ford c4 governor spring
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 384
Likes: 9
From: Batavia, Ohio
ford c4 governor spring
i have a c4 in my '77 f150 and the governor is out of a mustang which in turn makes it shift into drive at 18mph, does any have or know where i can get a heavier governor spring to delay the shifts thanks marty
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 384
Likes: 9
From: Batavia, Ohio
that just makes it shift harder or softer, made no difference in the shift timing but thanks for the reply
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,570
Likes: 63
From: North Georgia
It should adjust the timing as well are you sure that there is a modulator pin installed in the modulator?
Is there a difference between heavy and light throttle shift points?
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 384
Likes: 9
From: Batavia, Ohio
well my trans builder said he put a longer pin in with the transgo shift kit instructions, i'm starting to wonder if it's just not long enough-I actually got the trans valvebody and governor out of a late 70's car but recently bought a governor for a '78-79 f150 302 c4, my exact setup making no difference. A guy on ford muscle sells a softer spring and says to drill and lighten one of the plungers and it will shift the way it should. The cam pulls 15in of vaccum in park so it's not terrible but i've heard that does make a big difference with shift timing though
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,570
Likes: 63
From: North Georgia
Your C4 may have a spring and check valve that sits under the filter, if this valve is missing or in upside down it will stack shift regardless what is done to the modulator. This is the throttle relief valve when it is missing there will be no throttle pressure for the back side of the governor valve and it up shifts quickly when the drive shaft spins.
Valve first then the spring held in place by the filter.
Valve first then the spring held in place by the filter.
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 384
Likes: 9
From: Batavia, Ohio
a buddy of mine said to just run the modulator screw all the way in and if it doesn't shift back it out 1/8 of a turn? i never did this because i thought more than 3 turns from all the way wasn't recommended
Trending Topics
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
Modulator pins that come with shift kits should be thrown in the trash.
There are 4 lengths recomended.
1/ 1.601 - 1.611
2/ 1.634 - 1.644
3/ 1.650 - 1.660
4/ 1.667 - 1.677
Each longer pin will allow a later shift.
I use a piece of metal coat hanger. Just round the ends.
Some truck governors had a huge primary weight which allowed much earlier shifts. You may have to get a different governor.
There are 4 lengths recomended.
1/ 1.601 - 1.611
2/ 1.634 - 1.644
3/ 1.650 - 1.660
4/ 1.667 - 1.677
Each longer pin will allow a later shift.
I use a piece of metal coat hanger. Just round the ends.
Some truck governors had a huge primary weight which allowed much earlier shifts. You may have to get a different governor.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 384
Likes: 9
From: Batavia, Ohio
Modulator pins that come with shift kits should be thrown in the trash.
There are 4 lengths recomended.
1/ 1.601 - 1.611
2/ 1.634 - 1.644
3/ 1.650 - 1.660
4/ 1.667 - 1.677
Each longer pin will allow a later shift.
I use a piece of metal coat hanger. Just round the ends.
Some truck governors had a huge primary weight which allowed much earlier shifts. You may have to get a different governor.
There are 4 lengths recomended.
1/ 1.601 - 1.611
2/ 1.634 - 1.644
3/ 1.650 - 1.660
4/ 1.667 - 1.677
Each longer pin will allow a later shift.
I use a piece of metal coat hanger. Just round the ends.
Some truck governors had a huge primary weight which allowed much earlier shifts. You may have to get a different governor.
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 384
Likes: 9
From: Batavia, Ohio
Also the driveshaft yoke is really loose going into the tailshaft-i have replaced the bushing twice, i even had a new ford yoke to test fit with no luck. I just bought a ford bushing so hopefully it's alot tighter, The truck is 133''wb and i'm running a 72.5'' long driveshaft, theres 4' of yoke showing but it goes into the tailshaft 2.5''. I mean you can move it up and down at least a quarter inch, horrible unbearable vibration above 45mph-what gives?
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
Some C4's have an antigrunt sleeve on the output shaft.
If your yoke isn't machined to accept it you will have a problem.
By the sound of it you better do some corrective surgery in that area before everything is ready for PB&J.
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 384
Likes: 9
From: Batavia, Ohio
If you swapped from car to truck you went the wrong way.
Some C4's have an antigrunt sleeve on the output shaft.
If your yoke isn't machined to accept it you will have a problem.
By the sound of it you better do some corrective surgery in that area before everything is ready for PB&J.
Some C4's have an antigrunt sleeve on the output shaft.
If your yoke isn't machined to accept it you will have a problem.
By the sound of it you better do some corrective surgery in that area before everything is ready for PB&J.
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 384
Likes: 9
From: Batavia, Ohio
will screwing the modulator all the way in and barely turned out going to be the same as running a longer pin back out more-as far as how firm it will shift?
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
But this is only minor adjustments.
Remove the screw and see how it works.