Vacuum switch for 200 4R lockup - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 19 (permalink) Old Mar 8th, 04, 8:16 PM Thread Starter
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I'm thinking of add a vacuum switch. Are they all the same or are there differences. Are any adjustable. What year and model car is a good source. Thanks,

Pat Kelley
66 El Camino, daily driver
Sold 67 El Camino, Bracket car (7.33, 93.60, 1.61 60', 1/8) (1.53 60', 7.26 660', 11.50, 115.08, 1/4 mile) 355 powered
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post #2 of 19 (permalink) Old Mar 8th, 04, 10:49 PM
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I found mine on a mid 80's GM truck with a 350c trans.

Jim
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post #3 of 19 (permalink) Old Mar 8th, 04, 11:16 PM
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My switch from TCI (www.tciauto.com) is adjustable. It seems to work.

Theo.

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post #4 of 19 (permalink) Old Mar 8th, 04, 11:46 PM Thread Starter
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Theo, do you have the part number. I couldn't find it at TCI' site. Thanks.

Jim, thanks, I'll check the bone yards.

Pat Kelley
66 El Camino, daily driver
Sold 67 El Camino, Bracket car (7.33, 93.60, 1.61 60', 1/8) (1.53 60', 7.26 660', 11.50, 115.08, 1/4 mile) 355 powered
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post #5 of 19 (permalink) Old Mar 9th, 04, 7:26 AM
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I would have to call them and find out, but I think it is part of their lockup kit. If so, I am sure I can get it for you too.
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post #6 of 19 (permalink) Old Mar 9th, 04, 10:38 AM
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Pat,

Here is the 200-4r page. It is part number 376600.

200-4R

Also, here is the manual for the kit. At the end, it describes how to change the vacuum switch setting.

Lock-up Kit Instructions

I have it installed in my tranny and it works.

My tranny shifts to fourth and locks up almost at the same time. The same when it down shifts. Does anyone know if I need to change the lock-up pressure?

Theo.

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post #7 of 19 (permalink) Old Mar 9th, 04, 11:16 AM Thread Starter
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The TCC is already wired with the BTO wiring setup. I have a manual switch for 4th gear only, off completely, and 2nd - 3rd - 4th lockup. The problem arises when the car slows down, like with slow traffic on the freeway, and then I need to accelerate. The convertor stay locked and the engine lugs until I force a downshift or manually turn off the TCC.

Looks like the TCI switch is in their kit, which I don't need. Steve, could you find out if the vac switch is available separately? I wonder if they are re-packaging a GM unit.

Pat Kelley
66 El Camino, daily driver
Sold 67 El Camino, Bracket car (7.33, 93.60, 1.61 60', 1/8) (1.53 60', 7.26 660', 11.50, 115.08, 1/4 mile) 355 powered
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post #8 of 19 (permalink) Old Mar 9th, 04, 12:14 PM
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I have GM part # 14007803 as a vaccuum thermal switch. I don't know if its adjustable or not. The thermal switch part was used to ensure the TC didn't lockup till operating temp was reached.

This switch is under $10 at GMparts direct.
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post #9 of 19 (permalink) Old Mar 9th, 04, 1:10 PM Thread Starter
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Thanks, Wayner. That looks like what I need.

Pat Kelley
66 El Camino, daily driver
Sold 67 El Camino, Bracket car (7.33, 93.60, 1.61 60', 1/8) (1.53 60', 7.26 660', 11.50, 115.08, 1/4 mile) 355 powered
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post #10 of 19 (permalink) Old Mar 9th, 04, 1:12 PM
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Waiting for info on just the switch, but the whole lockup kit I get for $70 from TCI...
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post #11 of 19 (permalink) Old Mar 9th, 04, 3:50 PM
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Wonder how much it would be for a vac. switch at your friendly GM dealer?


http://www.presair.com/


http://content.honeywell.com/sensing.../catswitch.asp

A couple of searches this is what I found, so there are more options.

Jim

Jim

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post #12 of 19 (permalink) Old Mar 10th, 04, 4:57 PM Thread Starter
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I did some checking at Chevy dealer and the number Wayner gave doesn't look like it will work. It is a thermally controlled vacuum switch with no electrical connections. The picture at tci looks like what I need. One vacuum port and two electrical connections. Now to find out if it is available separately.

77 Cruiser, it looks like GM controls the TCC on the ground side so all their controls are designed for this (i.e. internal grounding). My setup is grounded in the trans and the positive leg controls the TCC.

Pat Kelley
66 El Camino, daily driver
Sold 67 El Camino, Bracket car (7.33, 93.60, 1.61 60', 1/8) (1.53 60', 7.26 660', 11.50, 115.08, 1/4 mile) 355 powered
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post #13 of 19 (permalink) Old Mar 10th, 04, 9:37 PM
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The GM vac. switch is a 2 wire so you could just put it inline on the positive wire.

Jim

Jim

77 Monte
385- AFR 190's Clay Smith solid--200-4r w/ 3.73's
67 Imp.SS for the wife 275 hp 327-TH350

http://myweb.midco.net/77cruiser/
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post #14 of 19 (permalink) Old Mar 10th, 04, 11:20 PM Thread Starter
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Thanks, Jim, for the picture. That is a different part than the Chevy dealer had for the PN you posted. What he had screwed into the water jacket and had two vacuum ports with no wiring terminals. He suggested, but didn't have (special order), PN 14014519. Would this be what you have?

Pat Kelley
66 El Camino, daily driver
Sold 67 El Camino, Bracket car (7.33, 93.60, 1.61 60', 1/8) (1.53 60', 7.26 660', 11.50, 115.08, 1/4 mile) 355 powered
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post #15 of 19 (permalink) Old Mar 11th, 04, 12:12 AM
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I don't know what the part no. is but it looks like the one in the pic. I'll look tomorrow & see if there is a no. on it.

Jim

Jim

77 Monte
385- AFR 190's Clay Smith solid--200-4r w/ 3.73's
67 Imp.SS for the wife 275 hp 327-TH350

http://myweb.midco.net/77cruiser/
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