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Getting More Aggressive - K5 Blazer Rear Suspension & Tires

Chevy K5 Blazer Suspension
Jerrod Jones | Writer
Posted March 1, 2012
Photographers: Jon Acuff

Starting to Finish My Six-Year K5 Build

I have no doubt that many of you can understand how off-road projects can take longer than you’d ever think possible. We all start out with an idea of what we want and good intentions of a timely build, with a reasonable dollar amount attached to the project.

If it were only that easy.

Good intentions pay for squat. The reality of most truck builds are that they take twice as long (if not five times as long) as you think they will, and cost at least twice what you thought you’d spend. And I think there might be some direct correlation between the amount of time a build takes and how much money you spend as well.

And such is the story of my K5 Blazer. While it was initially completed enough to run 4 Wheel Off-Road’s Ultimate Adventure in just two short months, there have been long downtimes in between trips, as parts broke and things were never really finished on the truck. Around 2008, the TH400 tranny started to have issues and shortly after the aftermarket fuel-injection system started acting up—and it’s been getting progressively worse ever since.

Last year, I finally got my K5 back out of the garage (“Get That Truck Out of Mothballs,” August 2010 issue) and started working on it again. Since then, it’s gotten a new Gearstar TH400 transmission, had the drivetrain improved and serviced, and SMP-Fabworks in Sun Valley, California, has been helping me finally finish the suspension and rollcage that was never quite completed. I’ve definitely still got some fuel-injection homework to do, and progress is going slower than originally suspected (surprise, surprise). But the plan is to have this totally ready to go (with shakedown runs already accomplished) in time for our Fullsize Invasion in Moab, Utah, in the beginning of April 2012. It’s time to get a little more aggressive with this build, first finishing the rear suspension and adding a set of Toyo Open County M/Ts on some new TrailReady 20-inch beadlocks.


01. The rear suspension on this Blazer was four-linked with Radflo 18-inch-stroke coilover shocks years ago, but that was the only thing done. There were no bumpstops, no sway bar, no limiting strap, and only two tabs holding the upper coilover bolt. Steven Parks started by boxing in our upper coilover mount so it would stop bending.

02. With the coilovers now properly mounted and the four-link working perfectly, we had to lessen the sway of the rear end. With no sway bar, the double-triangulated four-link and coilovers would practically allow this Blazer to flip on its side while still keeping the rear tires on the ground.

I had a 35-inch-long, solid 1-inch-diameter Speedway Engineering sway bar from an old project sitting at my house, and it just happened to be the perfect one (seriously, perfect length and sway bar rate) to deal with the 2,500-pound rear end while fitting directly under the stock fuel tank (still the stock tank, just with dimple-died holes in the tank skid).

03. The 14.25-inch-long (effective length) Speedway sway bar arms were connected with 6.75-inch links to the axle. When originally building the rear four-link, 1/4-inch plate had already been added for a sway bar link.

04. With the sway bar controlling the rear’s movement, it was time to keep the rear end from bottoming out. This Blazer has so much travel that bottoming out hasn’t really been an issue, but I didn’t want to find out what would happen if I ever did whack everything too hard. Parks welded in some bumpstop cans and added a crossmember to keep these bumpstops from twisted the channels of the frame when they’re bottomed out.

Sources

Bilstein
Poway, CA 92064
858-386-5900
http://www.bilsteinus.com
Crow Enterprizes
Anaheim, CA
888-869-2769
Toyo Tires
800-442-8696
www.toyotires.com
Speedway Engineering
Springfield, OH 45501
800-993-8880
TrailReady
Lynnwood, WA 98087
888-910-2999
www.trailready.com
SMP-Fabworks
Sylmar, CA 91342
(818) 890-3931
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