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gear vendors overdrive - someone with a little knwldge #1563859 01/16/14 04:56 AM 01/16/14 04:56 AM
Joined: Nov 2007 Posts: 33 Indianpolis ,IN - VIC, Austr... Tim L OP member
Tim L OP member Joined: Nov 2007 Posts: 33 Indianpolis ,IN - VIC, Austr...	Hey guys, installing a GV on the back of a 727 going into a 69 charger. I bought the unit second hand out of a cuda only problem being it didn't come with the electrical boxes - activation switch? Controller module? (I am assuming that's what these boxes are)******** What do I need to make it work? Can I install a switch that would activate it and forget about the controller module? Any help would be greatly appreciated. Thanks, Tim.

Re: gear vendors overdrive - someone with a little knwldge [Re: Tim L] #1563860 01/16/14 07:04 AM 01/16/14 07:04 AM
Joined: Jan 2003 Posts: 5,903 Athens, Greece Pyper70 master
Pyper70 master Joined: Jan 2003 Posts: 5,903 Athens, Greece	I think you can get away with the foot switch by putting in a switch at your discretion but the GVO works with a speed sensor which is controlled by the box and engages overdrive. The speed sensor has a speedo cable going from one end of the transmission, to an intermediary transfer with 2 14ga wires on it. These two cables go up to the control box, the control box has power, ground, speed sensor (2 wires) and plus your foot switch....You really need that speed sensor and the control box because the control box also has a toggle switch that allows you to choose Manual Shift or Auto Shift (for the OD) Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s

Re: gear vendors overdrive - someone with a little knwldge [Re: Pyper70] #1563861 01/16/14 07:07 AM 01/16/14 07:07 AM
Joined: Mar 2011 Posts: 136 Oceanside CA R relax383 member
relax383 member R Joined: Mar 2011 Posts: 136 Oceanside CA	I have one in my 67 Barracuda dimmer switch to activate.... don't need the boxes but not sure how to wire it. was easier for me GV is close to where I live.

Re: gear vendors overdrive - someone with a little knwldge [Re: relax383] #1563862 01/16/14 03:48 PM 01/16/14 03:48 PM
Joined: Jan 2010 Posts: 12 So. Cal. Z zhandfull member
zhandfull member Z Joined: Jan 2010 Posts: 12 So. Cal.	I think it's just a 12V solenoid that engages the unit. Could probably run it with a switch and/or relay directly without all the electronics. The issue is it has to disengage every time you slow down to less than 10-15mph to avoid damaging the unit. It would be easy to get distracted and forget about it. Is it worth damaging the unit? I recommend just getting all the electronics, speed control and switches to make it operated as designed with a automatic or manual mode. These items can be found on ebay from time to time. I have one in a 68 dart with 4:10 gears and love it.

Re: gear vendors overdrive - someone with a little knwldge [Re: zhandfull] #1563863 01/16/14 04:01 PM 01/16/14 04:01 PM
Joined: Mar 2008 Posts: 860 lancaster,california johnnycuda super stock
johnnycuda super stock Joined: Mar 2008 Posts: 860 lancaster,california	I have a GV in my 'Cuda,I used to have it a D200 truck I used to have, when I installed it in the 'Cuda I did not use the boxes or foot swithch, only a toggle to activate the overdrive. I did this as my 727 does not have a speedo gear in it, and my trans has a reverse manual valve body so the kickdown isn't there either. I used to sell them at my previous job and I asked GV about what I planned to do and was told as long as I didn't make a habit of leaving the toggle turned on,( turn it off when coming to a stop) it wouldn't be a problem. If I was to leave it on when pulling from stops etc., I could burn up the overdrive unit. The reason being I wasn't using the control box and speedo cable adapter. My car has 4.56's with a 295/55-15 tire, and the rpm is 3000@70mph. You can purchase those items separately, they will need to know what gear ratio and tire diameter you have to provide you with the correct speedo gear. 1970 'Cuda,Lime Light,499 Indy S/R's 10.70's @125,street driven ALOT! 1966 Barracuda 360,now a 5spd,Hemi Orange,Hot Rod Air, New daily driver-2003 Ram 2500 Cummins 5.9 '69 Valiant 2-dr, sleeper! New project---1938 Dodge truck, plan is a 360 with a A500, AC, Calvert rear susp., rack and pinion front with coils.

Re: gear vendors overdrive - someone with a little knwldge [Re: Tim L] #1563864 01/16/14 10:15 PM 01/16/14 10:15 PM
Joined: Nov 2003 Posts: 3,430 Dandridge TN D Dabee master
Dabee master D Joined: Nov 2003 Posts: 3,430 Dandridge TN	You don't need the control boxes. Wire the solenoid through any switch and manually activate it. I did away with the control boxes on mine and manualy activate it using a floor jointed dimmer switch. All you need to remember is don't activate it below 45 mph. You need enough rpm to build pressure to ingage the cone clutch.

Re: gear vendors overdrive - someone with a little knwldge [Re: Dabee] #1563865 01/17/14 08:46 AM 01/17/14 08:46 AM
Joined: Jun 2008 Posts: 10,847 Oakdale CT gdonovan I Live Here
gdonovan I Live Here Joined: Jun 2008 Posts: 10,847 Oakdale CT	Plumb a pressure switch in the governor circuit, just like a A-500 conversion. "I think its got a hemi"

Re: gear vendors overdrive - someone with a little knwldge [Re: Tim L] #1563866 01/17/14 05:17 PM 01/17/14 05:17 PM
Joined: Jan 2003 Posts: 25,808 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,808 Rio Linda, CA	The GV unit has an internal hydraulic pump that pressurizes a cone clutch to engage the OD. The solenoid valve controls the fluid flow to the clutch so, when the trans output shaft isn't turning, there is no pump output and (I'm spitballing here) the clutch would disengage the OD...IOW, if the solenoid valve is energized and the car is at a standstill there would be no OD but the OD would engage as soon as the pump output is sufficient. The INTERNET, the MISinformation superhighway

Re: gear vendors overdrive - someone with a little knwldge [Re: John_Kunkel] #1563867 01/17/14 08:28 PM 01/17/14 08:28 PM
Joined: Nov 2003 Posts: 3,430 Dandridge TN D Dabee master
Dabee master D Joined: Nov 2003 Posts: 3,430 Dandridge TN	Quote: The GV unit has an internal hydraulic pump that pressurizes a cone clutch to engage the OD. The solenoid valve controls the fluid flow to the clutch so, when the trans output shaft isn't turning, there is no pump output and (I'm spitballing here) the clutch would disengage the OD...IOW, if the solenoid valve is energized and the car is at a standstill there would be no OD but the OD would engage as soon as the pump output is sufficient. John you are correct. But, GV recommends not engaging the unit below 45 mph. This is to keep the cone from slipping until sufficient pressure to engage the cone clutch is generated. The control unit does that when wired into the system. Since he doesn't have the control box, he needs to manually engage and disengage the GV when passing through 45mph to keep the cone from slipping and causing premature wear.

Re: gear vendors overdrive - someone with a little knwldge [Re: Dabee] #1563868 01/17/14 11:23 PM 01/17/14 11:23 PM
Joined: Jan 2003 Posts: 12,085 Benton, IL. D DaveRS23 Special needs idiot
DaveRS23 Special needs idiot D Joined: Jan 2003 Posts: 12,085 Benton, IL.	I wonder why GV did not use pressure rather than speed to switch the unit into and out of OD? Wouldn't different rear gear ratios result in different speeds at which the minimum pressure would be achieved? Master, again and still

Re: gear vendors overdrive - someone with a little knwldge [Re: DaveRS23] #1563869 01/18/14 12:44 AM 01/18/14 12:44 AM
Joined: Nov 2003 Posts: 3,430 Dandridge TN D Dabee master
Dabee master D Joined: Nov 2003 Posts: 3,430 Dandridge TN	The GV kit includes an electronic speedometer sensor that sends a signal to the control unit to engage the GV at approximately 45 mph. Yes the exact speed depends on your rear gear ratio, however the sensor is only looking at the GV out put speed, which is the same as the GV input speed prior to going into overdrive.

Re: gear vendors overdrive - someone with a little knwldge [Re: Dabee] #1563870 01/18/14 09:45 AM 01/18/14 09:45 AM
Joined: Jun 2008 Posts: 10,847 Oakdale CT gdonovan I Live Here
gdonovan I Live Here Joined: Jun 2008 Posts: 10,847 Oakdale CT	Quote: The GV kit includes an electronic speedometer sensor that sends a signal to the control unit to engage the GV at approximately 45 mph. Again, this can be duplicated with a simple pressure switch in the governor circuit for Mopar applications. See A-500 or 518 overdrive transmission upgrade threads. "I think its got a hemi"

Re: gear vendors overdrive - someone with a little knwldge [Re: Dabee] #1563871 01/18/14 10:34 AM 01/18/14 10:34 AM
Joined: Nov 2006 Posts: 319 Northern Va M Mopar73340 enthusiast
Mopar73340 enthusiast M Joined: Nov 2006 Posts: 319 Northern Va	Quote: Quote: The GV unit has an internal hydraulic pump that pressurizes a cone clutch to engage the OD. The solenoid valve controls the fluid flow to the clutch so, when the trans output shaft isn't turning, there is no pump output and (I'm spitballing here) the clutch would disengage the OD...IOW, if the solenoid valve is energized and the car is at a standstill there would be no OD but the OD would engage as soon as the pump output is sufficient. John you are correct. But, GV recommends not engaging the unit below 45 mph. This is to keep the cone from slipping until sufficient pressure to engage the cone clutch is generated. The control unit does that when wired into the system. Since he doesn't have the control box, he needs to manually engage and disengage the GV when passing through 45mph to keep the cone from slipping and causing premature wear. Not trying to start a pissing contest here but the above is true when the control box is in AUTO mode. When the control box is in MANUAL mode and the switch to engage the unit is turned on the OD will engage at any speed above 20MPH +- If left in the on mode as you come to a stop the control box will disengage the OD at 20MPH +- I would think that if there was a possibility of damaging the unit by turning it on below 45MPH that the control box would not allow this to happen in manual mode.

Re: gear vendors overdrive - someone with a little knwldge [Re: Mopar73340] #1563872 01/18/14 02:44 PM 01/18/14 02:44 PM
Joined: Jan 2003 Posts: 12,085 Benton, IL. D DaveRS23 Special needs idiot
DaveRS23 Special needs idiot D Joined: Jan 2003 Posts: 12,085 Benton, IL.	So, the key to the success of the unit is the speed of the tranny's output shaft so that there is enough pump speed to generate enough pressure to keep the cone engaged? Right? Vehicle speed is not important, just tranny output shaft speed. So the pressure switch is a better choice. Right? Master, again and still

Re: gear vendors overdrive - someone with a little knwldge [Re: DaveRS23] #1563873 01/19/14 12:26 AM 01/19/14 12:26 AM
Joined: Nov 2003 Posts: 3,430 Dandridge TN D Dabee master
Dabee master D Joined: Nov 2003 Posts: 3,430 Dandridge TN	Quote: So, the key to the success of the unit is the speed of the tranny's output shaft so that there is enough pump speed to generate enough pressure to keep the cone engaged? Right? Vehicle speed is not important, just tranny output shaft speed. So the pressure switch is a better choice. Right? You can use a pressure switch to control it but you will have no control over the GV. Do you really want it to shift into overdrive while you are still in first gear? With a manual switch you have control. I have a reverse manual valve body in my trans. I run through the gears then shift it into overdrive. It's like having a four speed. Around town I leave the the overdrive disengaged.

Re: gear vendors overdrive - someone with a little knwldge [Re: Dabee] #1563874 01/19/14 01:10 AM 01/19/14 01:10 AM
Joined: Jan 2003 Posts: 12,085 Benton, IL. D DaveRS23 Special needs idiot
DaveRS23 Special needs idiot D Joined: Jan 2003 Posts: 12,085 Benton, IL.	So, pressure switch plus a manual switch. Got it. Thanks. Master, again and still

Re: gear vendors overdrive - someone with a little knwldge [Re: DaveRS23] #1563875 01/19/14 02:38 AM 01/19/14 02:38 AM
Joined: May 2003 Posts: 6,562 Downtown Roebuck Ont Twostick Still wishing...
Twostick Still wishing... Joined: May 2003 Posts: 6,562 Downtown Roebuck Ont	Sounds simple. Manual switch thru a Hobbs pressure switch, no pressure, no OD. Kevin

Re: gear vendors overdrive - someone with a little knwldge [Re: Dabee] #1563876 01/19/14 10:55 AM 01/19/14 10:55 AM
Joined: Jun 2008 Posts: 10,847 Oakdale CT gdonovan I Live Here
gdonovan I Live Here Joined: Jun 2008 Posts: 10,847 Oakdale CT	Quote: You can use a pressure switch to control it but you will have no control over the GV. Do you really want it to shift into overdrive while you are still in first gear? This will depend on what psi pressure switch you are using, there is no reason you can't make it fully auto with a pressure switch and WOT switch. Been through this all this with a 44RH upgrade. "I think its got a hemi"

Re: gear vendors overdrive - someone with a little knwldge [Re: Dabee] #1563877 01/19/14 06:12 PM 01/19/14 06:12 PM
Joined: Jan 2003 Posts: 25,808 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,808 Rio Linda, CA	Quote: John you are correct. But, GV recommends not engaging the unit below 45 mph. This is to keep the cone from slipping until sufficient pressure to engage the cone clutch is generated. That contradicts the GV instructions which set the magic number at 20 MPH. http://www.gearvendors.com/operationtips.html At any rate, logic would dictate that cone-clutch activation should coincide with maximum pump output pressure (at whatever speed that occurs)...my spitballing was theoretic. The INTERNET, the MISinformation superhighway

Re: gear vendors overdrive - someone with a little knwldge [Re: John_Kunkel] #1563878 01/24/14 07:08 AM 01/24/14 07:08 AM
Joined: Nov 2007 Posts: 33 Indianpolis ,IN - VIC, Austr... Tim L OP member
Tim L OP member Joined: Nov 2007 Posts: 33 Indianpolis ,IN - VIC, Austr...	Thanks for the help!

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