Install: B&M Vacuum Modulator for GM TH350 & TH400 Automatic Transmissions 20234
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- čas přidán 22. 07. 2024
- Install: B&M Vacuum Modulator for GM TH350 & TH400 Automatic Transmissions 20234. Please subscribe to our CZcams channel: / bmracingproducts
Questions? Need a product recommendation for your vehicle? Give us a call (866) 464-6553. B&M shifters, transmissions, torque converters, trans pans, diff covers, etc: www.holley.com/brands/b_and_m/
B&M Vacuum Modulator for GM TH350/TH400 Automatics - Part # 20234: www.holley.com/products/drive...
B&M shifters, transmissions, oil coolers, trans pans, diff covers, etc.: goo.gl/jaNSzF
B&M Part #20234 - Fits GM TH350 and TH400 automatic transmissions.
B&M's vacuum modulator is fully adjustable and allows you to tailor your shift points to within a range of 2-4 mph. This unit comes pre-adjusted for normal shift points and works with #TH350 and #TH400 automatic transmissions.
-Allows you to tailor shift points
-B&M Quality
-Comes pre-adjusted
-Fully adjustable
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Best fuckin video out there !! My truck was switching from its final gear to the one just before it n i have symptoms of a vacuum leak so bought a new modulator/govenor .. This video is 100% thank you ! 😁 Ima install it tonight it'll be a breeze now .
THANK YOU SO MUCH. THAT IS STRAIGHTFORWARD AND SIMPLE. GREAT VIDEO AND THANKS FOR SHARING. I LEARNED SO MUCH.
5 Stars !!!!!! Thank you !!!!!! John
Great information solved my problem
Holy crap that’s so easy!
I can't thank you enough bud.
I've spent two days on this subject looking everywhere on the interweb for somebody who had the exact information that you have. Of course I'm not going to go to any of the other sites because it's always in the last place you look ...isn't it. You ever find yourself in Medford Oregon shoot me a jingle, cuz I owe you a cup of coffee, and two frustrating days of my life I'll never get back.
Thanx again.
Keep your powder dry!
Elmer
⁶u u hy
Yeah so my 85 Cutlass wouldn't shift out of first gear , so i couldn't figure out what was going on. A few weeks passed , and i went under my car and felt for this vaccum modulator and felt with my hand that a hose was missing for it, felt around a little more and found a loose hose , stuck that sucker back on , took a test drive and that sucker was shifting like a charm ...
jona tavuki literally same thing happened to me on my k5
Had you been to a "service" station before hand?
@@MR..181 no I did not
79 el camino.. just took it for a drive around the neighborhood and it wouldnt shift out of first gear. Looked under the car and there was no hose connected at all.. Hopefully once I hook buy one thatll fix my problem
@@yaboidougie1904 i hope so too 👍
Will a bad modulator affect transmission not going into reverse?
I inadvertently poured
2 qts of Dextron 4 synthetic transmission fluid, my jeep calls for only type F fluid.
Now will not engage into reverse, shifts into drive easily., I've drained 4 qts X 2 twice
Still no change, fluid looks 👌 like new, and level is spot on! Do I need to rebuild ?
HELP!!
Im trying to get this old 305 running, the car lacks in power and is hesitant to drive but does drive and has abit of a hard shift, ive upgrades the intake, carb, open headers, and distributor. Is the vacuum modulator the reason for my trans problems, it starts fine, idles but doesnt drop rpm when i put it into drive like it should. If anyone sees this any help is appreciated
anyone tell me how long is the steel tub goin from the modulator to the top of the motor thank you for the help
Looking to see where the modulata is locate on a 1961Lincòn
8 months after installing my hose it cracked where it fits over the flare in the hard-line. The hose has never come out of the garage (ha!), and I softened it up some with heat so it slipped right on. Perhaps it's just junk, but it came with the modulator from a reputable shop who built my transmission.
i noticed no trans fluid coming out when you removed the modulator. mine leaks alot of fluid when i remove the modulator(which i cant stop from leaking even with a new o ring.
thats because the tranny aint got any oil in it, notice he doesnt have a pan on it haha
When you remove the old modulator, is there a spring or plunger that might pop out?
Nothing but the modulator should come out. If the o ring does not come out attached to modulator ensure you dig it out of the housing area as the video explained.
Make sure you get the old o-ring out. There's also a pin, but don't lose that.
Where do you plug the vacuum modulator into (The rubber hose)
Manifold vacuum.
Is there lots off atf oil comming out with pan on it?
When upgrading your current vacuum modulator to the B&M Racing GM Vacuum Modulator you can expect to have some ATF spillage during replacement if the transmission pan is on and transmission is at the correct level. Prior to removing the old modulator, you can place a cup, bowl, etc. below to catch the residual fluid. You can then use the container as your "measuring cup" to calculate how much ATF was lost and use that as your guide on how much ATF you'll need to top off the transmission.
- Jason @ B&M Racing
I had change two these.A quart transmission fluid pours out when I take it off.400turbo anyone know why
Tim Etherton because it’s to high.
Let it drain down till it stops.
Then your set.
My vacuum line keeps popping out of the modulator under high boost. 16psi. How can I keep it from popping out?
Hose clamp
Make sure you have a new hose and of the correct size and then use a zip-tie between the body of the modulator and the nub on the stem to hold it on.
Which way do you turn the screw for later shifts? Mine shifts way too early.
Clockwise makes it shift a little later (up to about 4 miles per hour).
Hi will this make my shifts. Faster I mean I want to be in third at a slower speed
@@brookewoody8620 Turn the adjusting screw counter-clockwise for earlier shifting at part throttle. I don't know how much total adjustment is available, so I wouldn't go further than a half-turn at a time, then go for a test drive. This is not supposed to make huge changes.
@@brookewoody8620 i know it an old post but the answer is no. for this you would have to look into adjusting the governor located on the left side of the th 400
Well what direction you turn set screw to shift faster or softer?
Go out and turn it. See what happens you,lazy bum, if it’s not better, go the other way
It's not about harshness, but when it shifts. Turn it clockwise for a later shift.
@@jonellwanger7258 RELAX fuk Stick
My corvette 1978 automatic shifts hard from 1st to 2nd. Would this part help, since it is adjustable?
No. It only adjusts at what rpm. It shifts. Not how hard.. it only seems harder cause your cropping the car into gear at higher rpm.
@@jonellwanger7258 how do you know what rpm its set at? Is there a certain formula? Example: a certain amounts of turns on the governor vs rpm change?
@@johnnyturbo8460 you drive it. So you’ll make a change in the driveway, (one full turn) go drive it, and see if there is a difference. (No change , give it another turn) but There isn’t a chart that shows how many turns will equal the “shift rpm” so, its a tuning game, like a carb change. You wont know until you drive it.
@@jonellwanger7258 ok no problem, That's all I need to know. thanks! 😁👍
Does this have a familiar outcome as a shift kit or am I not understanding what it does exactly?
Similar. The Shift kit shifts a lot more solid and harder than the modulator set screw. With a shift kit th350 trans, I was chirping tires hard throttle into 2nd gear. WITH a terrible 2.73 rear. I don’t think the highest setting modulator is doing that. Although it will make it shift quicker.
@@tapa2466 thanks.. yeah I recently put B&Ms th350 shift kit in my c10.. its got a 3.08 rear gear and at full throttle it too will chirp the tires 😁👍
i though th350s had a kickdown cable. can this be used as a replacement to a kickdown cable?
You don’t need a kickdown cable for a th350 like you do a 700r4. You can run one but it isn’t necessary. Vacuum has nothing to do with the kickdown.
@@C8corvetteobsession901 You have no clue at all on what you're talking about. 700R4 uses a throttle valve and does not have a kickdown cable. A 350 uses vacuum and has everything to do with the kickdown cable. Bozo....
My TH350 goes into gear when I first start it but then it loses it. I can put it in any gear and it won't engage. When I shut the car off and restart it it will go into gear again. Would this have anything to do with a bad modulator? Just started doing this suddenly, went on a 100 mile trip the day before and it ran fine.
Double check fluid level. Make sure the shift arm isn't slipping on the transmission side, and possibly the trans filter not installed properly. About the only things I can think of.
Your govenor might have gone bad , that's also easy to replace
im having a similar issue. What was the solution?
Change the filter & fluid!! If you have a stopped up filter it will stop pulling completely as soon as the transmission warms up!! It's also the cheapest easiest thing to try first, but I've seen a dirty tranny filter cause that issue of not pulling many of times in my 46 years!
Wait, you guys are in Humboldt?
No, just a bit south. Our Corporate offices are in Santa Rosa and Production comes out of Sacramento.
- Jason @ B&M Racing
why don't u show when the atf or trans oil comes gushing out.
Because he had taken the oil pan off so there wasn't any fluid in it other than what's left in the valve body cavity's and the torque converter !
Mine didnt do that, maybe yours was over filled
does anybody know how to properly put the bushing & grommet on a shifter rod with the washers for a p30 chevy 1985 4.8 step van been looking for over 2 weeks can't find how the bushing & little plastic grommet & washer go .does the washer go on top or bottom or is there 2 washers 1 for the bottom & 1 for the top not sure can't find schematics for it anywhere im in need of some real help ....please anybody send me a pic on how ti looks
Try contacting www.classicstepvans.com/. They may be able to help you out.
- Jason @ B&M Racing
Where is it located? That's all I need to know.
In most applications the vacuum modulator can be found on the passenger side of the transmission, near the inlets and outlets of your transmission fluid hard lines.
@@BMRacingPerformance where does it connect to?
@@champking20 intake manifold vacuum port
@@champking20 connect it to the gas tank.
We're the vacuum line going under the hood ????
Usually its behind the carburetor on the intake, its like dead center beteeen the distributor and carb on my edelbrock rpm intake
@@x._.s.m any way you can get a pic of exactly where
@@champking20 i don't have the sbc anymore. I went with an ls1 friend. I can prob google a pic and find the line and send it to you
@@champking20 do you have an ig or way i can send the pics. On the app it doesn't let me send messages
Goes into the radiator.
The only point he did not say is which way to turn for hard or soft shifting ... we are all here to learn that.. Can anyone tell?
Did u ever figire out which way it was? LOL i just rebuilt.my transmission have the new modulator on but shifts are lagging needs to shift just a tad sooner and google says clockwose faster counter clockwise slower i tried 1/4 turn clockwise amd it didnt change anything much if it did it made it lag longer... so i am trying figure this out
@@keenaconner2108 qzeevvt
@@keenaconner2108
Ec b CRT
Left is softer right is harder
@@keenaconner2108 It does not change shift points, it changes firmness.