Availability

- In Stock Items. Ships Today. (4) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- In Stock Items, Including at a Supplier. Ships In a Few Days. (4) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
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Make/Engine
Transmission Manufacturer Code
- THM400 (2) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- 3L80 (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- M40 (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- THM200-4R (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- THM375/M39 (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.
- THM700-R4/4L60/MD8 (1) The options in this area are not available since you have already selected choices in the area. Use the "Get Results" button for your current choices.

B&M Shift Improver Kits

4.57 out of 5 stars 109 Customer Reviews

B&M Shift Improver kits are the easiest way to get the stout performance you've always wanted out of your automatic transmission. All you need are some hand tools and an afternoon, and you can turn your transmission into a B&M-tuned unit. Each kit has two stages to fit your needs: RV/Towing and Street/Strip.

Showing In Stock Items. Show All 5 Items.