Calvert Racing CalTracs MX Traction Bar – Mopar B-Body (1966–1978) – Part #4220-MX
Fine-tune your launch geometry with the Calvert Racing CalTracs MX Traction Bar, engineered for Mopar B-body muscle cars. This advanced MX kit includes upgraded mounts, pivot plates, and hardware to help you achieve optimal bar angle—even on heavily modified drag builds. Featuring up to 12 adjustment positions, the MX system offers expanded tuning flexibility compared to standard kits and keeps the bar assembly above the rim line on 15" wheels for track safety compliance.
MX Kit Highlights
- MX 3-hole adjustable rear mounts and MX 4-hole pivot plates
- Upgraded 9/16” pivot bolts for added strength
- Assembly sits ½” longer than standard kits for improved geometry
- Rod ends now include grease zerks to reduce rattle and extend service life
- Chromoly preload link offers high strength with minimal flex
- ¾” Heim joints rated for over 14,000 lbs radial static load
- Two-piece aluminum front spring eye bushings maintain pivot alignment
- Rear mounts made from 5/16” mild steel for secure torque retention
- Black powder coated finish for corrosion resistance
What’s Included
- 2 MX Rear Mounts (may vary by application)
- 4 MX Pivot Plates
- 4 Heim Joints / Rod Ends
- 2 Force Transfer Links
- Shock Bolt Kit (required for this application)
- U-bolts for stock rear ends*
- All required mounting hardware
*If your rear end has been modified, contact Calvert Racing for correct U-bolt sizing.
Additional Notes
- MX kits are not compatible with truck platforms
- Kit is designed to work with your existing leaf springs
- Some applications may require additional hardware
- Includes full-color installation guide
- MX mounts and pivot plates also sold separately for upgrades
Why Choose CalTracs MX?
Since 1995, Calvert Racing has led the industry in leaf spring traction systems. The MX series was developed for racers who demand precision, durability, and maximum adjustability. Whether you're chasing ETs or refining your launch geometry, CalTracs MX delivers uncompromising performance from the starting line to the finish.
Vehicle Compatibility:
- 1970–1974 Dodge Challenger
- 1966–1973 Dodge Charger
- 1975–1978 Dodge Charger
- 1966–1976 Dodge Coronet
- 1970–1973 Plymouth Barracuda
- 1966–1970 Plymouth Belvedere
- 1965–1970 Plymouth Fury
- 1975–1978 Plymouth Fury
- 1967–1971 Plymouth GTX
- 1968–1973 Plymouth Road Runner
- 1966–1974 Plymouth Satellite
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
