What has to be done to change shift points on a 727 tranny on 69 Roadrunner?

[1Bad70Charger]

I have a torque flight 727 in my 69 Roadunner with 3.91 gears, and soon will be putting in a new dynamic 9.5 inch street/strip converter along with a Transgo TF 2 shift kit in my 727 tranny.  

I want to adjust my shift point for the car to shift around 6200 rpm and currently it shifs around 5300 rpm.  I am not a mechanic but I would think that some adjustment needs to be made to the the tranny itself to change the shift points on a tf 727 B-Body Mopar.

How exactly does one change the shift points, as a local mechanic told me it is done by changing the length of the throttle cable (or something like that not positive exactly what he said) but it had nothing to do with going inside the 727 tranny itself so now I am curious how this is done?

Thanks in advance.  

[RD]

simply:

http://www.aandatrans.com/Departments/Chrysler-727-Trans/Governor-Kits.aspx

*edit* guess i should explain more

this will raise your shift point, but dependent upon throttle pressure and your placement of the accelerator pedal due to pressure placed upon it by said foot at different driving conditions will truly determine where your vehicle shifts at.

i.e.  governor kits get you in the ball park if all things are equal, but each driver drives differently so shift points are relative to the driver and trans mods.

jk may chime in on this as he has messed with governors alot more than i have, but these puppies are made for specific tolerances.  any "shade tree" modifications can cause "booms".

[1Bad70Charger]

Great info and link RD! 

Simpleton question for someone who has no knowledge on this topic  where does this governor get installed (inside the tranny I would assume)? 

[TylerCharger69]

Ummmm.....The govenor's mansion?........lol.....sorry...I couldn't resist!!!

[RD]

the governor is located on the output shaft of the transmission and can be replaced by removing the tailshaft housing.  there is a "pin" that is secured by two "e" clips as the entire governor assembly consists of 5 components (9 including clips).  You remove governor by removing the snap ring and the "e" clip that is located on the pin retaining the governor.  The governor assembly will then slide out of the governor housing (or mansion according to tyler ) and you can put the new one in using reverse order.

[1Bad70Charger]

Great info RD, thanks man! 

[John_Kunkel]

Keep in mind that if you want both the 1-2 and 2-3 shifts to occur at a certain rpm the governor kit might not accomplish it by itself, in many cases you'll also need the addition of different springs under the shift valves.

IOW, the 6000+ kit might shift 1-2 at 6000 and the 2-3 at 6300, in this case a stiffer spring is needed for the 1-2 shift valve to delay its shift.

Why not just manually shift at the rpm you want and save money and hassle?

[1Bad70Charger]

Keep in mind that if you want both the 1-2 and 2-3 shifts to occur at a certain rpm the governor kit might not accomplish it by itself, in many cases you'll also need the addition of different springs under the shift valves.

IOW, the 6000+ kit might shift 1-2 at 6000 and the 2-3 at 6300, in this case a stiffer spring is needed for the 1-2 shift valve to delay its shift.

Why not just manually shift at the rpm you want and save money and hassle?

Certainly could do that and will do that at times, but easier to screw up with manual shifting with the stock column shifter on my 69 Roadrunner (and no rev limiter)! 

[Cooter]

MSD 6 AL with rev limiter....Set the pill at 6000 And shift it manually...

[firefighter3931]

MSD 6 AL with rev limiter....Set the pill at 6000 And shift it manually...

Exactly ! 


Ron

[375instroke]

I'm sure that the Trans-Go kit will do something to the shift points.  As the governor rotates faster and faster, as the output shaft increases in speed, this moves the weights outward against the springs in it.  This causes the governor pressure to increase.  This speed/pressure relationship can only be changed by changing governor weights or springs.  Lighter weights or stronger springs would decrease the pressure relative to the RPM.  The throttle pressure is controlled by linkage connected to the carb.  If you lengthen the linkage, you will increase the throttle pressure relative to the throttle position.  Inside the valve body, there are shuttle valves that direct pressure to the various servos that shift the transmission.  Governor pressure acts on one side of these valves, and throttle pressure on the other, so you can see that the one with the greatest pressure wins.  Light throttle pressure on one side is overcome sooner as the governor pressure increases, and causes the trans to shift earlier than if you floored the pedal.  The linkage can only be increased so long in length, however, and the valve in the transmission that it acts upon can bottom out before you achieve the RPM point that you desire.  With the shift kit, the line pressure, throttle pressure, and perhaps the governor pressures, will all change from stock.  I know that there is an adjustment on the valve body for the throttle valve and line pressure.  Trans-Go has you adjust them to their specifications.  I've never looked at how the internal throttle pressure adjustment affects things.

[1Bad70Charger]

Great info 375 stroke!