72HCODE
"My World is Fire and Blood"
Lets talk a little about the confusing world of the C6 transmission and what Servos and Levers mean:
I'm a transmission novice But i wanted to understand a little about why people want certain servos and levers inside their transmission.
the servo comes on at different pressures they have different piston diameters that customize how the transmission shifts gears, you can have a soft shift like in a
luxury car or a firm shift like in a race car.
the Levers multiply the force of the servo and hold the band clutch, the harder the band holds the less power slip you have.
From Softest to Most firm
CODE ON COVER, APPLY DIA, RELEASE DIA, SEAL TYPE
N 1.93 2.92 Molded piston
S 2.00 2.86 Molded piston
G 2.04 3.02 O-rings
J 2.07 2.69 O-rings
L 2.07 2.98 Molded piston
D 2.08 2.98 O-rings
P 2.10 2.86 Molded Piston
H 2.34 3.02 O-rings
R 2.48 3.50 O-rings
the levers...
A = 1.65:1
B = 1.73:1
D = 1.97:1
E = 1.85:1
H = 2.18:1
F = 2.30:1
FF = 2.82:1
Intermediate servo apply levers are identified by a large cast letter.
The ratio say an 'E' multiplies band apply force by 1.85 times.
The higher the ratio the the greater the band force(to keep it from slipping)
but the slower the actuation speed
What all this means is holding the 2nd gear Band with greater and great force which offers greater holding power, giving cleaner, firmer 1-2 and 2-3 shifts.
there is a limit as too much band force can crack or explode the side of the C6 aluminum case by the band adjuster stud and nut.
using the R code and a FF lever is not a good idea, F or H is much safer.
Now you can improve street performance by changing the Servo you have to a firmer one, a lever change requires the transmission come out of the car.
This is because the shaft for the lever has to come out from behind the torque converter along with the plug.
the servo is almost a hot swap option as you can access it on the car without taking too much apart, thus swapping to a firmer servo improves street performance.
All C6s were not the same:
Ford took advantage of the servos and levers in the C6 so when you ordered a higher HP engine you got a firmer servo and a lever that held more force.
all those Tags on the C6 transmission on the servo cover have some extra meaning as you want to try and find a transmission from a 4V verse a 2V
The big block cars had a different bolt pattern for the block, but the 302 and 351 had the same bolt pattern.
(the top 2 bolts on the trans were about 5" apart for small block. on a big block the bolt pattern is over 7" apart)
so as decode example:
PGA-AH 71 351-4v Mustang
PGA-AU 71 351CJ-4v Mustang
PGA-AU1 72 351CJ-4v Mustang
PGA-AU2 72 351CJ-4v Mustang
PGA-AV 71 351-2v Mustang
PGA-AV1 72 351-2v Mustang
PGA-AV2 73 351-2V Mustang EGR.
PJC-G 71 429 Mustang
PJC-G1 72 351-4v Mustang
in this case the PGA-AV2 Had a "N" servo and a "B" lever making it a very soft shifting transmission smooth slow shifts.
the PGA-AU2 Had a "J" servo and a "D" lever making it much have much firmer and harder shifts with more power transfer.
You can of course go nuts and build a C6 any way you want, there are tons of Aftermarket CNC machined "R" code and "RR" code servos that are even firmer then ford ever made
and "FF" levers that apply so much force you have to re-enforce the C6 case to use them.
you can also buy CNC machined Drums or certain Year C6 parts that allow more Clutches to be installed "4 verse 5" as well as planetary Gears from heavy trucks that have 4 gears instead of 3, which are
stronger and alter the final drive ratio to be lower. there are also after market gears with 5 gears that are even lower ratio and offer a low friction alternative.
you could spend 1000$+ of dollars in a C6 just trying to build the most insane one on the planet.
Anyway as a novice i found the whole thing interesting and answered some of my questions on why people wanted certain C6 parts.
since I'm a novice I'm sure I have missed something feel free to chime in and offer corrections or additional information.
For me I'm working on rebuilding a C6 transmission and I happen to have one transmission with damaged case and bad internals but with a better lever and servo combo, and another trans in good shape but with soft servo and lever combination.
So i plan to transfer the parts from one to the other and make a better overall C6.
Thanks for reading
I'm a transmission novice But i wanted to understand a little about why people want certain servos and levers inside their transmission.
the servo comes on at different pressures they have different piston diameters that customize how the transmission shifts gears, you can have a soft shift like in a
luxury car or a firm shift like in a race car.
the Levers multiply the force of the servo and hold the band clutch, the harder the band holds the less power slip you have.
From Softest to Most firm
CODE ON COVER, APPLY DIA, RELEASE DIA, SEAL TYPE
N 1.93 2.92 Molded piston
S 2.00 2.86 Molded piston
G 2.04 3.02 O-rings
J 2.07 2.69 O-rings
L 2.07 2.98 Molded piston
D 2.08 2.98 O-rings
P 2.10 2.86 Molded Piston
H 2.34 3.02 O-rings
R 2.48 3.50 O-rings
the levers...
A = 1.65:1
B = 1.73:1
D = 1.97:1
E = 1.85:1
H = 2.18:1
F = 2.30:1
FF = 2.82:1
Intermediate servo apply levers are identified by a large cast letter.
The ratio say an 'E' multiplies band apply force by 1.85 times.
The higher the ratio the the greater the band force(to keep it from slipping)
but the slower the actuation speed
What all this means is holding the 2nd gear Band with greater and great force which offers greater holding power, giving cleaner, firmer 1-2 and 2-3 shifts.
there is a limit as too much band force can crack or explode the side of the C6 aluminum case by the band adjuster stud and nut.
using the R code and a FF lever is not a good idea, F or H is much safer.
Now you can improve street performance by changing the Servo you have to a firmer one, a lever change requires the transmission come out of the car.
This is because the shaft for the lever has to come out from behind the torque converter along with the plug.
the servo is almost a hot swap option as you can access it on the car without taking too much apart, thus swapping to a firmer servo improves street performance.
All C6s were not the same:
Ford took advantage of the servos and levers in the C6 so when you ordered a higher HP engine you got a firmer servo and a lever that held more force.
all those Tags on the C6 transmission on the servo cover have some extra meaning as you want to try and find a transmission from a 4V verse a 2V
The big block cars had a different bolt pattern for the block, but the 302 and 351 had the same bolt pattern.
(the top 2 bolts on the trans were about 5" apart for small block. on a big block the bolt pattern is over 7" apart)
so as decode example:
PGA-AH 71 351-4v Mustang
PGA-AU 71 351CJ-4v Mustang
PGA-AU1 72 351CJ-4v Mustang
PGA-AU2 72 351CJ-4v Mustang
PGA-AV 71 351-2v Mustang
PGA-AV1 72 351-2v Mustang
PGA-AV2 73 351-2V Mustang EGR.
PJC-G 71 429 Mustang
PJC-G1 72 351-4v Mustang
in this case the PGA-AV2 Had a "N" servo and a "B" lever making it a very soft shifting transmission smooth slow shifts.
the PGA-AU2 Had a "J" servo and a "D" lever making it much have much firmer and harder shifts with more power transfer.
You can of course go nuts and build a C6 any way you want, there are tons of Aftermarket CNC machined "R" code and "RR" code servos that are even firmer then ford ever made
and "FF" levers that apply so much force you have to re-enforce the C6 case to use them.
you can also buy CNC machined Drums or certain Year C6 parts that allow more Clutches to be installed "4 verse 5" as well as planetary Gears from heavy trucks that have 4 gears instead of 3, which are
stronger and alter the final drive ratio to be lower. there are also after market gears with 5 gears that are even lower ratio and offer a low friction alternative.
you could spend 1000$+ of dollars in a C6 just trying to build the most insane one on the planet.
Anyway as a novice i found the whole thing interesting and answered some of my questions on why people wanted certain C6 parts.
since I'm a novice I'm sure I have missed something feel free to chime in and offer corrections or additional information.
For me I'm working on rebuilding a C6 transmission and I happen to have one transmission with damaged case and bad internals but with a better lever and servo combo, and another trans in good shape but with soft servo and lever combination.
So i plan to transfer the parts from one to the other and make a better overall C6.
Thanks for reading