Calvert Racing CalTracs MX Traction Bar – Mopar B-Body w/ 3" Inboard Kit (1964–1975) – Part #4219-MX
Fine-tune your launch geometry with the Calvert Racing CalTracs MX Traction Bar, engineered for Mopar B-body platforms equipped with 3" inboard leaf spring kits. This advanced MX system includes upgraded mounts, pivot plates, and hardware to help you achieve optimal bar angle—even on modified drag builds. Featuring up to 12 adjustment positions, the MX kit offers expanded tuning flexibility compared to standard setups 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 and adjustability
- 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:
- 1974 Dodge Charger w/ 3″ inboard kit
- 1965 Dodge Coronet w/ 3″ inboard kit
- 1974 Dodge Polara w/ 3″ inboard kit
- 1965 Plymouth Belvedere w/ 3″ inboard kit
- 1964 Plymouth Fury w/ 3″ inboard kit
- 1974 Plymouth Road Runner w/ 3″ inboard kit
- 1975 Plymouth Road Runner w/ 3″ inboard kit
- 1965 Plymouth Satellite w/ 3″ inboard kit
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
