The power-assisted steering was OEM for '67 and prior. The powered steering gearbox didn't come out til '68. [If I'm not wrong.] I tried using a '69 steering gear on my '67 K/10 Suburban and had a lot of problems. I guess on the C/10s it's not so critical, but my steering geometry was all screwed up -- it took 3 lanes to make a 180*. When 1/2" grade 8 bolts were shearing off, I got concerned.
I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.
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