[Gmecm] Geting rid of electronic transmission.

[Chris Reynolds]

How about the TCC vacuum switch from an early 80s GM Van or Truck?   They close at around 6-8 in/hg and release between 2-4.   GM made them in several different part numbers, based on engine size, vehicle, transmission, and gear ratio.  The numbers quoted are from the originol switch on a 1983 G20, 305 4-bbl, 700r4, and 3.08 gears.

bcroe at juno.com wrote:  Dustin Lof, 

I don't know if you found it, but I am looking for an 
economical vacuum switch. Close circuit at about 
6-7 inches abd open circuit about 4" would be good, 
adjustable better. 

thanks, 
Bruce Roe


1 Mar 2006 Dustin Lof writes:
> I can look through my stuff and find you a part number
> for an adjustable vacuum operated switch, lock-up when
> vacuum is high, unlock when vacuum is low. I also use
> a vacuum delay valve, it smooths out vacuum
> transitions so when you stab and release the throttle
> quick it wont unlock and lock back up, it has a second
> or two of delay, those two parts with a little fine
> tuning make lockup seem "natural", one other thing I
> do is use a thermal swith inside the trans so it wont
> lock-up when the fluid is cold, you could use a
> thermal vacuum switch but the electric version looks
> better. I will post the part numbers when I get a
> chance to look for them. Dustin Lof
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