SKU: 91872121463

B&M Adjustable Modulator - GM TH350/TH400 Automatic Transmissions - 20234

$46.76 $51.95
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Description

B&M Adjustable Modulator - GM TH350/TH400 Automatic Transmissions - 20234Overview: The B&M vacuum modulator is fully adjustable and allows you to fine tune your shift points and shift feel. This is done by turning the adjustment screw inside of the vacuum line connection for more or less diaphragm preload, thus raising or lowering part throttle shift points and line pressures. For GM TH350 and TH400 automatic transmissions. Features: Allows you to Tailor Shift Points New O ring Helps Stop Leaks Fully Adjustable B&M Quality

Overview:

The B&M® vacuum modulator is fully adjustable and allows you to fine-tune your shift points and shift feel. This is done by turning the adjustment screw inside of the vacuum line connection for more or less diaphragm preload, thus raising or lowering part throttle shift points and line pressures. For GM TH350 and TH400 automatic transmissions.

Features:

  • Allows you to Tailor Shift Points
  • New O-ring Helps Stop Leaks
  • Fully Adjustable
  • B&M Quality

Application:

Year Make Model Submodel Engine Size
1967 - 1970 Pontiac Executive
1965 - 1969 Pontiac Tempest
1965 - 1969 Buick Special
1967 - 1972 Buick Sportwagon
1965 - 1983 Cadillac Commercial Chassis
1970 - 1974 GMC G35/G3500 Van
1970 Pontiac Tempest Base
1967 - 1974 GMC C25/C2500 Suburban
1967 - 1974 GMC K25/K2500 Pickup
1968 - 1974 GMC K25/K2500 Suburban
1968 - 1974 GMC K35/K3500 Pickup
1971 - 1977 GMC Sprint
1965 - 1971 Oldsmobile 442
1965 Oldsmobile 98 Base
1966 - 1980 Oldsmobile 98
1971 - 1980 Oldsmobile Custom Cruiser
1967 Oldsmobile Cutlass Turnpike Cruiser
1968 - 1980 Oldsmobile Cutlass
1979 - 1990 GMC K1500
1975 - 1978 GMC K25
1966 - 1971 Chevrolet Chevelle
1965 - 1972 Chevrolet Chevelle Base
1972 Chevrolet Chevelle SS
1972 Chevrolet Chevelle Malibu
1966 - 1967 Chevrolet Chevy II Base
1967 Chevrolet Chevy II Nova SS
1967 - 1980 Chevrolet Corvette
1965 - 1980 Chevrolet El Camino
1969 - 1974 Chevrolet G10 Van
1969 - 1974 Chevrolet G20 Van
1970 - 1974 Chevrolet G30 Van
1963 - 1980 Chevrolet Impala
1966 - 1974 Chevrolet K10 Pickup
1967 - 1984 Chevrolet K10 Suburban
1975 - 1978 GMC K25 Suburban
1979 - 1986 GMC K2500 Suburban
1979 - 1990 GMC K2500
1977 - 1978 GMC K35
1979 - 1990 GMC K3500
1975 - 1978 GMC P15
1979 - 1980 GMC P1500
1975 - 1978 GMC P25
1979 - 1989 GMC P2500
1975 - 1978 GMC P35
1979 - 1990 GMC P3500
1987 GMC R1500
1990 GMC R1500 Suburban
1987 - 1989 GMC R2500
1987 - 1990 GMC R2500 Suburban
1987 - 1990 GMC R3500
1987 GMC V1500
1990 GMC V1500 Suburban
1966 - 1974 Chevrolet K20 Pickup
1967 - 1986 Chevrolet K20 Suburban
1975 - 1989 Chevrolet P20
1979 - 1990 GMC G2500
1975 - 1978 GMC G35
1969 - 1990 Chevrolet Blazer
1969 - 1972 Chevrolet Brookwood
1966 - 1974 Chevrolet C10 Pickup
1967 - 1984 Chevrolet C10 Suburban
1988 - 1990 Chevrolet K1500
1975 - 1986 Chevrolet K20
1988 - 1990 Chevrolet K2500
1977 - 1986 Chevrolet K30
1988 - 1990 Chevrolet K3500
1965 - 1981 Cadillac DeVille
1965 - 1979 Cadillac Eldorado
1965 - 1984 Cadillac Fleetwood
1963 - 1975 Chevrolet Bel Air
1963 - 1972 Chevrolet Biscayne
1967 - 1968 Oldsmobile Delmont 88
1968 - 1980 Oldsmobile Delta 88
1965 - 1966 Oldsmobile Dynamic 88
1965 - 1972 Oldsmobile F85
1966 Oldsmobile F85 Base
1966 Oldsmobile F85 Deluxe
1966 Oldsmobile Jetstar 88
1973 - 1979 Oldsmobile Omega
1965 - 1980 Oldsmobile Starfire
1968 - 1975 Oldsmobile Vista Cruiser
1965 - 1980 Pontiac Bonneville
1965 - 1967 Pontiac Catalina Base
1966 Pontiac Catalina 2+2
1966 - 1967 Pontiac Catalina Safari
1968 - 1980 Pontiac Catalina
1967 - 1968 Pontiac Firebird Base
1967 Pontiac Firebird HO
1967 - 1968 Pontiac Firebird Sprint
1967 - 1968 Pontiac Firebird 400
1968 Pontiac Firebird 350
1969 - 1981 Pontiac Firebird
1973 - 1980 Pontiac Grand Am
1965 - 1980 Pontiac Grand Prix
1975 - 1976 Chevrolet Laguna
1975 - 1980 Chevrolet Malibu
1970 - 1980 Chevrolet Monte Carlo
1975 - 1980 Chevrolet Monza
1969 - 1978 Chevrolet Nova
1975 - 1980 Chevrolet P10
1975 Pontiac Grand LeMans
1976 - 1980 Pontiac Grand LeMans Base
1977 - 1980 Pontiac Grand LeMans Safari
1975 - 1978 Pontiac Grand Safari
1971 - 1975 Pontiac Grandville
1965 - 1980 Pontiac LeMans
1976 - 1977 Pontiac LeMans Base
1976 - 1977 Pontiac LeMans Sport
1977 Pontiac LeMans Safari
1977 - 1979 Pontiac Phoenix
1976 - 1980 Pontiac Sunbird
1965 - 1978 Buick Riviera
1975 - 1980 Buick Skyhawk
1965 - 1979 Buick Skylark
1965 - 1976 Cadillac Calais
1981 Oldsmobile Cutlass LS
1976 - 1977 Oldsmobile Cutlass S
1977 Oldsmobile Cutlass 442
1977 Oldsmobile Cutlass Colonnade
1976 - 1977 Oldsmobile Cutlass Colonnade S
1975 - 1980 Oldsmobile Cutlass Salon
1976 Oldsmobile Cutlass Tiara
1978 - 1980 Oldsmobile Cutlass Calais
1980 Oldsmobile Cutlass Cruiser
1975 - 1980 Oldsmobile Cutlass Supreme
1978 Oldsmobile Toronado
1975 - 1977 Pontiac Astre
1968 - 1974 GMC C15/C1500 Pickup
1968 - 1974 GMC C15/C1500 Suburban
1967 - 1974 GMC C25/C2500 Pickup
1968 - 1974 GMC C35/C3500 Pickup
1969 - 1974 GMC G15/G1500 Van
1969 - 1974 GMC G25/G2500 Van
1970 - 1990 GMC Jimmy
1966 - 1974 GMC K15/K1500 Pickup
1971 - 1977 Pontiac Ventura
1973 - 1975 Buick Apollo
1971 - 1973 Buick Centurion
1973 - 1981 Buick Century
1965 - 1981 Buick Electra
1970 - 1981 Buick Estate Wagon
1965 - 1967 Buick Gran Sport
1970 - 1972 Buick GS
1967 - 1974 GMC K15/K1500 Suburban
1969 - 1974 Chevrolet P20 Van
1965 - 1967 Chevrolet P30 Series
1969 - 1974 Chevrolet P30 Van
1966 Chevrolet Suburban
1969 - 1972 Chevrolet Townsman
1971 - 1973 Chevrolet Vega Base
1974 - 1977 Chevrolet Vega
1975 - 1990 Chevrolet G10
1975 - 1990 Chevrolet G20
1975 - 1990 Chevrolet G30
1975 - 1986 Chevrolet K10
1987 GMC V2500
1987 - 1990 GMC V2500 Suburban
1987 - 1990 GMC V3500
1966 - 1980 Chevrolet Caprice
1988 - 1990 Chevrolet C1500
1975 - 1986 Chevrolet C20
1967 - 1986 Chevrolet C20 Suburban
1988 - 1990 Chevrolet C2500
1975 - 1986 Chevrolet C30
1988 - 1990 Chevrolet C3500
1969 - 1981 Chevrolet Camaro
1965 - 1981 Buick LeSabre
1973 - 1981 Buick Regal
1979 - 1990 GMC C2500
1975 - 1978 GMC C25 Suburban
1979 - 1986 GMC C2500 Suburban
1975 - 1978 GMC C35
1979 - 1990 GMC C3500
1978 - 1980 GMC Caballero
1975 - 1978 GMC G15
1979 - 1990 GMC G1500
1975 - 1978 GMC G25
1966 - 1974 Chevrolet C20 Pickup
1966 - 1974 Chevrolet C30 Pickup
1973 Chevrolet Camaro Base
1973 Chevrolet Camaro RS
1973 Chevrolet Camaro LT
1965 Chevrolet Chevelle Deluxe
1966 - 1973 Pontiac GTO
1965 - 1966 Pontiac Star Chief
1982 - 1983 Cadillac Fleetwood Base
1982 - 1983 Cadillac Fleetwood Formal
1987 - 1990 Cadillac Brougham
1976 - 1978 Cadillac Seville
1975 - 1986 Chevrolet K5 Blazer
1975 - 1986 Chevrolet C10
1979 - 1990 GMC G3500
1981 - 1985 GMC G3500 Rally
1981 - 1985 GMC G3500 Rally STX
1981 - 1985 GMC G3500 Vandura
1981 - 1985 GMC G3500 Magnavan
1981 - 1985 GMC G3500 Rally Camper Special
1981 - 1985 GMC G3500 Vandura Special
1975 - 1978 GMC K15
1975 - 1978 GMC K15 Suburban
1979 - 1984 GMC K1500 Suburban
1975 - 1990 Chevrolet P30
1987 Chevrolet R10
1990 Chevrolet R1500 Suburban
1987 - 1988 Chevrolet R20
1987 - 1988 Chevrolet R20 Suburban
1989 Chevrolet R2500
1989 - 1990 Chevrolet R2500 Suburban
1987 - 1988 Chevrolet R30
1989 - 1990 Chevrolet R3500
1987 Chevrolet V10
1990 Chevrolet V1500 Suburban
1987 Chevrolet V20
1987 - 1988 Chevrolet V20 Suburban
1989 - 1990 Chevrolet V2500 Suburban
1987 - 1988 Chevrolet V30
1989 - 1990 Chevrolet V3500
1975 - 1978 GMC C15
1979 - 1990 GMC C1500
1975 - 1978 GMC C15 Suburban
1979 - 1984 GMC C1500 Suburban
1975 - 1978 GMC C25
1968 - 1974 Buick LeSabre Base
1969 Buick Skylark Base
1965 - 1970 Buick Wildcat
1968 Buick Wildcat Base
1969 - 1974 Chevrolet K30 Pickup
1969 - 1970 Chevrolet Kingswood Base
1971 - 1972 Chevrolet Kingswood
1973 - 1974 Chevrolet Malibu Base
1965 - 1967 Chevrolet P10 Series
1965 - 1967 Chevrolet P20 Series

Specs:

Brand B&M
California Proposition 65 Chemical Name Cadmium and cadmium compounds
California Proposition 65 Required Yes
Emission Code 5
Finish Gold Iridited
Instructions Included Yes
Material Steel
Product Type Automatic Transmission Modulator Valve
Warning California Proposition 65
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 91872121463

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4.7 ★★★★★
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Product Reviews
J
Just Me
Pawtucket, US
★★★★★ 5
Room Divider That Gives Instant “This Is a Separate Space Now” Energy
Size: 3 Panel 12FT W
The Siebwin 3 Panel Folding Privacy Screen is surprisingly effective at changing the feel of a room without requiring construction, commitment, or somebody yelling about load bearing walls. The 12 foot width gives a substantial amount of coverage, making it useful for creating privacy, dividing open areas, blocking visual clutter, or setting up temporary sections within larger rooms. This saved us a ton of time and money in our new studio and enabled us to create a kitchen and office in one room. The wider feet make a huge difference because flimsy room dividers that collapse every time someone exhales too aggressively are deeply annoying. This one feels more stable and grounded once positioned. The folding design makes it easy to move around or adjust depending on the space, and it folds down relatively compactly when not in use. It is basically the introvert curtain wall of dreams. The material has a clean, neutral look that blends well into different room styles without screaming “temporary office cubicle panic.” It works well for apartments, studios, shared spaces, dressing areas, or simply hiding the mountain of chaos you swear you are going to organize tomorrow. Practical, portable, and refreshingly easy to use without turning setup into a three hour emotional event.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
S
Skeetre
Lexington, US
★★★★★ 4
It's 2 panels holding 1 big privacy screen. Can't use as 2 separate 4' panels, but works great.
Size: 2 Panel 8FT W
This 2 panel privacy screen works well. Assembly was very straight forward, with easily labeled tubes. My son and I had it together in about 10 minutes, which was probably 3 minutes of me telling him to quit playing around and hand me the parts. It feels very sturdy, not likely to fall over or anything. The material fits well, with the Velcro being very strong. Measurements are all very accurate, with all pieces attaching properly. We have a similar privacy screen at work that we have to try and stretch out because the top and bottom Velcro doesn't fit quite right... this model does not have any issues though. The material is thin and light weight, but solid black so that you can't see anything through or behind it. I definitely think it's a great deal for the money. What I think would have given it 5 stars though, is if you had 2 totally separate 4' panels instead of 2 panels with one big screen. It really wouldn't cost any extra to make it so that the screen was in 2 pieces and you could use it as 2 separate panels instead of having to use it as one big panel. It says 2 panel folding privacy screens, but it's really one big one that folds in the middle.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
A
Amazon Customer
Cuba, US
★★★★★ 5
Versatile Room Divider With Easy Assembly and Strong Coverage
Size: 3 Panel 12FT W
I picked up this Siebwin 3-panel folding room divider mainly for privacy and room separation, and overall it works very well. Assembly is very straightforward, and the divider can be set up, taken apart, and stored without much effort. The fabric quality feels good, and the frame construction is stronger and more stable than expected. The support tubes especially feel well built and help keep the divider standing securely. One feature I really liked is the flexibility of the design. The panels can be used together as a complete divider or separated depending on the setup and available space. That makes it much more versatile for different room layouts or temporary privacy needs. The coverage is also very good, and the size matches the manufacturer’s description accurately. The fabric blocks light and background visibility well enough to provide solid privacy without feeling overly heavy. The wider feet also help improve stability compared to thinner folding dividers. Another positive detail is that everything arrived complete with no missing parts or damaged pieces, which made assembly much easier and faster. Compared to cheaper privacy screens, this one feels more durable and easier to customize depending on the situation. In terms of value for the money, it feels like a very practical and worthwhile purchase considering the size, flexibility, and build quality. Overall, a versatile and well-built room divider with easy assembly, strong privacy coverage, stable construction, complete included parts, flexible panel configuration, and excellent everyday functionality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
F
Fred
Lexington, US
★★★★★ 5
Stable, flexible in deployment configuration, creates true privacy and looks great.
Size: 3 Panel 12FT W
This is the second room divider panel I have installed, and there are several features about this one that I like much better than my older one. The fact that there are no gaps and that the material is thicker means you get more privacy or more hiding power, if you wish. My older divider has vertical spaces between each of the panels and the panels are half as wide as the Siebwin panels, so there are many vertical spaces. The Siebwin divider really creates privacy. Another feature that I really appreciate is that the legs are wider and stand off from the floor. On my older one the legs are flat and they're rather awkward to adjust because they create more drag on the floor. The feet on the older one also loosen if you turn them counter clockwise, so adjustments of configuration that require the feet to be moved are more complex. The older divider also must be deployed in a zig-zag fashion because he feet are not as wide, but this new one can be deployed and stable in a straight, an "N" shape or an arc. They are both the same length, but because the older one must be use in a zig-zag deployment it doesn't reach to the length of the new one. The Siebwin divider definitely costs more at $103.48, but it sports several features and advantages over the other brand, so it does a better job and is worth the extra cost.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
C
Computer
Lexington, US
★★★★★ 4
Easy to assemble, does the job, material is shiny nylon and shows creases, minor defects, sloppy
Size: 3 Panel 12FT W, Size: 3 Panel 12FT W
The Siebwin room divider is a good idea, and for the price, it mostly delivers on the intended functionality. I ordered the 12 foot, 3-panel version mainly to hide an unfinished basement storage area that had become an eyesore. It works well for that purpose and gives the space a cleaner appearance without spending the kind of money that more decorative dividers or custom partitions cost. If you need something temporary, portable, or mainly functional, this is a viable option. There are a few limitations that became obvious during setup and use. The first thing I noticed was that the weld quality on some of the metal poles is fairly sloppy. Once the cover is installed, you do not really see it, but up close, it does not look especially refined or professional. The blackout material also is not a matte canvas style fabric as I expected. It has more of a shiny nylon appearance, and the creases are fairly visible. Being that it’s more of a nylon, I’d be hesitant to try steaming it to remove the creases. However, the creases do not matter if you are using it in a basement, dorm, or shared room, but for photography, video work, or a professional office setting, the appearance could be disappointing. The fabric is thick enough, though. It blocks visibility well enough, but strong light behind it still shows through to some extent, nothing deal-breaking. Also, my fabric appeared to be slightly defective. The hook and loop strip on one of the bottom sections was off-center and couldn't be totally attached because it was lined up with one of the legs. I originally hoped to use this as a video backdrop, but I will probably end up replacing the fabric with a proper green screen or canvas material while continuing to use the frame itself. For now, it does a good job of covering my basement junk. Assembly was actually easier than I expected and took roughly 15 to 20 minutes. The longer vertical poles are tethered together similarly to tent poles, which made setup straightforward and fairly intuitive. The shorter horizontal pieces slide and snap together to the top and bottom of the vertical assembly. After each section is assembled, the divider panels connect together with metal plates and two knurled screws (at the top and bottom), so no tools are really required. A few screws were difficult to start because paint had gotten into the threads, but once they caught, they tightened down normally. The feet install with similar knurled fasteners and help keep the divider reasonably stable. One thing to watch for during setup is the fabric orientation. There is one arrow indicator in the middle of the fabric to indicate up. However, if you need another indicator, the smaller hook and loop strip goes on the bottom while the longer strip goes on top. I realized mine was upside down right before finishing and had to redo it. I wasn't difficult to redo, despite the defect in mine. The overall design is practical and easy to move around. I do like that the panels can fold and bend into different shapes depending on the space. The widened feet help stability, although when trying to stretch the fabric tight, I noticed the poles sometimes wanted to overlap slightly at the joints. Tightening everything helped somewhat, but it still happened occasionally. The divider feels adequate for normal indoor use, though I would not expect premium durability or luxury-level fit and finish at this price point. The entire device can also be easily disabled and stored in a tote if you need it completely out of the way. It comes with assembly instructions, but even if you didn’t have them, it’s easy to build without them (save a mistake or two). In terms of value, I think the Siebwin divider mostly matches its price. Around $100 gets you a large freestanding partition with decent usability and easy assembly, but there are compromises in materials, appearance, and refinement. The defects are also off-putting, but hopefully you won't have them. Higher-end room dividers can easily cost two or three times more, so some of the tradeoffs are expected. I also noticed cheaper alternatives online, but based on the quality here, I suspect those would probably have even more issues. For practical home use, temporary privacy, hiding storage areas, or separating shared spaces, this is a good option as long as expectations stay realistic.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026

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