Install: B&M Vacuum Modulator for GM TH350 & TH400 Automatic Transmissions 20234. Please subscribe to our YouTube channel: https://www.youtube.com/user/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: https://www.holley.com/brands/b_and_m/
B&M Vacuum Modulator for GM TH350/TH400 Automatics – Part # 20234: https://www.holley.com/products/drivetrain/shift_improver_and_rebuild_kits/parts/20234
B&M shifters, transmissions, oil coolers, trans pans, diff covers, etc.: https://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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What happened if the transmission vacuum not working
Looking to see where the modulata is locate on a 1961Lincòn
THANK YOU SO MUCH. THAT IS STRAIGHTFORWARD AND SIMPLE. GREAT VIDEO AND THANKS FOR SHARING. I LEARNED SO MUCH.
i though th350s had a kickdown cable. can this be used as a replacement to a kickdown cable?
anyone tell me how long is the steel tub goin from the modulator to the top of the motor thank you for the help
Holy crap that’s so easy!
Does this have a familiar outcome as a shift kit or am I not understanding what it does exactly?
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.
Where do you plug the vacuum modulator into (The rubber hose)
My corvette 1978 automatic shifts hard from 1st to 2nd. Would this part help, since it is adjustable?
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
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.
Great information solved my problem
Well what direction you turn set screw to shift faster or softer?
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
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?
Which way do you turn the screw for later shifts? Mine shifts way too early.
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.
5 Stars !!!!!! Thank you !!!!!! John