C-6 adjustments
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C-6 adjustments
Just had the c-6 in a '73, 2 WD F-250 rebuilt.
Engine is a 460, 3.31 Dana rear and 7.50 x 16 (32") tires.
The shifting manually is fine and under close to WOT is ok, just a little quick or maybe should say early as it is in 3rd by 40 mph.
There is a new modulator, and it has been adjusted to several positions without really changing anything.
It appears that the governor is not building enough line pressure to hold the shift points like it should. It is the same governor that was in it before, but I doubt the original to the truck, as are many parts...........
Is there a governor spring assortment to adjust the governor like is available for the GM trans?
And some kind of instructions as to what to change to change things?
or is there a way to get the proper new springs for the governor for this truck??????????
Engine is a 460, 3.31 Dana rear and 7.50 x 16 (32") tires.
The shifting manually is fine and under close to WOT is ok, just a little quick or maybe should say early as it is in 3rd by 40 mph.
There is a new modulator, and it has been adjusted to several positions without really changing anything.
It appears that the governor is not building enough line pressure to hold the shift points like it should. It is the same governor that was in it before, but I doubt the original to the truck, as are many parts...........
Is there a governor spring assortment to adjust the governor like is available for the GM trans?
And some kind of instructions as to what to change to change things?
or is there a way to get the proper new springs for the governor for this truck??????????
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yep, right now it shifts 1-2 -3 almost without detection with light throttle and will not come back to 1 without almost stopping
adjusting the modulator has had little to no effect
I am using type F fluid, all 13 quarts of it to fill it, new torque converter......
my understanding is the governor is not letting it build enough pressure?????????
adjusting the modulator has had little to no effect
I am using type F fluid, all 13 quarts of it to fill it, new torque converter......
my understanding is the governor is not letting it build enough pressure?????????
Cargo Master
Joined: Jun 2003
Posts: 2,982
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From: Somewhere Saskatchewan
Governors don't build pressure but yours could be hanging up.
If it was just rebuilt why not return it?
There may be a shift kit installed and some will result in an early shift pattern.
The modulator pin may be too short, there are 4 different lengths, longer being a higher, firmer shift point.
If it was just rebuilt why not return it?
There may be a shift kit installed and some will result in an early shift pattern.
The modulator pin may be too short, there are 4 different lengths, longer being a higher, firmer shift point.
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already back to shop that rebuilt it, he's gonna fix it, whether the modulator or governor or whatever, he says no shift kit installed
looking more for my understanding of what needs to be done
modulator is new, for the application, could the pin have been wrong in the new unit?
looking more for my understanding of what needs to be done
modulator is new, for the application, could the pin have been wrong in the new unit?
Cargo Master
Joined: Jun 2003
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From: Somewhere Saskatchewan
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Do you know of any good websites that explain the workings of the C6 and rebuilding info? Is there a book you would recommend? Thanks...Jack
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Cargo Master
Joined: Jun 2003
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From: Somewhere Saskatchewan
Nice to have a tranny expert on here helping and from Canada to boot. I went to my first airshow in Moose Jaw when I was 14. Watched the show Saturday then went to the theater and watched Top Gun(1986) that night and back to the airshow on Sunday. It was a great weekend in Moose Jaw.
Do you know of any good websites that explain the workings of the C6 and rebuilding info? Is there a book you would recommend? Thanks...Jack
Do you know of any good websites that explain the workings of the C6 and rebuilding info? Is there a book you would recommend? Thanks...Jack
I helped a guy in Kansas via webcam one time.
Got an all expense paid trip to Albuquerque to build a Mustang transmission.
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well I pulled the modulator to check the pin length, yep, you guessed it, 1.673
so I have the longest pin
the trans shifts and seems to function properly if I drive it like I have boots on, but seems way too early and soft shifting when driving like I have an egg between my foot and the foot feed..............just would like it to shift more definite and not so early when trying to get a little better gas mileage...........460 is always thirsty
supposed to have the rebuilder look at it on Thursday, and he will stand behind his build, have dealt with him many times over the last 25 years so I am not worried, just curious
so I have the longest pin
the trans shifts and seems to function properly if I drive it like I have boots on, but seems way too early and soft shifting when driving like I have an egg between my foot and the foot feed..............just would like it to shift more definite and not so early when trying to get a little better gas mileage...........460 is always thirsty
supposed to have the rebuilder look at it on Thursday, and he will stand behind his build, have dealt with him many times over the last 25 years so I am not worried, just curious
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Thanks Stuart. My tranny may last for years so hopefully you will still be visiting this place when the time comes. Heck, my 2000 Chevy will probably need a rebuild before the Ford. I'm sure you have done many 4L60E's. I found a shop manual at the library for 67-79 Ford tranny's and it has all the specs and tests in it. Might try some of that this summer.
This book I have has the shift points. 77 Lincoln 460(no trucks in it) 3.00:1 rear end says :
throttle closed (above 17" vacuum) 2-3 shift 280-660 rpm 8-12 mph
to detent (torque demand) 2-3 shift 1220-2040 rpm 34-56 mph
through detent (WOT) 2-3 shift 2380-2730 rpm 66-75 mph
Hopefully Stuart will explain what to and through detent means and what exactly torque demand means cause I can't find any explanation in this book.
Found this explanation.
http://mustangtek.com/Library2/PDF/ShopTips3-8.pdf
What does "downshift system charged" mean? Guessing it's the kickdown rod doing its job.
well I pulled the modulator to check the pin length, yep, you guessed it, 1.673
so I have the longest pin
the trans shifts and seems to function properly if I drive it like I have boots on, but seems way too early and soft shifting when driving like I have an egg between my foot and the foot feed..............just would like it to shift more definite and not so early when trying to get a little better gas mileage...........460 is always thirsty
supposed to have the rebuilder look at it on Thursday, and he will stand behind his build, have dealt with him many times over the last 25 years so I am not worried, just curious
so I have the longest pin
the trans shifts and seems to function properly if I drive it like I have boots on, but seems way too early and soft shifting when driving like I have an egg between my foot and the foot feed..............just would like it to shift more definite and not so early when trying to get a little better gas mileage...........460 is always thirsty
supposed to have the rebuilder look at it on Thursday, and he will stand behind his build, have dealt with him many times over the last 25 years so I am not worried, just curious
throttle closed (above 17" vacuum) 2-3 shift 280-660 rpm 8-12 mph
to detent (torque demand) 2-3 shift 1220-2040 rpm 34-56 mph
through detent (WOT) 2-3 shift 2380-2730 rpm 66-75 mph
Hopefully Stuart will explain what to and through detent means and what exactly torque demand means cause I can't find any explanation in this book.
Found this explanation.
http://mustangtek.com/Library2/PDF/ShopTips3-8.pdf
What does "downshift system charged" mean? Guessing it's the kickdown rod doing its job.
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
Thanks Stuart. My tranny may last for years so hopefully you will still be visiting this place when the time comes. Heck, my 2000 Chevy will probably need a rebuild before the Ford. I'm sure you have done many 4L60E's. I found a shop manual at the library for 67-79 Ford tranny's and it has all the specs and tests in it. Might try some of that this summer.
This book I have has the shift points. 77 Lincoln 460(no trucks in it) 3.00:1 rear end says :
throttle closed (above 17" vacuum) 2-3 shift 280-660 rpm 8-12 mph
to detent (torque demand) 2-3 shift 1220-2040 rpm 34-56 mph
through detent (WOT) 2-3 shift 2380-2730 rpm 66-75 mph
Hopefully Stuart will explain what to and through detent means and what exactly torque demand means cause I can't find any explanation in this book.
Found this explanation.
http://mustangtek.com/Library2/PDF/ShopTips3-8.pdf
What does "downshift system charged" mean? Guessing it's the kickdown rod doing its job.
This book I have has the shift points. 77 Lincoln 460(no trucks in it) 3.00:1 rear end says :
throttle closed (above 17" vacuum) 2-3 shift 280-660 rpm 8-12 mph
to detent (torque demand) 2-3 shift 1220-2040 rpm 34-56 mph
through detent (WOT) 2-3 shift 2380-2730 rpm 66-75 mph
Hopefully Stuart will explain what to and through detent means and what exactly torque demand means cause I can't find any explanation in this book.
Found this explanation.
http://mustangtek.com/Library2/PDF/ShopTips3-8.pdf
What does "downshift system charged" mean? Guessing it's the kickdown rod doing its job.
THROUGH DETENT IS PASSING GEAR OR KICKDOWN.
DOWNSHIFT SYSTEM CHARGED MEANS THE PASSING GEAR OR KICKDOWN CIRCUIT IS PRESSURIZED.
Lead Driver
Joined: Mar 2004
Posts: 8,922
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Modulator pins were recently discussed over on 460ford.com. in the driveline section. The thread is called "C6 modulator pin" by money-pit. Look at answer #4. I strongly recommend that anyone interested read this. Great imfo that clears things up.
Fleet Mechanic
Joined: Aug 2010
Posts: 1,574
Likes: 6
From: Cranbrook, Ont., Canada
stuart1, badshoe productions has video on the C6. I bought it a couple of months ago and found it informative and VERY helpful in rebuilding my C6. I put a Transgo shift kit in it while I have it out. John
