Rock Jock Leaf Spring Plate

Rock Jock Leaf Spring Plates: Off-Road Engineering Where It Counts

Rock Jock 4x4, founded by John Currie and backed by decades of Currie family off-road expertise, has been producing proven suspension components since the mid-1980s. Leaf spring plates are among the brand's most storied products — and for good reason. They were engineered from the ground up with the demands of serious rock crawling and trail abuse in mind, and they show it in every design detail.

What Sets Rock Jock's HD Spring Plates Apart

Rock Jock's spring plate lineup centers on their CE-9031 series of heavy-duty units, offered in configurations to suit a range of leaf spring widths and axle tube diameters. These are not simple flat stamped plates — they are fully enclosed, box-style units purpose-built for spring-under axle applications. The box construction serves a dual purpose: the raised ends form a ramp profile that helps the plates glide over rocks and obstacles on the trail, while simultaneously shielding the u-bolt nuts inside from direct impact and debris.

The material spec reflects Rock Jock's no-compromise approach. The CE-9031D and CE-9031E models feature a 1/4 in. thick laser-cut steel top plate with 3/16 in. steel sides and bottom skid plates, while the CE-9031C variant steps up to a 5/16 in. thick steel top plate paired with a built-on 1/4 in. skid plate to protect the u-bolts. Slotted mounting holes allow fitment across a range of axle housing tube diameters — from 2 1/2 in. up to 3 1/4 in. OD — making them adaptable to a variety of solid axle platforms.

Integrated and Replaceable Mounting Hardware

One of the most practical features of Rock Jock's spring plates is the inclusion of bolt-on, replaceable shock mounts — and depending on the variant, sway bar mounts as well. Rather than welding these studs permanently in place, Rock Jock uses a replaceable stud design so that a bent or damaged mount from trail contact can be swapped out without replacing the entire plate assembly. This design philosophy — building serviceability into heavy-use components — is a hallmark of the Rock Jock brand.

Fitment spans a wide range of popular platforms. The CE-9031C, for instance, is compatible with 76–86 Jeep CJ and 87–95 Wrangler YJ applications in both front and rear configurations, while the CE-9031D and CE-9031E cover universal spring-under applications for 2 in. wide springs as well as specific Jeep CJ front axle setups. All plates ship in a durable semi-gloss black powder coat finish for corrosion resistance in demanding conditions.

A Legacy Proven in Competition

Rock Jock's spring plates are described as among their original, oldest products — a lineage that speaks to their relevance in the real-world off-road community. The brand's competition pedigree, including a first-place finish in the Extreme Rock Crawling Championship Series in 2001, ensures that even their foundational components like spring plates have been developed and refined under the most demanding conditions imaginable. When you're choosing a leaf spring plate for a capable off-road build, Rock Jock's HD series represents the kind of proven, over-engineered hardware that keeps your suspension intact when the trail gets serious.