Excellent video very well explained. I have a 2008 BMW 750LI it jumps when i change the gear from park to reverse , Sometimes it will not go in to any gears at all . I had a lots of fluid changed it cost me more then thousand dollars on just the fluid changes . It still does not make any difference , The dealers do not service this car anymore. it is the vacuum line that is the problem but hard to locate there are to many lines coming from engine to transmission . the car has 1056000 km on it , new transmission is not required . Thanks for posting the repair video.
Bashirsz Darz you have it fixed by now i hope. I just I wanted to add my two cents by saying that the vacuum line doesn't affect the gear change from neutral to reverse, as far as I know. It just effects the quality/timming of the shift. Linkage or valvebody is my thought. :-)
Just changed mine this evening...1967 Ford Galaxie 500 convertible 390 2bbl with C6...there was no pin...but I had serious shifting problems before (shifted hard and at higher-than-normal RPM) but now it shifts very smoothly but at way low RPM...like 10MPH for 1->2 shift and around 20 to hit 3rd...
You need to adjust your pin. There are videos on how to do that. I'm having a similar problem. Mine's going into second at 15 MPH then into 3rd at 20 MPH
Thanks for the video. Is the function of the Vacuum Modulator Valve only to control gear changes? When I adjust the Vacuum Modulator Valve the Modulator Pressure changes and often drops to zero bar.
Hello, I have a 1971 Mercury Monterey with a 5.8l 351W engine and an FMX transmission. The transmission control module went bad and so I bought a new one. I’m worried about the little rod that goes into the new module because it is very loose inside the module and moves around when I try to install it. I am afraid that the rod will fall out into the transmission itself. It is also a threaded module. Do you happen to have any advice for properly installing the rod and making sure it stays in place?
Where does the vaccum line go to the manifold? Is it a hard line or rubber? My mustang having shifting problems. Have to rev up high to get it to shift.
I have a C6 transmission and I get up to about 55 miles an hour and it slips out of gear I have nothing and an engine just revs until I let it coast down to about 15 miles an hour and then it goes back into again. Could this be the problem
Excellent, simple and to the point, thank you. A question, could a bad Vac Modulator be the reason my '68 Torino can not excellerate of 30 MPH ? Thank you in advance.
did you ever get an answer on the Pin ? i think mine also is a custom made pin and would like the correct one , Also where does the vacuum line connect to on the motor ? im shifting fast into second gear and slipping into third .
Mine was missing as well.I went to my local transmission shop and asked them. He gave me 4 different sizes. He said you can tell the one that fits best has a little resistance, not too much but just a little. I started with the second to largest size but it was too small. Moved up to the biggest one and that fit just right. This is on a 1970 maverick c4 automatic transmission.
My 65 wont shift into 3rd either, have you had any luck fixing yours? Any advice? would be super helpful. Everything works fine just doesn’t go into third.
@@sawysauce1256that’s my problem as well same car I replaced the shift module and it won’t go into 3rd gear 1st and 2nd are smooth It looks like the trannys been out and rebuilt before I bought it so I’m a little worried But I need to know what direction to turn the the modular to modify the shifting
@@cboswell569 I just discovered my vacuum line from Mod was attached to the "timed spark fitting on the primary metering block" which is used for the vacuum advance. I have an MSD mechanical distributor and will plug Mod line into the manifold vacuum source, and plug the fitting on the primary metering block. This should help a lot.
@@rapson672 Make sure your linkage arms on the side of the trans are in the proper adjustement while your at it. Good Luck. Oh, those trans moduals go bad also, usually screw in and inexpensive. Different color stripes on them are codes for how they perform, like hard shift, soft shift etc etc. Green striped Mod is normal shifting if I remember correctly. Good Luck!!
Maybe this is why my automatic transmission has very delayed shifts now. I have to manually opt in second gear and then it wont go to third unless it goes up to 2000-2500 rpm
Fox McCloud 007 Exactly my issue. I have a 1970 Ford F100 that likes to shift around the time it sounds like it’s about to blow, and I think the original modulator on my truck isn’t adjustable (just poked around with a tiny flathead, as advised, and found nothing to adjust inside of it), but the new one will be in tomorrow, and we’ll see how the replacement does! So excited it could be this cheap and easy to fix. Been dealing with it for a couple of months...
I have a 79 Fairmont with c4 in it. Won't shift into drive . Shifts up from 1to 2 and when it goes from 2to drive neutral it goes. New modulator valve and has vacuum new fluid . Car has 40,000 miles
Excellent video very well explained. I have a 2008 BMW 750LI it jumps when i change the gear from park to reverse , Sometimes it will not go in to any gears at all . I had a lots of fluid changed it cost me more then thousand dollars on just the fluid changes . It still does not make any difference , The dealers do not service this car anymore. it is the vacuum line that is the problem but hard to locate there are to many lines coming from engine to transmission .
the car has 1056000 km on it , new transmission is not required . Thanks for posting the repair video.
Bashirsz Darz you have it fixed by now i hope. I just I wanted to add my two cents by saying that the vacuum line doesn't affect the gear change from neutral to reverse, as far as I know. It just effects the quality/timming of the shift. Linkage or valvebody is my thought. :-)
Just changed mine this evening...1967 Ford Galaxie 500 convertible 390 2bbl with C6...there was no pin...but I had serious shifting problems before (shifted hard and at higher-than-normal RPM) but now it shifts very smoothly but at way low RPM...like 10MPH for 1->2 shift and around 20 to hit 3rd...
You need to adjust your pin.
There are videos on how to do that.
I'm having a similar problem.
Mine's going into second at 15 MPH then into 3rd at 20 MPH
Thanks for posting! Great info and nice to know.
The throttle valve is part of the kick down circuitry. The modulator and valve control mainline pressure per the engine load. ;)
Thanks for the video. Is the function of the Vacuum Modulator Valve only to control gear changes? When I adjust the Vacuum Modulator Valve the Modulator Pressure changes and often drops to zero bar.
Hello, I have a 1971 Mercury Monterey with a 5.8l 351W engine and an FMX transmission. The transmission control module went bad and so I bought a new one. I’m worried about the little rod that goes into the new module because it is very loose inside the module and moves around when I try to install it. I am afraid that the rod will fall out into the transmission itself. It is also a threaded module. Do you happen to have any advice for properly installing the rod and making sure it stays in place?
Where does the vaccum line go to the manifold? Is it a hard line or rubber? My mustang having shifting problems. Have to rev up high to get it to shift.
I have a C6 transmission and I get up to about 55 miles an hour and it slips out of gear I have nothing and an engine just revs until I let it coast down to about 15 miles an hour and then it goes back into again. Could this be the problem
Would this modulator prevent a C4 transmission from going into gear whether it be into Drive from Park or into Reverse from Park?
Excellent video thanks for posting.
Life saver! Thanks
Excellent, simple and to the point, thank you. A question, could a bad Vac Modulator be the reason my '68 Torino can not excellerate of 30 MPH ? Thank you in advance.
Why the music that loud ?
The vacuum modulator "pin" is missing on my C4. Where can I buy one?
did you ever get an answer on the Pin ? i think mine also is a custom made pin and would like the correct one , Also where does the vacuum line connect to on the motor ? im shifting fast into second gear and slipping into third .
No, never got an answer.
The vacuum line is supposed to be connected to the manifold.
Don't know if you can buy just the pin but a new modulator is not that expensive.
Mine was missing as well.I went to my local transmission shop and asked them. He gave me 4 different sizes. He said you can tell the one that fits best has a little resistance, not too much but just a little. I started with the second to largest size but it was too small. Moved up to the biggest one and that fit just right. This is on a 1970 maverick c4 automatic transmission.
Does the pin plug into the modulator or does it just kinda float freely in there?
Its free
Same for a 93 mustang 4 cylinder?
Could you explain all the different stripe colors on the modulator valves? What color stripe would a 67 289 have?
White
Never got an answer on where to source a missing pin for the vacuum modulator on the C4??
transtar
Does a 94 Mustang have a modulatar valve?
Would this cause my ‘68 to stall when i put it in gear (C4) if it were bad?
She has been running great, and this just started last weekend.
Probably the torque converter
Could the adjustment cause it to rev between 2nd-3rd?
I just replaced my vacuum modulator and it revs from 2nd to 3rd. Did u get this fixed?
@@mando82jr no I just swapped back to a 5 speed.
Does a 94 Mustang have one of these?
Would this cause the car to die when put in gear? My 67 will set and idle all day. But as soon as I put it in gear, it dies.
Torque converter most likely
Seems I have to remove that cross brace just to get to mine. Is that the only thing holding my trans in place? 😬
You also have it bolted to the block via the bell housing.
Mine won't shift in to 3rd at all may clean mine up see if it makes any difference then get a new one if so
My 65 wont shift into 3rd either, have you had any luck fixing yours? Any advice? would be super helpful. Everything works fine just doesn’t go into third.
Same here, sometimes it will shift, but it’s a struggle. Did this vacuum valve fix?
@@sawysauce1256that’s my problem as well same car I replaced the shift module and it won’t go into 3rd gear 1st and 2nd are smooth
It looks like the trannys been out and rebuilt before I bought it so I’m a little worried
But I need to know what direction to turn the the modular to modify the shifting
valuable info.thanks.Looking where to buy one.Probably C.J.Auto.
my car stays in 1st gear when I'm on D(drive). it won't leave 1st gear. I've put it on 2 and 1 and still stays on 1st
1968 on_Machs same issue...ever figured out what it was
I got a 67 cougar with the c4
Just over revs on first
Wont go into 2nd or 3rd
check your vacuum line for leaks.
If that doesn't work you may need a new modulator.
@@cboswell569 I just discovered my vacuum line from Mod was attached to the "timed spark fitting on the primary metering block" which is used for the vacuum advance. I have an MSD mechanical distributor and will plug Mod line into the manifold vacuum source, and plug the fitting on the primary metering block. This should help a lot.
@@robertclymer6948 Thanks for your comment, I hope the intake source will fix my problem also ?
@@rapson672 Make sure your linkage arms on the side of the trans are in the proper adjustement while your at it. Good Luck. Oh, those trans moduals go bad also, usually screw in and inexpensive. Different color stripes on them are codes for how they perform, like hard shift, soft shift etc etc. Green striped Mod is normal shifting if I remember correctly. Good Luck!!
Maybe this is why my automatic transmission has very delayed shifts now. I have to manually opt in second gear and then it wont go to third unless it goes up to 2000-2500 rpm
Good possibility
Fox McCloud 007 Exactly my issue. I have a 1970 Ford F100 that likes to shift around the time it sounds like it’s about to blow, and I think the original modulator on my truck isn’t adjustable (just poked around with a tiny flathead, as advised, and found nothing to adjust inside of it), but the new one will be in tomorrow, and we’ll see how the replacement does! So excited it could be this cheap and easy to fix. Been dealing with it for a couple of months...
I have a 79 Fairmont with c4 in it. Won't shift into drive . Shifts up from 1to 2 and when it goes from 2to drive neutral it goes. New modulator valve and has vacuum new fluid . Car has 40,000 miles
I want this song..
Those power chords tho..
hate the fake rock music....
Music sucks
Which way do you turn to firm up the shifts?