The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Need help diagnosing 700R4 lockup issues..

fanmanj · 01-02-2012, 02:41 PM

I'm having some trouble... My '86 has a 700r4 that when I bought it, someone had cut the vacuum switch off. I have since found a switch in the junkyard, hooked it up, still no lockup... Should the wiring going through the brake switch and vacuum switch have 12v whenever the key is on? Can I apply 12v directly to the TCC solenoid wire and lockup the tranny just to make sure the solenoid is good? HELP!!!
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01-02-2012, 02:41 PM	#1
fanmanj Registered User Join Date: May 2011 Location: Thibodaux, LA Posts: 114	Need help diagnosing 700R4 lockup issues.. I'm having some trouble... My '86 has a 700r4 that when I bought it, someone had cut the vacuum switch off. I have since found a switch in the junkyard, hooked it up, still no lockup... Should the wiring going through the brake switch and vacuum switch have 12v whenever the key is on? Can I apply 12v directly to the TCC solenoid wire and lockup the tranny just to make sure the solenoid is good? HELP!!! Posted via Mobile Device Posted via Mobile Device __________________ Jay Bernard, Thibodaux, LA 1986 SWB Sierra Classic Stock roller 350/700R4 2008 Buick Enclave CXL 3.6 VVT, 6spd auto. PAINFULLY stock... (wife's ride)