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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: y2k_harley on October 13, 2009, 09:13:32 pm

Title: What's this???
Post by: y2k_harley on October 13, 2009, 09:13:32 pm

http://img117.imageshack.us/img117/2520/10421150701481474504816.jpg (http://img117.imageshack.us/img117/2520/10421150701481474504816.jpg)

I am curious, what is the thing on the firewall above the right valvecover with the vaccum hose attached?  I have it on my truck, but it doesn't have a vaccum hose attached.  Where does the vaccum hose come from?

Title: Re: What's this???
Post by: choptop on October 13, 2009, 09:23:44 pm

I believe its the lockup switch for the torque convertor

Title: Re: What's this???
Post by: y2k_harley on October 16, 2009, 05:56:56 pm

Hmmm.  The tranny isn't a 350C, there isn't any wires attached.  There are a couple plugs tucked away behind the brake booster, but not sure if 1 is for the TC wires or something else.  I know the engine has been replaced, guess maybe the tranny was swapped too.

Will this Lockup setup work with a 700R4?