lbs. After running the vehicle down the track a few times, we also recommending checking the u-bolts and readjusting if necessary. Please see FAQ page or CalTracs Installation Guide for more info.
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CalTracs Pivot Plates
CalTracs HD Pivot Plates, 3 hole (PL-0523)
SET OF FOUR PLATES
Designed for LIFTED RACING TRUCKS. Three Hole, Berlin style plates for center spring eye. Made with 5/16″ Mild Steel, black powder coated for added durability. 6.5″ long, measured from center of spring eye to bottom of plate.
IMPORTANT: INCLUDE YEAR, MAKE AND MODEL IN THE CUSTOMER NOTES SECTION SO WE MAY VERIFY THE CORRECT PARTS ARE SENT.
NOTE: It is recommended that you use the hole that allows the traction bars to be most parallel to the ground when your vehicle is fully loaded, weight on tires.
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Accessories
HD SPRING CLAMPS/set of 2 (SCH-10)
HEAVY DUTY CLAMPS FOR 2.5″ SPRING, 1″ deep
Heavy duty steel, zinc coated spring clamps designed for Calvert Racing’s Split Mono Leafsprings. Includes two clamps, 2 bolts, 2 limiting tubes, and rivets. Rivets are designed to be pressed into spring hole to secure.
These clamps require a chamfered 3/8″ hole be drilled into the leaf for the rivet to be inserted and pressed to secure. NOTE: Back of spring , drill/chamfer the bottom spring. For the front of the spring, drill/chamfer the top spring.
Be sure to measure your springs to make sure the clamps will fit.
SCH-10 shown.
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Lifestyle
Limited Edition 2022 Calendar (LS-CAL22)
Makes a GREAT GIFT for the racing or car enthusiast.
Custom designed by Calvert Racing and printed locally, these colorful, high quality glossy wall calendars feature photos from twenty-four actual Calvert Racing customers. Every month features a photo of a new vehicle, plus a special double CENTERFOLD CLASSICS page! Date blocks offer plenty of room for notes, U.S. Holidays are indicated as well.
SIZE: 8.5″ x 11″ folded, 11″ x 17″ hanging, drilled hole for hanging.
USA SHIPPING: IF YOU ARE ONLY ORDERING CALENDARS (NO OTHER PRODUCTS IN YOUR CART), PLEASE CALL US DIRECTLY TO RECEIVE THE BEST MAILING RATE. 661-728-9600, Monday-Friday, 8am-4:30pm Pacific Standard Time.
SPECIAL PRICE: The price is less than actual printing costs. Very limited number available, when they’re gone, they’re gone!
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Accessories
ALUMINUM BUSHING/SET (BK-22)
1963-1967 Chevrolet Nova
1963-1967 Chevy II
Kit includes two aluminum bushings and 2 steel inserts for FACTORY leafspring front spring eye.
If you need replacement bushing for Calvert Springs, please call us directly.
(BK-34 shown)
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CalTracs Links
CalTracs Force transfer Links/pair- 23.5″ (L210-235-270)
SET OF TWO
1.25″ diameter x 23.5″ force transfer links. Measure end to end. Can be lengthened 3/4″ each end by turning once installed.
Made with 4130 Chromoly, the CalTracs preload link is light weight but strong, ensuring maximum leverage and minimum flex. Gloss black powder coated for added durability.
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CalTracs Pivot Plates
CalTracs HD Monster Pivot Plates, 4 hole (PL-0524)
SET OF FOUR MONSTER PLATES
Designed for LIFTED OR MONSTER RACING TRUCKS. Four Adjustment Holes for maximum adjustability.
Berlin style plates for center spring eye. Made with 5/16″ Mild Steel, black powder coated for added durability. 8″ long, measured from center of spring eye to bottom of plate.
IMPORTANT: INCLUDE YEAR, MAKE AND MODEL IN THE CUSTOMER NOTES SECTION SO WE MAY VERIFY THE CORRECT PARTS ARE SENT.
NOTE: It is recommended that you use the hole that allows the traction bars to be most parallel to the ground when your vehicle is fully loaded, weight on tires.
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