Skyjacker J40RSB Black Softride Rear Leaf Spring 4in for 1976-1986 Jeep CJ5/CJ7

Vehicle Fitment

• 1976-1983 Jeep CJ5 (Base, Renegade, Golden Eagle, Laredo, Limited, 4WD)
• 1976-1986 Jeep CJ7 (Base, Renegade, Golden Eagle, Golden Hawk, Laredo, Limited, 4WD)
• 1981-1985 Jeep Scrambler / CJ8 (Base, SL, SR, Laredo, Renegade, 4WD)

Fitment Notes

• 4WD applications only - all confirmed fitments are 4WD configurations
• Jeep CJ5 production ended in 1983; fitment does not extend beyond 1983 for CJ5
• Scrambler (CJ8) models may require an additional rear Fitted Leaf (Skyjacker FLJ40R) to support extra weight from overland accessories, winches, or motor swaps
• Sold as a single spring; order 2x for a complete rear pair
• Spring Bushing Kit (Skyjacker SE45J) is required separately to complete installation of a pair for 1976-1986 CJ and Scrambler applications
• Optional U-Bolt Kit (Skyjacker UJ4R) available for installation with OEM axle on 1976-1986 CJ and Scrambler applications
• The "B" suffix designates the black corrosion-resistant coating finish, distinguishing it from the standard J40RS

Features

• Manufactured from American steel for consistent strength, durability, and long-term performance in demanding off-road conditions
• Each leaf is individually shot-peened with hardened steel pellets at high velocity, compressing the steel surface to significantly increase tensile strength and wheel travel
• Shot-peening process allows maximum suspension articulation and ride quality without shortening spring service life
• Uses bolt-on, floating bolt-style spring clips instead of cinch-style bend clips, fully eliminating inter-leaf friction and binding
• Full-length tapered leaf design promotes greater flex at the leaf ends, improving articulation over rough and uneven off-road terrain
• Full-length tapering distributes load stress more evenly across the spring pack, reducing leaf-to-leaf wear and digging
• Delivers 4 in. of rear lift height, providing increased ground clearance and compatibility with larger off-road tires - without the need for lift blocks or spacers
• Black, heavy-duty corrosion-resistant finish protects each leaf for extended durability in harsh operating environments
• GVW rating and load-carrying capacity equal to or greater than factory OEM rear spring specifications
• Compatible with Skyjacker's optional FLJ40R Fitted Leaf for builds carrying heavy overland accessories or requiring additional load support

Specifications

• Part Number: J40RSB
• Position: Rear
• Lift Height: 4 in.
• Spring Clip Style: Bolt-on floating style (non-friction)
• Finish: Black corrosion-resistant coating
• Material: American-made high-tensile steel
• Surface Treatment: Shot-peened for increased tensile strength
• Drivetrain Compatibility: 4WD
• Quantity: Single (1 spring per unit)

Included Components

• 1x Skyjacker Softride Rear Lift Leaf Spring, Black (J40RSB)

Product Description

The Skyjacker J40RSB Softride Rear Lift Leaf Spring delivers 4 inches of rear suspension lift on 1976-1983 Jeep CJ5, 1976-1986 Jeep CJ7, and 1981-1985 Jeep Scrambler (CJ8) platforms. The "B" designation identifies this spring as the black-coated variant, featuring a heavy-duty corrosion-resistant finish applied over each leaf for extended durability in the kind of harsh, wet, and abrasive conditions these classic Jeeps are regularly put through. Beyond its finish, the J40RSB is built on Skyjacker's proven Softride engineering - individual leaves manufactured from American steel and processed through a high-velocity shot-peening procedure that compresses the leaf surface and substantially increases tensile strength, enabling the spring to achieve greater wheel travel and improved ride quality without shortening its service life.

The Softride design differentiates itself from conventional leaf springs through two key construction choices. Rather than cinch-style bend clips - which clamp tightly over the leaf pack and generate friction that restricts suspension travel - the J40RSB uses bolt-on, floating spring clips that allow the pack to move freely across its full range of motion. Each leaf is also tapered along its full length, not just at the tips. This full-length taper distributes load stress across a broader contact area while directing maximum flex to the ends of the leaves, reducing wear between individual leaves and improving overall articulation during off-road use.

The J40RSB is sold as a single spring - two are required for a complete rear installation. The Skyjacker SE45J Spring Bushing Kit is required separately to complete the pair, and the optional UJ4R U-Bolt Kit is available for use with the OEM axle. For Scrambler models - which carry a longer wheelbase and are often built with heavier accessories - Skyjacker recommends evaluating the optional FLJ40R Fitted Leaf to increase load capacity without changing lift height. This spring is a rear-only component designed specifically for 4WD CJ and Scrambler platforms and should be installed with matching front springs for proper suspension geometry.