Small 700r4 wiring question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NorwayC-10 · 03-10-2008, 02:23 AM

I'm about to finish installing my 700r4 transmission and I'v run into a small problem. I used the Bowtie Overdrives lock-up kit, and this kit comes with a new 4th gear pressure switch. The instructions tells me to replace my old one with the new. The problem is, that I can't seem to find the old pressure switch. I'm including a picture of my old wiring, a picture from the manual and also a few pictures of my attempt to solve the new wiring. Is this correct? Or maybe anyone knows if the pressure switch is located somewhere else? Thank you!!

70GMCer · 03-10-2008, 04:35 AM

You have it in the right position. That is the 4th gear clutch switch. The plug just to the left in the 3rd picture is for 4-3 downshift.

70GMCer · 03-10-2008, 04:36 PM

Is that tranny rebuilt? While you have that cover off, did you look into the 1-2 accumulator housing to make sure that spring inside is not broke? That's the housing in the lower right corner of picture 3. That spring inside has a bad habit of breaking. Have you did any other mods to it?

NorwayC-10 · 03-10-2008, 07:13 PM

Thanks for the respons. No, I'v done no modifications to the transmission. It comes from a -86 Camaro, and I took the car for a ride before the seller removed it from his car. Everything seemed fine and it shifted smoothly. Could be that the previous owner of the Camaro may have rebuilt it, but I don't know. What puzzels me is that I can't find the pressure switch described, but as I understand there were several options on wiring in these cases.

**passthebuck** · 03-10-2008, 09:24 PM

Put in a high pressure boost valve in the pump as long as you at it. It's only a snapring to change & that is THE KEY to long 700r4 life. It's the best $33 you'll ever spend.

http://67-72chevytrucks.com/vboard/s...d.php?t=276045

http://www.hotrodders.com/articles/T...ification.html

http://purplesagetradingpost.com/sum...o/700R4p1.html

http://links.chevelles.net/links/Wor...l_Auto_Tranny/

http://www.geocities.com/crosley_az/4l80e.htm

http://www.geocities.com/crosley_az/700id.htm

http://www.hotrodders.com/forum/chev...R4+Information

NorwayC-10 · 03-12-2008, 10:55 AM

Thanks for the links.

03-10-2008, 02:23 AM	#1
NorwayC-10 Registered User Join Date: May 2007 Location: Norway Posts: 8	Small 700r4 wiring question I'm about to finish installing my 700r4 transmission and I'v run into a small problem. I used the Bowtie Overdrives lock-up kit, and this kit comes with a new 4th gear pressure switch. The instructions tells me to replace my old one with the new. The problem is, that I can't seem to find the old pressure switch. I'm including a picture of my old wiring, a picture from the manual and also a few pictures of my attempt to solve the new wiring. Is this correct? Or maybe anyone knows if the pressure switch is located somewhere else? Thank you!! Attached Images

03-10-2008, 04:35 AM	#2
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Small 700r4 wiring question You have it in the right position. That is the 4th gear clutch switch. The plug just to the left in the 3rd picture is for 4-3 downshift. __________________ 1997 GMC Sierra Ext 1965 Mustang Last edited by 70GMCer; 03-10-2008 at 04:36 AM.

03-10-2008, 04:36 PM	#3
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Small 700r4 wiring question Is that tranny rebuilt? While you have that cover off, did you look into the 1-2 accumulator housing to make sure that spring inside is not broke? That's the housing in the lower right corner of picture 3. That spring inside has a bad habit of breaking. Have you did any other mods to it? __________________ 1997 GMC Sierra Ext 1965 Mustang

03-10-2008, 07:13 PM	#4
NorwayC-10 Registered User Join Date: May 2007 Location: Norway Posts: 8	Re: Small 700r4 wiring question Thanks for the respons. No, I'v done no modifications to the transmission. It comes from a -86 Camaro, and I took the car for a ride before the seller removed it from his car. Everything seemed fine and it shifted smoothly. Could be that the previous owner of the Camaro may have rebuilt it, but I don't know. What puzzels me is that I can't find the pressure switch described, but as I understand there were several options on wiring in these cases.

03-10-2008, 09:24 PM	#5
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	Re: Small 700r4 wiring question Put in a high pressure boost valve in the pump as long as you at it. It's only a snapring to change & that is THE KEY to long 700r4 life. It's the best $33 you'll ever spend. http://67-72chevytrucks.com/vboard/s...d.php?t=276045 http://www.hotrodders.com/articles/T...ification.html http://purplesagetradingpost.com/sum...o/700R4p1.html http://links.chevelles.net/links/Wor...l_Auto_Tranny/ http://www.geocities.com/crosley_az/4l80e.htm http://www.geocities.com/crosley_az/700id.htm http://www.hotrodders.com/forum/chev...R4+Information __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car Last edited by passthebuck; 03-10-2008 at 09:25 PM.

03-12-2008, 10:55 AM	#6
NorwayC-10 Registered User Join Date: May 2007 Location: Norway Posts: 8	Re: Small 700r4 wiring question Thanks for the links.

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