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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
4.1 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 5
such a good read
Format: Kindle
Madison, Lucas, Grey and Rian were made for each other!!! First time reading from this author and I’m not disappointed!!! Absolutely love the Love in this book and couldn’t ask for a better OV!
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Reviewed in the United States on October 25, 2023
★★★★★ 4
Fluffy and Nice Omegaverse
Format: Kindle
… this would have made 5 stars but for 2 reasons.
A.) there were quite a few typos; misspelled words, missing quotations, “the his” mistakes, and various signs that maybe a proofread would do good.
B.) the writing was quite textbook. Late blooming omega is struggling with her new self, finds a absurdly wealthy pack of alphas, every thing is almost insta-love but she resists, then decides to love herself and let everyone be happy.
Rian was my favourite (obviously the author’s favourite too because he got the most page time) but I wish we could see more of his CEO side? He went to work maybe ONCE the entire time. Gray was supposed to be the “growly one” but he turned out to be puppy dog. Lucas was a genius brainiac doctor - but also super alpha with an aggressive hindbrain with a breeding k*nk?? And then there was no actual “breeding”??
Spice 3/5 - normally omegaverse books are super high on messy smut but this was tamer.
Romance 3/5 - insta-love that was then resisted because of personal hangup’s
Plot 2/5 - weird paced head hopping, showing the same scene from different POV’s that made me feel like it was 2 steps backward, 1 step forward.
Humour 4/5 - there were a dozen lines that genuinely made me chuckle out loud
Would have been five stars but the lack of proofreading and the predictable plot made me unable to get up to ADORED IT level - four stars is still and official ENJOYED IT, y’all. This isn’t a bad rating. The “Club Heat” has intriguing possibilities so I’m going to give the second one a shot.
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Reviewed in the United States on March 31, 2023
★★★★★ 5
ABSOLUTELY A MUST for Omegaverse Girls!!!
I ABSOLUTELY LOVE Jillian West and her books!!! I’m so happy I already bought book two and now I have to buy the others for the Assurance Security series!!
Not gonna lie Val kind of annoyed me at the beginning but she grew on me!! Her men are chef’s kisses!!! Holt annoys me some but I can let it slide. I already bought part two so I’m going to be reading that in between work phone calls!!!! DON’T TELL MY BOSS 😂😂😂😂
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Reviewed in the United States on September 30, 2025
★★★★★ 4
Baby bumps and bodyguards
Format: Kindle
Dark, emotional, and unexpectedly tender, Not Ready is an omegaverse romance that delivers found family feels, fierce protectiveness, and a very pregnant heroine who refuses to break. Vale’s on the run from a stalker, but lands in the arms of three private security alphas, cue the swoony tension, fake marriage twist, and slow-burn heat.
It’s a little gritty, a little soft, and a whole lot addictive. If you love protective alphas, high stakes, and heroines with quiet strength, this one’s a must-read.
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Reviewed in the United States on December 18, 2025
★★★★★ 5
Strong Omegaverse Comfort and a Attention Grabbing Plot
Format: Kindle
Jillian West never misses when it comes to Omegaverse, and Not Ready is no exception. This story was the perfect blend of cozy comfort and emotional depth while still delivering a strong plot.
Vale is such a powerful heroine, she is strong, capable, and determined but I love that she still allows her pack to love and take care of her. It’s that balance of independence and vulnerability that makes her so relatable.
The relationship dynamics were amazing: Bishop is steadfast and completely head over heels, Mercy is skeptical but protective in his own way, and Holt is the hesitant one whose slow fall is so satisfying to watch unfold.
The romance hits that sweet spot between insta-love and cautious build, keeping me hooked the entire way through. And that ending. Oh my god, the cliffhanger! I need the next book in this duet immediately.
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Reviewed in the United States on August 28, 2025