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Old 01-19-2016, 02:19 AM   #3
MaxPF
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Join Date: Jan 2016
Location: Mesa, AZ
Posts: 60
Re: A K5 Cummins Conversion: The saga continues...

Most guys increase tire size progressively: 33's to 35's to 37's and so on. I started with 32's when I bought the truck, and put 33's on it shortly thereafter. 33's are the biggest a Blazer will take without a lift. Like many others, I decided at some point I needed to go bigger. I ended up buying 37" Dick Cepek Radial FC-II's and mounting them on 15" Black Soft-8 steelies. Now, thesde tires wouldn't fit on my truck without a lift, but I already had a plan.

I scored a set of 2-1/2" lift Rancho prerunner springs from another wheeler.



2-1/2" wasn't quite tall enough, so I built a pair of 1 inch "zero-rates"



In order to avoid cutting the rear part of my fenders I moved the axle forward about 2 inches. Here's the result, with the then-new Cepeks mounted up:



To lift the rear I used a shackle flip. A popular easy flip was the "Echobit" flip, which was a bracket that converted the stock tension shackle setup to a compression shackle setup. It required no cutting or removal of stock brackets and gave about 6 inches of lift. Since old Blazers usually suffer from saggy butt syndrome the extra bit of rear lift is welcome. I built my own Echobit-type brackets:



And the final result:



With big tires and wheeling I eventually ended up with the dreaded frame cracks around the steering box bolt holes. I welded the cracks up and welded some thick washers around the holes to hopefully prevent a recurrence:

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1991 V1500 Blazer (Silverado), 5.9L 12V P-pumped Cummins (5x .012 sac injectors, #6 fuel plate, WH1C with external 38mm wastegate running 30psi), NV4500 with 1-⅜" input shaft, SBC Con-O clutch, NP205, HAD, 4.10 D61/14BFF spinning 37" Nitto Exo's

"I got a shotgun, a rifle, and a four wheel drive and a country boy can survive."
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