Product Description
Improve torque converter performance and transmission reliability with the TransGo A1-LU-BST Lock-Up Boost Valve, designed specifically for 2001-2003 GM 2500HD/3500HD trucks equipped with the Allison 5-speed transmission. This precision-engineered upgrade increases lock-up clutch apply pressure, helping eliminate slip and improve holding capacity under load.
WHY INSTALL THE TRANSGO A1-LU-BST?
- Increases torque converter clutch apply pressure
- Reduces or eliminates lock-up slip under load
- Improves towing performance and power transfer
- Helps prevent premature clutch wear and heat buildup
- Ideal for stock, tuned, and heavy-duty towing applications
- Precision-engineered for Allison 1000 5-speed transmissions
FITMENT
- 2001 GM Silverado 2500HD / 3500HD – 6.6L Duramax LB7
- 2002 GM Silverado 2500HD / 3500HD – 6.6L Duramax LB7
- 2003 GM Silverado 2500HD / 3500HD – 6.6L Duramax LB7
- 2001-2003 GMC Sierra 2500HD / 3500HD – 6.6L Duramax LB7
- Equipped with Allison 1000 5-speed automatic transmission
WHAT THIS UPGRADE DOES
The factory lock-up boost valve can limit converter clutch apply pressure, especially under higher torque conditions. The TransGo A1-LU-BST upgrade increases hydraulic pressure to the torque converter clutch, resulting in firmer lock-up, reduced slip, and improved power transfer. This is critical for trucks used in towing, hauling, or performance applications where transmission slip can lead to excessive heat and wear.
Specifications for TRANSGO A1-LU-BST
| Specification | Details |
|---|---|
| Part Number | A1-LU-BST |
| UPC | 810159321235 |
| GTIN | 810159321235 |
| Shipping Info | Calculated at checkout |
| Application | Allison 1000 5-Speed Transmission |
| Prop 65 | Yes – www.P65Warnings.ca.gov |
FAQ
What problem does the A1-LU-BST fix?
It fixes weak or slipping torque converter lock-up by increasing apply pressure inside the transmission.
Is this needed for towing?
Yes. Towing increases load on the converter, and this upgrade helps maintain solid lock-up and reduces heat buildup.
Will this improve transmission life?
Yes. By reducing slip and heat, it helps extend clutch life and overall transmission durability.
Can this be used on a stock truck?
Absolutely. It’s beneficial for both stock and modified trucks, especially those used for towing or hauling.
Is tuning required?
No tuning is required. This is a mechanical hydraulic upgrade inside the transmission.
