DHD RT-A01-PR Allison Transmission Line Pressure Upgrade Spring
This kit serves as a great upgrade when building your 5 or 6 speed Allison transmission. DHD has used this combination for years and highly recommend them! This kit is a must for trucks pulling big loads or making big power. This will provide a increase in line pressure that will improve your clutches holding ability. Secondly, the calibration springs will quicken and clean up your lazy shifts.
To get the best results add upgraded Trim Springs to your build.