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I just bought a 91 blazer 5spd manual and it has the cruise control stock but cruise control doesnt work. I search and it seems the rpo for the automatic is K34. Did the manuals come with cruise? If so whats the rpo?
91 blazer 5spd 4x4
 

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Check the vacuum hose to the pedal release for a leak.
It's fairly easy to swap in the newer style all electric cruise unit into one of the late 1st gens.
I did it years ago using a Caprice unit. The 90's electric modules are all the same.
Here's a post on how to, the guy was figuring it out as he went so it's a long thread. There is a link to an earlier how to in the 2nd reply.
 
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