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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,185 Posts1,057,203 Members48,465 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#86882 07/02/2005 4:22 AM | Joined: Nov 2004 Posts: 10 Junior Member | | Junior Member Joined: Nov 2004 Posts: 10 | When I had the same situation in my 66 GMC I replaced the entire conrol circuit with a Bosch unit out of a late 70s Volvo. A vast improvement over stock [even if working perfectly] The only thing that made the entire job take more than 10 minutes was figuring out a mount for the big resistor. Now has FOUR real speeds in addition to OFF.
IF YOU DIDN'T TEST IT, IT DOESN'T WORK
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