200R4 lockup wiring - Chevelle Tech
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post #1 of 10 (permalink) Old Sep 6th, 03, 8:35 PM Thread Starter
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Post 200R4 lockup wiring

I finally got a 200r4 installed today, not running yet but I want to verify the lockup wiring for it. It is a monte SS 200r4. I checked out the bowtie overdrive site and all it shows that is necessary is a 12v power source through the brake light switch and then to the solenoid connector on the side of the trans. Is that it? Does this mean that the trans will lockup automatically in 4th gear and unlock when I hit the brake switch? I was reading through the archives and was seeing guys here using a manual toggle to turn on the lock circuit and I was wondering why if it works automatically as is. Also all the links to peoples wiring diagrams seemed dead now since they are old, any suggestions? I cant wait to try one of these out in an older car.

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post #2 of 10 (permalink) Old Sep 6th, 03, 10:50 PM
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The answer is yes it is that simple if your tranny is set up for 4th gear lockup only. Your tranny will always lockup after it shifts into 4th and unlock if you hit the brakes.

When you wire in a switch for manual use it is to allow lock-up in 2nd 3rd and 4th. You still need to set up the brake switch cut off even if using a manual switch.

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post #3 of 10 (permalink) Old Sep 6th, 03, 11:36 PM Thread Starter
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Is there any way to tell if my trans is setup for the automatic lockup in 4th? It is out of an 85-87 monte SS, believe the code was CZ? From what I remember of driving the monte SS's I dont remember any lockup in 2nd or 3rd, just in 4th, or at least I remember the RPM drop in 4th when the converter locked but nothing like that in 2nd or 3rd.

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post #4 of 10 (permalink) Old Sep 7th, 03, 1:09 AM
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Trace the wires inside the pan. But I can't see one not being setup for auto 4th LU unless it had a non LU converter.
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post #5 of 10 (permalink) Old Sep 7th, 03, 10:43 AM
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On mine, full time power is sent to the positive wire on the TCC solenoid. A ground is sent via vacuum switch to the 4th gear clutch switch, engaging the TCC solenoid in 4th gear only. A manually operated switch completes the ground to the TCC clutch, locking the converter in 2nd, 3ed, and 4th. For this to work you must have a two wire solenoid, a one wire is grounded by contact, and will engage whenever power is applied.
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post #6 of 10 (permalink) Old Sep 7th, 03, 10:46 AM Thread Starter
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Is there any way to tell what I have now without dropping the pan, possibly by the number of pins on the trans connector? This trans is stock so should have whatever the factory had as far as setup. **edit** found some info that says that the CZ trans uses a 4th gear pressure switch to tell the ECM the trans is in 4th gear, and that the ECM then sends a ground to the solenoid to lock it. So that sounds like 4th gear lockup only..I have also seen posts that the 200r4 doesnt flow fluid to the cooler unless its locked up..very confusing. Should I just get the B/M speed control lockup setup or can I wire this up simply?

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post #7 of 10 (permalink) Old Sep 8th, 03, 11:55 AM Thread Starter
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wow where are all our 200r4 guys?

Dave
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post #8 of 10 (permalink) Old Sep 8th, 03, 12:00 PM
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Dave, the guys over at Turbobuick.com are really great for 2004R info. Check the transmission forum and good luck!

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post #9 of 10 (permalink) Old Sep 8th, 03, 3:59 PM Thread Starter
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thanks Tony I will check there..from reading the archives I thought we had a few guys here that had gone through this swap.

Dave
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post #10 of 10 (permalink) Old Sep 8th, 03, 8:43 PM
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at my shop we just finnished installing a 200r4 into a 78 corvette. the transmission we took out was a th350. what we did to insure lock up was to take the hot wire from the stop light switch. On this corvette it has a 4 prong stop lite switch. 2 of the connectors are for the stoplites, and 2 are for the cruise control. The cruise side of this switch is "normally closed" ans when the brakes are applied it "opens" the switch. this would unlock the converter when the brakes are applied. we also put a SPST toggle switch in line of this switch to keep the converetr from locking up in stop and go traffic.

IF your trans has a switch screwed into the valve body, you can have 4th gear lockup only, and If you put a toggle switch in the wire going to it you will be able to trun off the lock up feature when driving in traffic 35-50 mph stuff. I own a Grand national, and because of my 67 Chevelle, I have not done the toggle switch yet, and it is kind of annoying to drive in the 35-50 rush hour traffic.
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