The B&M Shift Improver Kit the easiest way to get the stout performance you’ve always wanted out of your automatic transmission And you get two modes of performance to select from: Heavy Duty, or Street/Strip. It’s our least expensive and simplest to install kit. All you need are a few dollars and some hand tools! In the space of an afternoon, you can turn your transmission into a B&M-tuned unit! Just ask the thousands of satisfied customers that have installed one in their transmissions!

Application:

• 1981-1985 BUICK ELECTRA Automatic Trans 4-Speed Trans THM200-4R Trans
• 1986-1987 BUICK ELECTRA
• 1981-1983 BUICK ESTATE WAGON Automatic Trans 4-Speed Trans THM200-4R Trans
• 1981-1988 BUICK LESABRE Automatic Trans 4-Speed Trans THM200-4R Trans
• 1985-1990 BUICK LESABRE
• 1982-1987 BUICK REGAL Automatic Trans 4-Speed Trans THM200-4R Trans
• 1987-1990 CADILLAC BROUGHAM Automatic Trans 4-Speed Trans THM200-4R Trans
• 1985-1985 CADILLAC COMMERCIAL CHASSIS Automatic Trans 4-Speed Trans THM200-4R Trans
• 1981-1983 CADILLAC DEVILLE Automatic Trans 4-Speed Trans THM200-4R Trans
• 1984-1984 CADILLAC DEVILLE
• 1981-1984 CADILLAC FLEETWOOD Automatic Trans 4-Speed Trans THM200-4R Trans
• 1985-1986 CADILLAC FLEETWOOD