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Ships within 48 hours · Estimated delivery Sep 20 - Sep 25
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For Your Every Summer RSVP, with Code: SUMMER15
Description
B&M Shift Improver Kit - GM TH400/475 Transmissions - 20261Overview: The B&M Shift Improver kits feature two options to recalibrating your 1988 1994 GM TH400 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
Overview:
The B&M® Shift Improver kits™ feature two options to recalibrating your 1988-1994 GM TH400 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 Off-Road, Towing or Street/Strip Use
- Eliminates Soft and Sluggish Shifts
- Over 65 Years of B&M Quality
- Eliminates Shift Overlap
- Provides Crisp Shifts
- Easy Installation
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| 1988 | Chevrolet | R20 | Custom Deluxe | |
| 1988 | Chevrolet | R20 | Scottsdale | |
| 1988 | Chevrolet | R20 | Silverado | |
| 1988 | Chevrolet | R20 Suburban | ||
| 1989 | Chevrolet | R2500 | ||
| 1989 - 1990 | Chevrolet | R2500 Suburban | ||
| 1988 | Chevrolet | R30 | ||
| 1989 - 1990 | Chevrolet | R3500 | ||
| 1990 | Chevrolet | V1500 Suburban | ||
| 1988 | Chevrolet | V20 Suburban | ||
| 1989 - 1990 | Chevrolet | V2500 Suburban | ||
| 1988 | Chevrolet | V30 | ||
| 1989 - 1990 | Chevrolet | V3500 | ||
| 1988 - 1990 | GMC | C1500 | ||
| 1988 - 1990 | GMC | C2500 | ||
| 1988 - 1990 | GMC | C3500 | ||
| 1988 - 1990 | GMC | G1500 | ||
| 1988 - 1990 | GMC | G2500 | ||
| 1988 | GMC | G3500 | Rally | |
| 1988 | GMC | G3500 | Rally STX | |
| 1988 | GMC | G3500 | Vandura | |
| 1988 | GMC | G3500 | Rally Custom | |
| 1988 | GMC | G3500 | Magnavan | |
| 1988 | GMC | G3500 | Rally Camper Special | |
| 1988 | GMC | G3500 | Vandura Special | |
| 1989 - 1990 | GMC | G3500 | ||
| 1988 - 1990 | GMC | Jimmy | ||
| 1988 - 1990 | GMC | K1500 | ||
| 1988 - 1990 | GMC | K2500 | ||
| 1988 - 1990 | GMC | K3500 | ||
| 1988 - 1989 | GMC | P2500 | ||
| 1988 - 1990 | GMC | P3500 | ||
| 1990 | GMC | R1500 Suburban | ||
| 1988 - 1989 | GMC | R2500 | ||
| 1988 - 1990 | GMC | R2500 Suburban | ||
| 1988 - 1990 | GMC | R3500 | ||
| 1990 | GMC | V1500 Suburban | ||
| 1988 - 1990 | GMC | V2500 Suburban | ||
| 1988 - 1990 | GMC | V3500 | ||
| 1988 - 1990 | Cadillac | Brougham | ||
| 1988 - 1990 | Chevrolet | Blazer | ||
| 1990 | Chevrolet | C1500 | Cheyenne | |
| 1990 | Chevrolet | C1500 | Scottsdale | |
| 1990 | Chevrolet | C1500 | Silverado | |
| 1990 | Chevrolet | C1500 | 454 SS | |
| 1990 | Chevrolet | C1500 | WT | |
| 1988 - 1989 | Chevrolet | C1500 | ||
| 1988 - 1990 | Chevrolet | C2500 | ||
| 1988 - 1990 | Chevrolet | C3500 | ||
| 1988 - 1990 | Chevrolet | G10 | ||
| 1988 - 1990 | Chevrolet | G20 | ||
| 1988 - 1990 | Chevrolet | G30 | ||
| 1988 - 1990 | Chevrolet | K1500 | ||
| 1988 - 1990 | Chevrolet | K2500 | ||
| 1988 - 1990 | Chevrolet | K3500 | ||
| 1988 - 1989 | Chevrolet | P20 | ||
| 1988 - 1990 | Chevrolet | P30 | ||
| 1990 | Chevrolet | R1500 Suburban | ||
| 1988 | Chevrolet | R20 | Cheyenne |
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 |
| 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
4.2 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
One size smaller is perfect!
Color: Navy, Size: 10 Years
This suit fit perfect but I did order one size smaller than my grandson normally wears. It is very well made and he can't wait to wear it in the wedding.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2026
★★★★★ 5
Suit
Color: Beige, Size: 10 Years
Our grandson looked so handsome!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
★★★★★ 3
Fits wide
Color: Navy, Size: 7 Years
Nice suit but fits wide IMO
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
★★★★★ 5
Slim and Sleek
Size: Small, Color: Black, Size: Small, Color: Black
This slim fit suit was awesome and great. My son loved it and it went perfectly well with my daughter's dress. The perfect way to twin. If anything my son is 5'3 120 lbs and the pants and coat fit a bit long and just took it to a seamstress to get it better fitted for him. Other than that for the price, value, comfort, and look I highly recommend this and so does my son.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026
★★★★★ 5
Suited me Well
Size: Small, Color: Black
This 2 Piece Slim Fit Suit Set is hands down the best suit for the price.
I bought it for a formal Christmas work party, and it was such a cheap, easy, and quick way to get exactly what I needed — especially since I hate shopping. Honestly, you would never guess I paid as little as I did. It looks sharp, fits great, and feels much more expensive than it is.
The color was a true black, which I really appreciated. It looked clean and classic — perfect for a formal event. It did arrive a bit wrinkled from the packaging, so I had to iron it initially. But it was very easy to iron, and once I did, it stayed pretty crisp throughout the night. It didn’t wrinkle much at all while wearing it.
It’s also way better than going to a store and paying triple the price. And definitely better than renting — now I actually own it and can wear it again whenever I need it.
The fit is perfect if you’re slim. I’m skinny as a rail, and the slim fit worked exactly how I hoped. The jacket isn’t too tight, not too long, and I can move my arms easily without feeling restricted. The whole suit is comfortable and easy to move around in — not stiff like some formalwear can be. It also has handy pockets for your phone and wallet.
Overall, you can’t go wrong with this suit. Great price, true black color, comfortable fit, and sharp look. Highly recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 22, 2026
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