Thanks for this, I have a 78 with 351M & same trans, believe I would of used a can of gunk to clean that side off first, but then I see there might not be much an issue with getting trash in the hole

This is a very good video. Very informative, thank you very much. Looking forward to more of your videos!

great! sharing the pin length was extremely helpful!!!!

Thank you I think I'm miss that pin.

Don’t know squat about this stuff and just bought a 73 ford f100 with a transplant 302/C6 vintage 1980. Working the bugs out now. Doesn’t have a vacuum line to the modulator that I know of. I’m gonna have to check that out more.

@TheKeymaster316

Жыл бұрын

1980 was a new model year but I would think they would still utilize the modulator. It should mound directly to the transmission and have a rubber line going somewhere to the engine bay. Unless they did something dramatically different for 1980. Good luck!

Excellent information that I really needed. I have a 1975 F100 and I'm having a high rpm shift from 2nd to 3rd. still trying to determine what is the normal range for it to be in. Thank You!

@TheKeymaster316

Жыл бұрын

I installed the black stripe version last year and the shifts are much more firm, so keep that in mind if you’d prefer that. The green stripe was a very average shift. Glad the video was helpful.

@markhubanks3715

Жыл бұрын

Thanks, Do you remember you rpm 2nd to 3rd ? I'm at 53 mph.and 3000 rpm and still in 2nd.

@TheKeymaster316

Жыл бұрын

@@markhubanks3715 definitely not that fast. Last night when I was leaving my brothers house, I slowly drove down his driveway and it shifted into 3rd at 20 mph. Next time I take it for a spin, I’ll see when it shift when I accelerate fairly fast.

@TheKeymaster316

Жыл бұрын

I just found a video of me getting on it pretty hard and it looked to shift into 3rd at right around 40mph. 👍🏻

@REVNUMANEWBERN

11 ай бұрын

So the different stripe Mod is all you need for the change in the shift?? Just swap them out? @@TheKeymaster316

Concerning the carb issue only and not the shift point issue, try the Holley 500 cfm two barrel carb and the difference in throttle response is like night and day. I put one on my 1969 Ford F-250 with a 390 FE engine and it's way better than the old ford carb and I still have the two barrel intake manifold which limits the rev RPM . I'm having the same problem with my shift points after replacing the modulator and they were happening way to fast from 1st to second so I was hoping to find a video how to adjust the screw and if I understand from what you said correctly, I need to turn the screw clockwise to delay the shift point from first to second gear. My friend Chris texted me who is a really good mechanic said try turning the screw counter clockwise and see what happens. 😊

@TheKeymaster316

Жыл бұрын

Yes sir, luckily it’s fairly easy to get to the modulator, so making adjustments isn’t too difficult. I have since went to a black-stripe modulator and it shifts MUCH firmer that this green one. I would love to pick up a smaller CFM carburetor at some point, since this truck isn’t a race truck by any means. Everyone was in my ear about getting a huge carburetor, so that’s the direction I went. Luckily I’ve been able to re-jet it and it runs incredibly now. But I think I most certainly lost some low-end torque with the 770.

@REVNUMANEWBERN

11 ай бұрын

Just bought a 78 F150 351M with the c6, I am considering adding a larger Trans Cooler with stainless flex lines, do you know the SIZE & TYPE threads used on the trans cooling line connections?? @@TheKeymaster316

@TheKeymaster316

11 ай бұрын

@@REVNUMANEWBERN I sure don’t. Hopefully the new one will have those specifications in the documentation.

Mine sputters in reverse and won't really move in reverse unless it's wot then stays stuck at wot could this little vacuum module be my issue for the loss of power in reverse and the sticky throttle

@seth915

29 күн бұрын

I don't think this is your issue as this only adjusts the shift points if im not mistaken i.e 1st 2nd and 3rd

I am not sure what trans I have. 1983 E150 302 5 liter engine. It just has P R N D 2 1. So a day ago it got stuck in low gear. Put it in drive and it will get up to maybe 30 mph and won't shift. I ordered a throttle position sensor online but now I don't think that could be it. My manual says there is a kickdown rod that goes to the carburetor somewhere, the throttle detent stop. I see there is also the governor and the Modulator. My manual Haynes is almost worthless. Thanks for the great video. Did you say where the hose on the modulator goes to? I am not a mechanic but I love this van for some reason.

@TheKeymaster316

Жыл бұрын

I’m pretty sure the modulator on mine has a hose connected to it. That hose eventually connects to a hard line which goes up into the engine bay and connects to somewhere for a vacuum.

So the kickdown rod must be what kicks your transmission to a lower gear when you step on the gas pedal to the metal or floor it.

@TheKeymaster316

Жыл бұрын

Yes sir, that’s correct. And these modulators assist in the shifting process. The one in this video actually went bad a few months ago. It was slipping some kind of bad in first gear. Lots of gas but very slow acceleration. Replaced it and it’s back to normal. 👍🏻

@jamescole3152

Жыл бұрын

@@TheKeymaster316 Thanks

Hello, and how long is the small bar of a vacuum for ford c4 gear box? Thank you

@TheKeymaster316

2 жыл бұрын

Sorry, Alejandro, I’m not familiar with the C4.

your vehicle could use a good pressure washing underneath I did that to a few Vehicles totally worth it

@TheKeymaster316

2 жыл бұрын

I’ve given it some TLC since this video was made. 😁

So, were you actually driving or did you have your truck up on stands? You got to 55 real fast. I cant get my 1983 Ford Bronco up to that speed for a good minute. What could be the cause of this? Band adjustment?

@TheKeymaster316

3 жыл бұрын

Yes sir, that was me driving her out on the road. I have a pretty healthy 460 and a Holley 770. Not sure without seeing yours running what it could be but you have to factor in the fuel delivery, timing, and of course your power plant. You should be able to tell if your transmission is slipping if your rpm’s are going up but your speed isn’t.

@denverkenyon3203

3 жыл бұрын

@@TheKeymaster316 thanks for the info

Is your vacuum line connected to the carburetor or the intake manifold?

@TheKeymaster316

Жыл бұрын

I’m pretty sure it’s connected to the manifold. The hose runs to the backside of the motor and I believe connects to a hard line. Been a minute since I fooled with it.

thanks to this video i find out that my truck its missing this pin

@TheKeymaster316

3 жыл бұрын

No problem, glad I could help!

When I hanged mine the pin wouldn't come out, I'm having issues with my 86 also not shifting to second gear any idea what it could be I also changed the trans filter and still nothing

@TheKeymaster316

3 жыл бұрын

Anthony Marquez not sure why it’s not shifting for ya, but when they start pulling fluid instead of vacuum, that’s when you have to replace em. And you definitely need to transfer the pin to the new modulator. Good luck!

@Uriah625

3 жыл бұрын

Figure out you problem?

@mariaisabelaguilarmedina98

2 жыл бұрын

Yo también tengo ese problema ya le metí todo nuevo ala transmisión pero no hace el segundo cambio que podrá ser también cambie el módulo cómo el q viene en el vídeo y sigue igual alguien que tenga una respuesta a este problema por favor se los agradecería

What happens when the modulator fails? Would it stop you from getting into 3rd?

@TheKeymaster316

2 жыл бұрын

It’s possible. This one that I installed in the video just went bad a few weeks ago, which surprised me given that it wasn’t that old. At a stoplight, I noticed that when I went to take off, I was moving very slowly. I thought it was a coincidence but it kept happening. I swapped the modulator and it fixed it. So I’m not sure if you would lose 3rd gear but if it doesn’t want to shift, it’s worth replacing this to see if it fixed it.

@REVNUMANEWBERN

11 ай бұрын

Would you suggest for someone to get one of these to keep on board ? How often do they fail ? & do they ever fail to just not shift at all?@@TheKeymaster316

Hey, excuse me, I have a question, where is the reverse sensor or bulb since I just bought a 1977 Ford F150 and they adapted an automatic gearbox and when I put it back, the taillights don't come on?

@TheKeymaster316

Жыл бұрын

On manual transmissions, there is a button under the hood that, when you put it in reverse, the linkage under the hood pushes the button in and the light comes on. In an automatic, I’m not 100% sure, but I believe it’s inside the column.

@TheManigoldocancer

Жыл бұрын

@@TheKeymaster316 thank you so much👍🏻👏🏻

My 1989 Ford f150 will not shift into 3rd or overdrive. The fluid looks really good. Could it be the modulator causing my problem?

@TheKeymaster316

3 жыл бұрын

It's cheap enough to give a try, but it sounds like that could be a much more serious issue with the transmission. It's certainly worth a try checking it out though.

@protyusgames4741

3 жыл бұрын

@@TheKeymaster316 ty for your time. I do appreciate it.

@cornbreadandbiscuits1854

2 жыл бұрын

Did you figure it out. I have the same issue

@protyusgames4741

2 жыл бұрын

@@cornbreadandbiscuits1854 No, it hasn't hit high enough priority yet, sorry.

What size wrench do you need

@TheKeymaster316

3 жыл бұрын

1/2”. 👌🏻

Where is the valve located?

@TheKeymaster316

5 жыл бұрын

The vacuum modulator is located right on the front of the transmission. If you climb under the truck, you'll see the the vacuum hose going to the modulator. If you pull the hose off, you can adjust it with a small flat-head screwdriver.

@paddyofurniture705

5 жыл бұрын

@@TheKeymaster316 I came to the conclusion that I have a later model trans.It is all electric no vacuum.Thank You.

What way did you turn it?

@TheKeymaster316

Жыл бұрын

I believe it’s clockwise for a firmer shift.

FYI, the black is a high pressure calve while the green is OEM pressure.

@TheKeymaster316

4 жыл бұрын

jperiodchapin yeah, may have to try the black modulator one of these days.

@MrJeremys2388

3 жыл бұрын

Black is low vaccume. For a truck

@MrJeremys2388

3 жыл бұрын

The black stripe is a small diaphragm/low vacuum modulator and is mainly used in heavier vehicles and trucks. It has a low shift point. This modulator is also popular in performance applications due to the low shift point. The purple stripe has a slightly larger diaphragm and is designed for use in normal to heavier passenger vehicles. It has a medium shift point. The green stripe is similar to the purple stripe, but will provide a slightly later shift point. It is designed for normal passenger vehicle usage and is the most popular modulator used the C6. Please make sure facts are correct

@robertclymer6948

3 жыл бұрын

@@MrJeremys2388 Great info sir. Thanks for sharing! What would you suggest for a C-6 reverse manual valve body ex-race car? Is it even needed? I do have a vacuum line to from trans to manifold port vacuum source. Have not driven on the street yet, doing lots of conversions and work on her.

@Wazoo117

2 жыл бұрын

@@MrJeremys2388 ok, how about the white stripe?

My 81 won't shift into overdrive. I can push it to 55 and beyond I'm sure but it sounds like its red lining and I don't feel it shift after 3rd. I've already replaced the modulator and the spark plugs and distributor cap and rotor, as well as the fuel filter. I can't actually tell if its red lining cause I have no rpm gauge, but as I said it doesn't shift after 3rd and sounds like its running harder than it should be. Any help would be greatly appreciated! Thanks for the video!

@TheKeymaster316

2 жыл бұрын

Unfortunately I don’t have overdrive, so that may be an internal issue inside the transmission. I just have the C6. Trust me, if I get on the highway at 70mph, I’m at around 2700 rpm. Definitely glad I don’t daily drive this truck. Good luck to ya, hopefully it’s a simple solution

@jarrodallen3199

2 жыл бұрын

@@TheKeymaster316 appreciate the quick response! Thing is I'm not 100% sure what tranny I have in there and I know it had an Inline 6 in it but the old man that sold it to me swapped it for what I think is a 351 M but also not sure on that. I'm still a novice when it comes to vehicles especially classics like this, I could very well have a C6 in there, the C6 isnt a 3 speed Automatic Overdrive transmission?

@TheKeymaster316

2 жыл бұрын

@@jarrodallen3199 yes sir, the C6 is just 3 gears. I had an 86 F150 about 25 years ago but can’t remember if that truck had overdrive. If you have the C6, that’s probably the reason your screaming along at 55. You gotta remember, back in 81, most interstates across the country were 55, so not that bad. When the speed limit hit 70 like it is now, without an overdrive, you are really spinning those rpm’s. They make aftermarket OD addons but they are very expensive.

@jarrodallen3199

2 жыл бұрын

@@TheKeymaster316 10-4 makes sense. I guess it's the same answer as always then, keep doing some research. I really appreciate the responses!

@TheKeymaster316

2 жыл бұрын

@@jarrodallen3199 anytime, good luck to ya. 👍🏻

or spray cleaner.

En español

Holly self regulated electric fuel pump, good. Holly over complicated, leaks EVERYWHERE, needs constant adjustments carburetor, BAD. If you don't have a cam with the complementing headers, just buy an Edelbrock. Unless you bust a tweak in your spare time the Holly will simply drive you nuts. Carter/edelbrock's once adjusted are trouble free for any motor that's not really souped up. (Edit) Saw the Holly box, grrrr areggg. Sorry for the rant...

@TheKeymaster316

5 ай бұрын

Once I tuned this Holley on this truck, it has been trouble-free and runs fantastic. ;)

@kurrackthebarbarian6502

5 ай бұрын

@TheKeymaster316 No shade man, hope you have more luck than myself and others I've seen.

Needs to speak up can't hear it

@TheKeymaster316

Жыл бұрын

Duly noted. 👌🏻

the car wash would have made a better video and cleaner job for only a few quarters.

@TheKeymaster316

3 жыл бұрын

Are you talking about cleaning it off before working on it? 🤔. Certainly couldn’t have hurt. Truck sat for about 7 years and I’m sure a lot of the seals and gaskets and such could use replacing.