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12-29-2018, 12:50 PM
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#1 |
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Registered User
 
Join Date: Jul 2010
Location: mogadore ohio
Posts: 867
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Weird switch on trans
My 71 C10 has a weird-looking switch on the transmission by the 2-3 lever? Is this one of those switches that changes the spark advance in 3rd gear?
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1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
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12-29-2018, 12:53 PM
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#2 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,492
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Re: Weird switch on trans
More than likely being a single wire
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12-29-2018, 01:30 PM
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#3 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,546
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Re: Weird switch on trans
Yup!
It’s actually the ground for the switch. |
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12-29-2018, 01:45 PM
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#4 | |
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Registered User
Join Date: Jul 2010
Location: mogadore ohio
Posts: 867
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Re: Weird switch on trans
Quote:
__________________
1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
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12-29-2018, 02:06 PM
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#5 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,546
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Re: Weird switch on trans
Advances it.
Do you have the switch up on the intake? |
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12-29-2018, 02:15 PM
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#6 | |
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Registered User
Join Date: Jul 2010
Location: mogadore ohio
Posts: 867
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Re: Weird switch on trans
Quote:
__________________
1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
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12-29-2018, 04:22 PM
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#7 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,546
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Re: Weird switch on trans
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12-29-2018, 05:33 PM
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#8 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,492
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Re: Weird switch on trans
If the state of Ohio does not have any smog inspections just remove the wire. It was GMs attempt in the early days to help with the NOx emissions by not allowing any timing advance until you were in high gear. The automatics has a pressure switch on the pass side that did the same thing
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