Building a Custom CJ Front Suspension - - Jeep at Off-Road.com
Jeep »

Price and Compare Vehicles:
New, Used, and Powersports    Go button

Building a Custom CJ Front Suspension

John Nutter
After running the same spring under axle (SUA) setup with a shackle reversal for years, Mike Knorr was ready for a change. His set up performed well, but the springs were getting tired and Mike wanted something that took performance to the extremes. A spring over axle (SOA) conversion was the obvious solution, but Mike didn't want to give up his shackle reversal. This article is the first in a two part series on extreme suspension modifications. It covers what went into his new front suspension including reworking spring mounts, a long travel driveshaft, military wrapped spring packs, custom shock towers for the longest RS9000 shocks available, and high clearance steering with heim joints.

Spring Mounts

fixed front spring hanger Mike wanted to keep his shackle reversal while doing the SOA. His original shackle reversal system was relocated and raised to give a better approach angle. Almost two inches were taken off between the spring eyes and the frame. The bracketry was moved forwards until the main spring eye was directly below the leading edge of the frame. front shackle hanger Mike fabricated new shack hangers out of heavy gauge tubing and 1/4" x 2 1/2" mild steel. First the edge of the flat stock was welded to the tubing, then it was bent all the way around and welded to itself. After that the gap on each side was welded shut and ground smooth. It looks similar to a standard rear shackle hanger, but it is heavier duty. The shackle hangers were welded to the frame after the shackle position was verified.

Springs:

Spring packs Mike originally tried using some stock CJ rear springs, but they didn't have enough arch for his needs. Next Mike ordered from JC Whitney some heavy duty CJ rear spring packs with military wrap. These springs are real nice springs for the cost. Spring clamp The only down side to these springs is they came with cheesy clamps that would get torn off quickly on rocks. To prevent his packs from fanning out Mike had some riveted on spring clamps added that are similar to what Jeep uses from the factory. While the packs were apart Mike painted them again.

Steering:

Tie rod and drag link bracket Mike designed a custom high clearance steering setup and had a friend who is a machinist fabricate it. It uses mid '70s Wagoneer knuckles and flame cut arms for the drag link and tie rod. Mike used the same setup that I used in my High Clearance Steering, except he used 3/4" heim joints with a 40,000 lb tensile strength rating instead of tie rod ends. Mike also used some thick walled DOM tubing for the tie rod and drag link. One end was tapped for right hand threads and one for left to make adjustments easier. The custom steering arms were designed with heim joints in mind, but the pitman arm had to be drilled to fit the bolt.

Shock towers and shocks:

Mike had Pat Hegleson at Custom Welding in Williston, ND build these shock towers and cross brace. The original front shock towers were cut off and the new setup was mocked up. With the new shock towers clamped in place jack stands and a floor jack were used to contort the Jeep and test the suspension flex. Opposite corners were raised until a tire came off the ground. Clearances were noted and the position of the shock towers were adjusted. When Mike was happy with the shock tower placement, the shock towers were welded in place. The cross brace uses polyurethane bushings to allow for flex and disassembly in case the motor needs to be removed.
Shock towerShock tower

Acknowledgments

I'd like to thank Mike Knorr for letting me shoot pictures while I was supposed to be turning a wrench. I'd also like to thank Myron Hanson for the use of his well equipped shop and expert black smithing and metal working. Pat Hegleson deserves a big thanks for selling Mike the shock towers and Dave Kesky deserves a thank you for doing most of the fabrication on Mike's steering arms.

Important Disclaimer:
This information is a personal account of modifications done to one particular Jeep and is not necessarily endorsed or encouraged for any other application. As with any suspension or steering modification the handling and safety of the Jeep is affected. In some circumstances this may be dangerous. We are only providing commentary and opinion based on our experience, your experiences could be significantly different. Off-Road.Com cannot predict how any given modification will be used or what it will be subjected to. We do not recommend or endorse this or any product for any specific or general application. Anybody attempting this or any other modification does so at their own risk, we do not assume any liability.

Accept no compromises in any part of a custom suspension setup. It must be perfect, your life and the lives of those around you depend on it.

Last modified Monday, 08-Nov-1999 19:06:50 PST

POST A COMMENT
Your email address will NOT be published.
appears with your comment
read our privacy policy
Note: does not support HTML
All comments submitted are subject to review, and may be delayed before posting. We reserve the right not to post comments.
Untitled Document
Sponsored Links
Need Gas Mileage & Power?-
Free flowing performance exhaust can increase gas mileage and increase power. We can all benefit from increased mileage and increased horsepower & torque improves towing, mud-slinging and the ability to turn those larger tires you put on your truck. See what Flowtech Exhaust has for your gas or diesel truck.
Off-Road Videos -
Check out over ten years of extreme 4x4 action, product testing and the Off Road Nation at play. Baja racing to rock crawling, ATVs in the sand to motorcycles in the dirt, it?s all here. Rate them, share them and upload your own.
ATV Reviews -
Honda, Suzuki, Yamaha, Polaris, Kawasaki, Can-Am. First rides to long-term tests, check out the latest in ATVs, UTVs and Side-by-Side vehicles of every make and model. Read expert opinions and follow custom project vehicles.
In the Business of Off-Road?-
If you work in the off-road industry, you need Off-Road Business! Our magazine, eNewsletter, and website give you the latest industry news, new product reviews, and business tools and services you need to succeed! Check out OffRoadBusinessMag.com!

Enewsletters

Stay on Top of All the Action:
Sign up for Off-Road.com's Enewsletters

Source: Jeep at Off-Road.com,
Click here