Quote:
Originally Posted by oldblue1968chevy
Hm not to self, PM spike for possible future auto trans rebuild
Whats the diff. between TH350 and TH350C?
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The TH350was the standard mid 70's automatic.
The TH350c was the upgraded version with a locking torque converter.
And used in heavier applications. But people don't like change,
Even through this newer tranny could give them
up to 20% better fuel efficiency. The other thing
they didn't like was that you had to wire up the locking
torque converter for it to work right. Companies like B&M
make control boxes for this purpose, With adjustable lockup mph control.
But this will cost you a few hundred dollars.
I won't be using a control box. I'll simply make my own.
The following are the AC Delco part numbers for the original components used for this transmission type.
Vacuum Switch - AC Delco # 212-331, GM # 14032087 (Quoted price was $35.31)
Brake Pedal Switch - AC Delco # D850A, GM # 25524845 (Quoted price was $11.32)
Vacuum Check Valve - AC Delco # 214-479, GM # 14020691 (Quoted price was $19.91)
Total cost = $66.54
The plug for wiring to the vacuum switch is not available new to
my knowledge and I could not find one at the local salvage yard.
Seeing that I forgot to cut the one out of the van it came out of.
To make the connection I will solder the wires directly to the connector
lands on the switch using shrink tubing to provide some strain relief protection.
One of the wires from the vacumm switch goes to a keyed 12V source
while the other wire goes to the brake switch.
The brake switch has four poles on it. Two are for the lockup function
and the other two are for the tail light circuit. I will have to figure out which
was which by trial and error. Once I get that figured out and connect
the switched 12v from the vacuum switch, I will need to run another
wire from the other pole down to the solenoid switch on my transmission.
The other side of the vacuum switch consists of a male vacuum
connection which I tubed to the intake manifold vacuum tree.
The small check valve was inserted between the switch and
the manifold.
That is it.
(Thanks houston54 for the info)
Spike
