Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Vehicle Info NeededShift Improver Kit 1981-1990 GM TH2004R
Ships on 11/13/2026
Lowest Price Guarantee- Shift Improver Kit
- 1981-1990 GM TH2004R
- Includes Gaskets, Seals, Drill Bit and Fluid Separators
B&M Shift Improver Kit - GM TH2004R Transmissions.
- 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
Performance Made Easy, Two Kits in One!
B&M Shift Improver Kits are the easiest and most affordable way to gain automatic transmission performance results. B&M's kits modify an automatic transmission's shift timing in order to increase shift firmness and in-turn improve durability. These dual stage performance shift kits are application specific and contain your choice of Heavy Duty or Street/Strip configurations. Shift Improver Kits provide well appointed, crisp shifts delivering unmatched performance.
Show More
Stage 1 - Heavy Duty:
Firm, positive shifts without loss of passenger comfort for improved performance in all street vehicles. Recommended for normal passenger vehicles and tow vehicles.
Stage 2 - Street/Strip:
Provides positive shifts for high performance street use or competitive events. This configuration is for the enthusiast who wants hard, fast shifts.
Features:
- Recalibrate your transmission’s shift timing.
- Select the configuration that best suits your application.
- Provides well appointed, crisp shifts.
- Eliminates excessive shift overlap.
- Less wear and tear on your transmission’s clutches and bands.
