Secure Checkout

Flex-Master 4-inch Lift Leaf Springs, 78-96 Ford Bronco, 73-96 Ford F150 SKU: 791140

Flex-Master 4-inch Lift Leaf Springs, 78-96 Ford Bronco, 73-96 Ford F150

Flex-Master 4-inch Lift Leaf Springs, 78-96 Ford Bronco, 73-96 Ford F150

Purchase Flex-Master 4-inch Lift Leaf Springs, 78-96 Ford Bronco, 73-96 Ford F150
$599.98 SKU: 791140
Fits 78-79 Ford Bronco, 73-96 Ford F150
2 Reviews

Product Overview:

Flex-Master leaf springs are designed for strength, flexibility, and practical spring function whether on the street or off-road. Full size Ford 4 inch lifted leaf springs. Fit 1978 and 1979 Ford Broncos. Also fits 1973-96 Ford F150 4WD. Guaranteed the best leafs for your full-size Ford.

Full description

Flex-Master leaf springs are designed for strength, flexibility, and practical spring function whether on the street or off-road. Full size Ford 4 inch lifted leaf springs. Fit 1978 and 1979 Ford Broncos. Also fits 1973-96 Ford F150 4WD. Guaranteed the best leafs for your full-size Ford.

Flex-Master Leaf Springs Pair 4inch 7-Pack for 78-96 Bronco and 73-96 F150 4WD
View the second image above to see the following features of our leaf spring. We were after three things when we designed our Flex-Master leaf springs. First, strength is very important so we chose a nine leaf spring ( 1 ) with Berlin eyes ( 2 ) on both ends and we upgraded to a 7/16" center pin ( 3 ). We have found the stock 3/8" pins inadequate for today's wheeling. Slight clearancing on the stock spring wedge is necessary with the new center pins.

Next, we wanted flexibility. This is achieved by the progressive design. We have also added UHMW polyethylene tip inserts ( 4 ) to provide separation for less friction and smoother operation.

Lastly, practical spring function is enhanced with a double wrap front eye ( 6 ) for safety. We included a flat mounting surface ( 7 ) which allows for a non-preloaded installation and proper match to axle mounting surface. Strategically located riveted bolt clips ( 8 ) are used to keep springs in line and assist in dampening axle wrap.

As is the industry standard, your leaf springs will arrive unboxed with the shipping label taped directly to the springs. Optionally, though not necessary, you can perform a quick clean-up with a can of satin black spray paint prior to installation to address any paint chips. Original springs were typically bare steel and have served for decades without touch-ups.
Review Flex-Master 4-inch Lift Leaf Springs, 78-96 Ford Bronco, 73-96 Ford F150

California residents: Proposition 65 Warning
Questions & Answers
PRODUCT REVIEWS
Ryan kennelly
Reviewed 04/28/2025
They team at WH4X4 did their homework on leaf springs. you could design your own leaf springs for a perfect fit, but it would cost you 4 times what this spring costs. I first lifted my 1975 F100 with an off the shelf kit from a well known brand. The truck was stiff. Really stiff. The root cause was the one size fits all spring that fit 1973-1996 100-350 trucks. rated at 350lb per inch. When I got the 791140, I quickly realized these guys built a spring targeting a vehicle under 5000lbs. Rating the spring it appeared to keep a smooth 205lb per inch through 10'' of travel. once installed on the vehicle, my 4680lb truck raised a bit more than before. (closer to 5'' lift). My favorite feature is the spring had a custom shape to it. this allowed the install without a spring wedge. Wedges often break and spit out during hard off roading. My pinion remained aimed at the transmission, so no vibrations came with the change. Once installed, the new spring also allowed for more droop. allowing me to run a longer shock. Cool additional features like shims between the leafs, plastic sliders, and diamond cut corners are all the stuff high end performance springs charge extra for are included. The ride quality definitely improved. only negative thing I can say, is the Military wrap makes noise. (they all do) when the loose part of the spring touches the spring mount or the main leaf. Final thoughts? Pair this spring with nice shocks and I think you could compete in your local off road event.

Rick
Reviewed 03/28/2014
As good as Deavers at a better price. I'm enjoying the soft ride!

Shop popular categories
5 stars