****... I think that might have been an important piece....

[Loco_hosa]

I went to pull all the "Un-needed" vacuum lines off my 1984 K5, and I lost torque converter lockup. Oops! I know nothing about automatics and didnt know there were any vacuum lines that had **** to do with the trans.

Now, I have done research, and I believe that I narrowed it down to one of two options as to what controls the magic over the torque converter, being a small box with two wires and two vacuum lines, or a cylinder with only one vacuum line. Which one is important, and does it require the ported vacuum or the manifold vacuum?

While on the subject... Does the vacuum advance on this truck like ported or manifold?

Note to self: Dont get delete happy....

EDIT: I love all I am learning in doing this though. I didnt know torque converters could cause a car to die at a traffic light till I did the research. Now I know!

 

[Loco_hosa]

I tried to post some pictures, but it doesnt like me because I am a noob. follow the links, just take the space out before the .com

steelsoldiers .com/attachments/cucv/124387d1242797021-84-k5-700r4-torque-converter-lockup-question-img00143.jpg
steelsoldiers .com/attachments/cucv/124385d1242797021-84-k5-700r4-torque-converter-lockup-question-img00141.jpg

 

[scooter122983]

Vac advance needs ported vacume. Your tranny needs manifold vacume.

 

[dyeager535]

IIRC, the TCC vacuum switch is the one on the drivers side of the firewall.

Can't get to those photos without being a member apparently.

 

[gmcman355]

hook the trans to ported vacuum so that tcc disengages on coast down. saves some wear and tear on the tcc.
also just as an fyi as far as I know the 125 trans is the only one in the gm lineup that has the ability to keep tcc applied in first gear causing the stall condition you mentioned. all others are hydraulically unable to apply tcc in first gear regardless of what vacuum or electronic controls you are using

 

[Loco_hosa]

Got it handled! Thanks yall.

hook the trans to ported vacuum so that tcc disengages on coast down. saves some wear and tear on the tcc.
also just as an fyi as far as I know the 125 trans is the only one in the gm lineup that has the ability to keep tcc applied in first gear causing the stall condition you mentioned. all others are hydraulically unable to apply tcc in first gear regardless of what vacuum or electronic controls you are using

While doing my research I came across a site that said that faulty and malfunctioning torque converters can stay engaged when not supposed to, causing a car to stall at traffic lights. This wasnt happening on my truck, I just found the information interesting. Maybe I misunderstood?

 

[pauly383]

To the left of the brake booster ( as you look in , your left ) is the TCC switch . Run a hose from it to full time vacuum . The TCC needs to know if your cruising or getting on it

The one that looks like it to the right of the a/c evaporator is the tip in switch for the ESC spark computer .