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Description
B&M Shift Improver Kit - GM TH400 Transmissions - 20260Overview: The B&M Shift Improver kits feature two options to recalibrating your 1965 1987 GM TH400, TH375 and TH475 automatic transmissions. First is the HEAVY DUTY set up, giving you firm positive shifts without loss of driver comfort for improved performance in all street vehicles. This is a great option for performance street driving or towing. The second is our STREET STRIP set up. Be warned, this will deliver firm positive shifts you will feel,
Overview:
The B&M® Shift Improver kits™ feature two options to recalibrating your 1965-1987 GM TH400, TH375 and TH475 automatic transmissions. First is the HEAVY DUTY set-up, giving you firm positive shifts without loss of driver comfort for improved performance in all street vehicles. This is a great option for performance street driving or towing. The second is our STREET/STRIP set-up. Be warned, this will deliver firm positive shifts you will feel, along with easily chirping the tires when shifting somewhat aggressively. This setting is recommend for high performance street/strip use, or for competitive events when you want the hardest, quickest shifts possible from a shift improver kit.
Features:
- Perfect for Towing or Street/Strip Use
- Eliminates Soft and Sluggish Shift
- Recalibrates Stock Transmissions
- Over 65 Years of B&M Quality
- Eliminates Shift Overlap
- Provides Crisp Shifts
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| 1965 - 1971 | Oldsmobile | 442 | ||
| 1965 | Oldsmobile | 98 | Base | |
| 1966 - 1980 | Oldsmobile | 98 | ||
| 1975 - 1986 | Chevrolet | K20 | ||
| 1967 - 1986 | Chevrolet | K20 Suburban | ||
| 1963 - 1972 | Chevrolet | Biscayne | ||
| 1969 - 1987 | Chevrolet | Blazer | ||
| 1968 - 1974 | GMC | C35/C3500 Pickup | ||
| 1969 - 1974 | GMC | G15/G1500 Van | ||
| 1969 - 1974 | GMC | G25/G2500 Van | ||
| 1970 - 1974 | GMC | G35/G3500 Van | ||
| 1970 - 1987 | GMC | Jimmy | ||
| 1966 - 1974 | GMC | K15/K1500 Pickup | ||
| 1967 - 1974 | GMC | K15/K1500 Suburban | ||
| 1975 - 1978 | GMC | K25 | ||
| 1979 - 1986 | GMC | K2500 | ||
| 1975 - 1978 | GMC | K25 Suburban | ||
| 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 - 1974 | Oldsmobile | Omega | ||
| 1975 - 1982 | Checker | Marathon | ||
| 1976 - 1977 | Pontiac | Grand LeMans | Base | |
| 1977 | Pontiac | Grand LeMans | Safari | |
| 1965 - 1977 | Pontiac | Grand Prix | ||
| 1975 - 1976 | Pontiac | Grand Safari | ||
| 1971 - 1975 | Pontiac | Grandville | ||
| 1965 - 1975 | Pontiac | LeMans | ||
| 1976 - 1977 | Pontiac | LeMans | Base | |
| 1976 - 1977 | Pontiac | LeMans | Sport | |
| 1977 | Pontiac | LeMans | Safari | |
| 1971 - 1980 | Oldsmobile | Custom Cruiser | ||
| 1973 | Buick | Apollo | ||
| 1971 - 1973 | Buick | Centurion | ||
| 1973 - 1977 | Buick | Century | ||
| 1964 - 1981 | Buick | Electra | ||
| 1965 - 1981 | Buick | LeSabre | ||
| 1970 - 1981 | Buick | Estate Wagon | ||
| 1973 - 1977 | Buick | Regal | ||
| 1965 - 1978 | Buick | Riviera | ||
| 1979 - 1986 | GMC | K2500 Suburban | ||
| 1977 - 1978 | GMC | K35 | ||
| 1979 - 1986 | GMC | K3500 | ||
| 1976 - 1978 | GMC | P15 | ||
| 1979 - 1980 | GMC | P1500 | ||
| 1975 - 1978 | GMC | P25 | ||
| 1979 - 1987 | GMC | P2500 | ||
| 1975 - 1978 | GMC | P35 | ||
| 1979 - 1987 | GMC | P3500 | ||
| 1987 | GMC | R1500 | ||
| 1987 | GMC | R2500 | ||
| 1987 | GMC | R2500 Suburban | ||
| 1987 | GMC | R3500 | ||
| 1971 - 1975 | GMC | Sprint | ||
| 1987 | GMC | V1500 | ||
| 1987 | GMC | V2500 | ||
| 1987 | GMC | V2500 Suburban | ||
| 1987 | GMC | V3500 | ||
| 1968 - 1975 | Oldsmobile | Cutlass | ||
| 1975 | Oldsmobile | Cutlass Salon | ||
| 1975 | Oldsmobile | Cutlass Supreme | ||
| 1978 | Oldsmobile | Toronado | ||
| 1968 - 1974 | GMC | C15/C1500 Suburban | ||
| 1967 - 1974 | GMC | C25/C2500 Pickup | ||
| 1967 - 1974 | GMC | C25/C2500 Suburban | ||
| 1969 - 1972 | Chevrolet | Brookwood | ||
| 1966 - 1974 | Chevrolet | C10 Pickup | ||
| 1967 - 1984 | Chevrolet | C10 Suburban | ||
| 1966 - 1974 | Chevrolet | C20 Pickup | ||
| 1967 - 1986 | Chevrolet | C20 Suburban | ||
| 1966 - 1974 | Chevrolet | C30 Pickup | ||
| 1967 - 1975 | Chevrolet | Camaro | ||
| 1973 | Chevrolet | Camaro | Base | |
| 1973 | Chevrolet | Camaro | RS | |
| 1973 | Chevrolet | Camaro | LT | |
| 1966 - 1975 | Chevrolet | Caprice | ||
| 1965 - 1972 | Chevrolet | Chevelle | Base | |
| 1965 | Chevrolet | Chevelle | Deluxe | |
| 1966 - 1971 | Chevrolet | Chevelle | ||
| 1966 - 1967 | Pontiac | Catalina | Safari | |
| 1968 - 1977 | 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 - 1977 | Pontiac | Firebird | ||
| 1973 - 1975 | Pontiac | Grand Am | ||
| 1979 - 1986 | GMC | K1500 | ||
| 1977 - 1978 | GMC | K15 Suburban | ||
| 1979 - 1984 | GMC | K1500 Suburban | ||
| 1969 - 1974 | Chevrolet | K30 Pickup | ||
| 1969 | Chevrolet | Kingswood | Base | |
| 1972 | Chevrolet | Kingswood | ||
| 1973 - 1974 | Chevrolet | Malibu | Base | |
| 1970 - 1975 | Chevrolet | Monte Carlo | ||
| 1965 - 1967 | Buick | Gran Sport | ||
| 1970 - 1972 | Buick | GS | ||
| 1968 - 1974 | Buick | LeSabre | Base | |
| 1967 - 1974 | GMC | K25/K2500 Pickup | ||
| 1967 - 1974 | GMC | K25/K2500 Suburban | ||
| 1968 - 1974 | GMC | K35/K3500 Pickup | ||
| 1969 - 1974 | GMC | P15/P1500 Van | ||
| 1969 - 1974 | GMC | P25/P2500 Van | ||
| 1969 - 1973 | GMC | P35/P3500 Van | ||
| 1974 | GMC | P35/P3500 Van | Base | |
| 1969 - 1975 | Chevrolet | Nova | ||
| 1976 - 1980 | Chevrolet | P10 | ||
| 1975 - 1987 | Chevrolet | P20 | ||
| 1975 - 1987 | Chevrolet | P30 | ||
| 1987 | Chevrolet | R10 | ||
| 1987 | Chevrolet | R20 | ||
| 1987 | Chevrolet | R20 Suburban | ||
| 1987 | Chevrolet | R30 | ||
| 1987 | Chevrolet | V10 | ||
| 1987 | Chevrolet | V20 | ||
| 1987 | Chevrolet | V20 Suburban | ||
| 1987 | Chevrolet | V30 | ||
| 1975 - 1978 | GMC | C15 | ||
| 1979 - 1986 | GMC | C1500 | ||
| 1975 - 1978 | GMC | C15 Suburban | ||
| 1979 - 1984 | GMC | C1500 Suburban | ||
| 1975 - 1978 | GMC | C25 | ||
| 1979 - 1986 | GMC | C2500 | ||
| 1975 - 1978 | GMC | C25 Suburban | ||
| 1979 - 1986 | GMC | C2500 Suburban | ||
| 1966 - 1967 | Chevrolet | Chevy II | Base | |
| 1967 | Chevrolet | Chevy II | Nova SS | |
| 1967 - 1977 | Chevrolet | Corvette | ||
| 1965 - 1975 | Chevrolet | El Camino | ||
| 1969 - 1974 | Chevrolet | G10 Van | ||
| 1969 - 1974 | Chevrolet | G20 Van | ||
| 1966 - 1973 | Pontiac | GTO | ||
| 1965 - 1966 | Pontiac | Star Chief | ||
| 1971 - 1974 | Pontiac | Ventura | ||
| 1970 - 1974 | Chevrolet | G30 Van | ||
| 1965 - 1967 | Buick | Special | ||
| 1965 - 1976 | Cadillac | Calais | ||
| 1965 - 1981 | Cadillac | DeVille | ||
| 1965 - 1979 | Cadillac | Eldorado | ||
| 1965 - 1984 | Cadillac | Fleetwood | ||
| 1974 - 1983 | Cadillac | Fleetwood | Base | |
| 1974 | Cadillac | Fleetwood | 75 | |
| 1974 | Cadillac | Fleetwood | 60 Special | |
| 1963 - 1975 | Chevrolet | Bel Air | ||
| 1967 | Oldsmobile | Cutlass | Turnpike Cruiser | |
| 1967 - 1968 | Oldsmobile | Delmont 88 | ||
| 1977 - 1986 | Chevrolet | K30 | ||
| 1975 - 1986 | Chevrolet | C20 | ||
| 1975 - 1986 | Chevrolet | C30 | ||
| 1977 - 1987 | Chevrolet | G10 | ||
| 1975 - 1987 | Chevrolet | G20 | ||
| 1975 - 1987 | Chevrolet | G30 | ||
| 1963 - 1975 | Chevrolet | Impala | ||
| 1977 - 1986 | Chevrolet | K10 | ||
| 1983 | Chevrolet | K10 | Custom | |
| 1983 | Chevrolet | K10 | Scottsdale | |
| 1983 | Chevrolet | K10 | Silverado | |
| 1967 - 1984 | Chevrolet | K10 Suburban | ||
| 1978 | Buick | Skyhawk | ||
| 1965 - 1983 | Cadillac | Commercial Chassis | ||
| 1976 - 1978 | Cadillac | Eldorado | Base | |
| 1976 - 1978 | Cadillac | Eldorado | Cabriolet | |
| 1976 - 1978 | Cadillac | Eldorado | Biarritz | |
| 1976 | Cadillac | Eldorado | Bicentenial Edition | |
| 1980 - 1981 | Cadillac | Fleetwood | Brougham | |
| 1980 - 1981 | Cadillac | Fleetwood | Brougham d'Elegance | |
| 1980 - 1983 | Cadillac | Fleetwood | Formal | |
| 1987 | Cadillac | Brougham | ||
| 1976 - 1978 | Cadillac | Seville | ||
| 1977 - 1986 | Chevrolet | K5 Blazer | ||
| 1975 - 1986 | Chevrolet | C10 | ||
| 1965 - 1972 | Buick | Skylark | ||
| 1969 | Buick | Skylark | Base | |
| 1965 - 1970 | Buick | Wildcat | ||
| 1968 | Buick | Wildcat | Base | |
| 1975 - 1978 | GMC | C35 | ||
| 1979 - 1986 | GMC | C3500 | ||
| 1977 - 1978 | GMC | G15 | ||
| 1979 - 1987 | GMC | G1500 | ||
| 1975 - 1978 | GMC | G25 | ||
| 1979 - 1987 | GMC | G2500 | ||
| 1975 - 1978 | GMC | G35 | ||
| 1979 - 1986 | GMC | G3500 | ||
| 1981 - 1987 | GMC | G3500 | Rally | |
| 1981 - 1987 | GMC | G3500 | Rally STX | |
| 1981 - 1987 | GMC | G3500 | Vandura | |
| 1981 - 1987 | GMC | G3500 | Magnavan | |
| 1981 - 1987 | GMC | G3500 | Rally Camper Special | |
| 1981 - 1987 | GMC | G3500 | Vandura Special | |
| 1987 | GMC | G3500 | Rally Custom | |
| 1977 - 1978 | GMC | K15 | ||
| 1966 - 1974 | Chevrolet | K10 Pickup | ||
| 1966 - 1974 | Chevrolet | K20 Pickup | ||
| 1965 - 1969 | Pontiac | Tempest | ||
| 1966 - 1972 | Buick | Sportwagon | ||
| 1966 - 1968 | Pontiac | Tempest | Custom | |
| 1967 - 1970 | Pontiac | Executive | ||
| 1968 - 1970 | Pontiac | Tempest | Base | |
| 1968 | Pontiac | Tempest | Safari | |
| 1965 - 1966 | Oldsmobile | Starfire | ||
| 1968 - 1975 | Oldsmobile | Vista Cruiser | ||
| 1965 - 1977 | Pontiac | Bonneville | ||
| 1965 - 1967 | Pontiac | Catalina | Base | |
| 1966 | Pontiac | Catalina | 2+2 | |
| 1975 | Chevrolet | Laguna | ||
| 1975 | Chevrolet | Malibu | ||
| 1965 - 1967 | Chevrolet | P10 Series | ||
| 1969 - 1974 | Chevrolet | P10 Van | ||
| 1965 - 1967 | Chevrolet | P20 Series | ||
| 1969 - 1974 | Chevrolet | P20 Van | ||
| 1965 - 1967 | Chevrolet | P30 Series | ||
| 1969 - 1974 | Chevrolet | P30 Van | ||
| 1966 | Chevrolet | Suburban | ||
| 1969 - 1972 | Chevrolet | Townsman | ||
| 1974 | Chevrolet | Vega | ||
| 1968 - 1974 | GMC | C15/C1500 Pickup | ||
| 1975 | Buick | Century | Base | |
| 1975 | Buick | Century | Custom | |
| 1975 | Buick | Century | Luxus | |
| 1975 | Pontiac | Firebird | Trans Am | |
| 1975 | Pontiac | Grand LeMans |
Specs:
| Automotive Item Grade | High Performance |
|---|---|
| Brand | B&M |
| California Proposition 65 Chemical Name | Cadmium and cadmium compounds |
| California Proposition 65 Required | Yes |
| Emission Code | 5 |
| Gasket Included | Yes |
| Instructions Included | Yes |
| Manual Control | No |
| Product Type | Automatic Transmission Valve Body Kit |
| 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:
- 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
4.7 ★★★★★
Based on 5 reviews
Sort
Product Reviews
★★★★★ 5
Love it!
Style: Sonic Toothbrush with 2 Heads
Absolutely love! My daughter loves brushing her teeth now. Makes a huge difference and seems to actually clean the teeth.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 7, 2025
★★★★★ 5
Great Clean Alternative to Traditional Mouthwash, LOVE this!!
Flavor Name: Mint, Size: 3.5 Ounce (Pack of 1)
I’ve been really impressed with these Boka mouthwash tablets. They’re fluoride‑free and alcohol‑free, which is exactly what I was looking for, and the hydroxyapatite is a nice bonus for supporting enamel without the harshness of traditional mouthwashes. The tablets dissolve easily, the flavor is refreshing without being overpowering, and there’s no burning sensation at all. Do NOT chew and swallow like I did the first time. Chew, get salva going and swish. My teeth never felt so clean!!!
I also love that they’re travel‑friendly and cut down on plastic waste compared to big bottles. My breath feels fresh, and my mouth feels clean without that chemical aftertaste. If you’re trying to switch to a cleaner, gentler oral‑care routine, these are a great option.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 25, 2026
★★★★★ 5
Tasty, effective, and helpful against thrush
Flavor Name: Citrus Mint, Size: 3.5 Ounce (Pack of 1)
This is a good plastic-free, portable form of mouthwash. Pop one or two tablets in your mouth, chew well, add a little water if your mouth is particularly dry (mine is), swish, and spit. That's it. They don't burn like regular mouthwash, and they leave a nice flavor that isn't overpowering and that lasts longer than other mouthwashes have for me. It's a balanced flavor, if that means anything to you - basically, my mouth somehow feels right afterwards.
I was skeptical about the claim that these improve the mouth microbiome, but they've virtually eliminated the thick white layer (presumably thrush) that I've been fighting to clear off my tongue forever. So, yeah, these are definitely a winner.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 24, 2025
★★★★★ 4
More like a mint candy than mouthwash.
Flavor Name: Mint, Size: 3.5 Ounce (Pack of 1)
Hard to describe this product. Does it work like your typical mouthwash? No. Does it leave your mouth feeling minty and fresh? Yes, to a certain extent. Would I consider this an alternative to mouthwash on a consistent basis? No, it's ok for traveling because it's easy to transport.
When you chew this tablet, it has the texture and feel of a traditional mint. It's chalky and breaks up easily.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2026
★★★★★ 5
Great Product
Flavor Name: Citrus Mint, Size: 3.5 Ounce (Pack of 1)
I absolutely love this product! It keeps my breath fresh and no sensitivity issues.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
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