Key Takeaways:
- Supporting Components Are Not Optional: A 4-inch lift on a 1966-77 Bronco requires an adjustable tracking bar, adjustable drag link, extended brake hoses, extended e-brake cables, and tall bump stops at a minimum.
- Sequence Matters From The Start: Front suspension work comes before rear installation, and geometry corrections must follow both before the vehicle is driven.
- Retorque After Break-In: All suspension hardware should be inspected and retorqued after the first 500 miles as new components settle under initial load.
A 4-inch lift is one of the most popular upgrades in the Early Bronco community, and for good reason. It adds meaningful ground clearance, improves trail capability, and transforms the stance of the build without pushing into the more complex geometry corrections required at 5.5 inches.
However, a lift kit is not a weekend bolt-on if it is done correctly. Here at TOMS OFFROAD we have been supporting 1966-77 Bronco suspension builds since 1976, and the suspension catalog covers everything from lift kits to the supporting hardware required at each height.
This guide covers how to install a 4-inch lift on a Bronco, what supporting components are required, and what checks must happen before the vehicle returns to the road or trail.
What A 4-inch Lift Actually Involves On The Early Bronco
Before touching a single bolt, it's important to understand what the 4-inch lift changes on the Early Bronco platform, and crucial to understand how to prevent the most common installation mistakes.
Understanding What Changes With A 4-inch Lift
A 4-inch suspension lift raises ride height through taller springs and changes the geometry relationships between the axle, frame, and body. Caster angle changes, driveshaft angles steepen, and the steering linkage shifts, each requiring a specific corrective component to address to ensure it is done correctly.
Supporting Components Required At This Lift Height
At 4 inches, the required supporting hardware includes an adjustable tracking bar, adjustable drag link, extended front and rear brake hoses, extended e-brake cables, and tall bump stops. Extended front and rear driveshafts and a drop pitman arm are also recommended at this height for full geometry correction.
4 Inch Lift Bronco Install — Tools And Prep Needed
A 4-inch lift bronco install requires a floor jack, rated jack stands, a torque wrench, basic hand tools, and a spring compressor for front coil work. Having all supporting components on hand before starting prevents the build from stalling mid-installation when a required part is missing.
Reading The Kit Instructions Before Starting
Our TOMS OFFROAD suspension lift kits include detailed installation instructions that should be read in full before any components are removed. Understanding the complete installation sequence from front to rear before starting prevents out-of-order work that adds unnecessary time to the build.
Early Bronco Lift Kit Install — Front Suspension Work
The front suspension installation sets the geometry foundation for the entire lift. Working through it systematically ensures correct component fitment before the rear is touched.
Removing The Factory Front Springs And Hardware
Safely support the front axle on jack stands with the weight off the springs before beginning removal. Disconnect the front track bar, sway bar end links, and radius arm hardware before lowering the axle to remove the factory front coil springs.
Installing New Front Springs And Radius Arm Brackets
Install the new taller front coil springs into the spring perches before raising the axle back into position. The Early Bronco lift kit installed at this height requires radius arm drop brackets or extended radius arms to correct the radius arm angle that the taller springs introduce.
Bronco Suspension Lift Guide — Tracking Bar And Drag Link
A Bronco suspension lift guide at the 4-inch level identifies the adjustable tracking bar and adjustable drag link as the two most critical corrective components for the front suspension. The factory tracking bar cannot accommodate lifted ride height and will pull the axle off-center, affecting both steering and tire clearance without correction.
Installing Extended Front Brake Hoses And Bump Stops
The extended front brake hoses replace the factory units that cannot accommodate the increased axle drop distance of 4 inches. Tall bump stops are installed in the factory bump stop location to prevent the suspension from compressing beyond what the driveshaft angles, which then allows the brake hose lengths to safely accommodate.
Rear Suspension Installation And Drivetrain Corrections
With front suspension work complete, the rear installation addresses the leaf spring pack, u-bolts, and the supporting components needed at this lift height.
Removing Factory Rear Leaf Springs
Support the rear axle on jack stands and disconnect the rear shock absorbers before removing the u-bolts that clamp the axle to the leaf spring pack. Lower the axle carefully to remove the factory leaf springs from their shackle and pivot mounting points on the frame.
Installing New Rear Springs And U-bolts
Install the new taller rear leaf springs in the factory mounting locations before raising the axle back up to meet the new spring pack. Use new u-bolts as specified alongside the lift kit installation Bronco process, as factory u-bolts should not be reused after removal from a classic Bronco.
Lift Kit Installation Bronco — Driveshaft And Geometry Checks
Lift kit installation procedures for the Bronco at 4 inches should include a rear driveshaft length check before the vehicle is driven. A rear driveshaft that is too short at the extended suspension droop can separate from the transfer case output under trail articulation, which is why extended driveshafts are highly recommended at this height.
Extended Rear Brake Hoses And E-brake Cable Installation
Extended rear brake hoses and extended e-brake cables are installed after the rear springs are in position and the axle is correctly located. These replace the factory units, as they cannot stretch to accommodate the increased axle drop distance at the lifted ride height without risk of hose damage or brake engagement restriction.
Post-install Checks, Geometry Corrections, And Parts Sourcing
With front and rear suspension installed, these final steps ensure the lift performs correctly and safely before the vehicle returns to the road or trail.
- Caster And Alignment Check After Install: A 4-inch lift changes the front axle caster angle and requires a professional alignment before extended road driving can begin.
- Shock Absorber Fitment At 4-Inch Height: Factory shocks are not correctly sized for a 4-inch lift height. At TOMS OFFROAD we carry shocks for the 1966-77 Bronco with shock height measurement guidance in our tech resource library to help you confirm correct dimensions.
- Retorque Intervals After First 500 Miles: All suspension hardware should be inspected and retorqued to specification after the first 500 miles, as new springs, seat, and fasteners settle under initial load.
- Sourcing Lift Kit Parts Through TOMS OFFROAD: At TOMS OFFROAD we have suspension lift kits for the 1966-77 Bronco from 2.5 inches to 5.5 inches, including all required supporting components, shocks, radius arm hardware, tracking bars, and associated hardware backed by a tech resource library with 76-plus installation guides.
A properly installed 4-inch lift paired with correct supporting components gives the Early Bronco the ground clearance it was built for on the trail.
Final Thoughts
A 4-inch lift on a 1966-77 Bronco is one of the most rewarding builds an enthusiast can complete in the garage. Done correctly with the right supporting components installed in the right sequence, it transforms the vehicle's trail capability without creating secondary problems from skipped geometry corrections.
We have been supporting Early Bronco suspension builds at TOMS OFFROAD since 1976, with lift kits, all required supporting components, shocks, and technical guidance covering every step of the installation process.
Every lift install deserves to be done once, done right, and built to last on the road and trail.
Frequently Asked Questions About How To Install A 4-inch Lift On My Bronco
What supporting components are required for a 4-inch lift on an Early Bronco?
An adjustable tracking bar, adjustable drag link, extended brake hoses, extended e-brake cables, and tall bump stops are required at a minimum for a 4-inch lift on an Early Bronco.
Does TOMS OFFROAD carry 4-inch lift kits for the 1966-77 Ford Bronco?
Yes. Suspension lift kits and all required supporting components for the 1966-77 Bronco are available in the TOMS OFFROAD suspension catalog.
Do I need extended driveshafts with a 4-inch lift on an Early Bronco?
Extended driveshafts are recommended at 3.5 inches and above. At 4 inches, checking actual driveshaft length before driving is strongly advised.
How do I choose the correct shocks for a 4-inch lift on a 1966-77 Bronco?
TOMS OFFROAD provides shock height measurement guidance in the tech resource library to confirm the correct extended and collapsed length for the lift height.
Why does a 4-inch lift require an adjustable tracking bar?
The factory tracking bar cannot be adjusted to re-center the axle at lifted ride height, causing steering pull and tire clearance issues without correction.
When should I retorque suspension hardware after a lift installation?
All suspension hardware should be inspected and retorqued after the first 500 miles as springs, seat, and fasteners settle under initial load.
