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Old 03-22-2011, 10:03 PM
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700r4 to th350c conversion

I have a 87 c10 that has a 700r4 but the trans burnt up. I bought a th350c and it has a green and a brown wire coming off the drivers side of it that I don't know where to hook them up and on the passenger side there is 2 prongs up by the dipstick that I don't know what hooks to them. All the factory wiring is not hooked up to the motor because I converted it from fuel injection to a carb the wiring is still hooked up to the 700r4. So can I use the wiring off the 700r4 some how or can someone tell me where to hook all theese wires up.

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Old 03-23-2011, 11:00 AM
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I am sure that Someone here knows the answer please post
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Old 03-23-2011, 05:16 PM
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The switch on the passenger side is a Spark Control Switch, it can be ignored.
I'm not sure about the Green & Brown wire colors but, Pin-A goes to 12V+ from the Brake Light Switch and Pin-D goes to -Ground on the TH350C. Should be able to see the ABCD terminals marked on the Plug.

On the 87 the ECM controls Lockup so you may want to just install a Toggle switch on the wire from the Brake Switch to activate TCC Lockup for Freeway use.

This is for swapping in a 700R4 but, will give you some pointers>> http://www.73-87.com/7387garage/drivetrain/lockup.htm
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Old 03-24-2011, 12:25 AM
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Quote:
Originally Posted by SSedan64
The switch on the passenger side is a Spark Control Switch, it can be ignored.
I'm not sure about the Green & Brown wire colors but, Pin-A goes to 12V+ from the Brake Light Switch and Pin-D goes to -Ground on the TH350C. Should be able to see the ABCD terminals marked on the Plug.

On the 87 the ECM controls Lockup so you may want to just install a Toggle switch on the wire from the Brake Switch to activate TCC Lockup for Freeway use.

This is for swapping in a 700R4 but, will give you some pointers>> http://www.73-87.com/7387garage/drivetrain/lockup.htm
Can I run the trans without the lockup hooked up? I have heard some say it won't hurt anything but others say it will heat the trans up and mess it up. If I do hook a toggle switch up when should I turn the lockup on? If I turn it on when I get to 3rd gear or once I get to 40 mph or so will it work fine?
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Old 03-24-2011, 05:12 AM
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Quote:
Originally Posted by rlb3
Can I run the trans without the lockup hooked up? I have heard some say it won't hurt anything but others say it will heat the trans up and mess it up. If I do hook a toggle switch up when should I turn the lockup on? If I turn it on when I get to 3rd gear or once I get to 40 mph or so will it work fine?
Yes, the TH350C can be run with the TCC unlocked and not cause damage.
You can switch the Lockup on anytime the Engine is turning enough rpm to prevent lugging. Around town at slow speeds it's not really needed.
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Old 03-24-2011, 06:02 AM
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Leads one to believe that the 700 burned up due to no signal from (disconnected?) ecm or the TV had the wrong geometry on the new carb. A toggle switch would do the trick on the 350C but inevitably you will forget to turn it off while slowing to a stop or turning causing lugging and that makes that solution a pita. I think there is a way to attach hot to brake switch so when activating the brakes; it will disengaged Lockup. Driveshaft length the same? Crossmember the same?
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Old 03-24-2011, 06:07 AM
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Quote:
Originally Posted by Fergusonic
Leads one to believe that the 700 burned up due to no signal from (disconnected?) ecm or the TV had the wrong geometry on the new carb. A toggle switch would do the trick on the 350C but inevitably you will forget to turn it off while slowing to a stop or turning causing lugging and that makes that solution a pita. I think there is a way to attach hot to brake switch so when activating the brakes; it will disengaged Lockup. Driveshaft length the same? Crossmember the same?
The 700 was on its last leg when I bought the truck. The ecm is still in the truck but it is not hooked up to anything since I did the carb conversion.
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Old 03-25-2011, 02:31 AM
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The original wires to the Trans Solenoid are already routed through the Brake switch so when the Brake pedal is depressed it will disengage the TCC. It wont chug with the Toggle switched on. The ECM supplys the -Ground on Pin-D for Lockup.
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Old 03-27-2011, 07:46 PM
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Quote:
Originally Posted by SSedan64
The original wires to the Trans Solenoid are already routed through the Brake switch so when the Brake pedal is depressed it will disengage the TCC. It wont chug with the Toggle switched on. The ECM supplys the -Ground on Pin-D for Lockup.
Is there already a constant +12v going to pin a that only looses power when hiting the brakes?
If So can I just cut the wire goin to pin d and hook it up to a toggle switch wich is just grounded. That way when I. Flip the switch it will ground pin d which would complete the curcuit?
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Old 03-29-2011, 03:22 AM
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It should work. Check it out with a Volt/Ohm meter.
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Old 03-29-2011, 04:23 AM
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Below are some diagrams that may be useful to anyone wanting to use the TCC as it was intended.

I have a TH350C in my '80 Malibu wagon. Being an '80 it has no ECM- just a fenderwell-mounted TCC vacuum switch (closes at 7 in/Hg, opens at 2.5 in/Hg) and the interrupter at the brake switch. It's a fairly straightforward set up and could be easily duplicated if "seamless" TCC operation was desired.

While no harm may come from running w/o lock up, I would recommend a tranny cooler be added if the TH350C was going to be used w/o lock up. There's a pretty hefty drop in RPM when it engages, so there IS a good amount of 'slippage' going on when the TC isn't locked. The more torque that's applied, the more slippage occurs.

More info by searching this board, and:

Manual wiring toggle swith for TH350C
replacing a th350 with a th350c?
Building a TH350C from scratch
th 250 case, same as 350
http://www.turbobuick.com/forums/tra...vs-200-r4.html
Attached Images
File Type: bmp TCC WIRING DIAGRAM.bmp (525.0 KB, 85 views)
Attached Files
File Type: pdf TCC 80 vette.pdf (45.9 KB, 57 views)
File Type: pdf TCC LOCK UP B&M GOOD.pdf (135.1 KB, 104 views)
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