Allison Stage III Kit
This kit is recommended for normal duty with up to 500 RWHP. Also comes with a Transgo Shift Kit®, Filter Kit and Allison Triple Disk Torque Converter.
Allison Stage IV Kit
Sun Coast engineered this kit and manufactures many key components that have made it possible to hold the torque that your Duramax is putting to the ground. We have assembled the best parts available for your Allison 1000 transmission and put it in a kit form to enable shops to build a dependable unit. This kit includes upgrades clutches for C-1, C-2, C-3 and C-4. Valve body upgrades, pump upgrades, filters and gaskets.
This kit when properly installed will enable the Allison to easily handle extreme power and load increases in excess of 700 RWHP.
Don't Be Deceived, not all so called Stage IV Kits are Sun Coast Products. Knock downs do not have the capabilities to perform at the levels you need to accomplish successful 700 plus HP. The components we offer are not offered in the “bootleg kits” shown in other ads.
*Price includes GM-1056-3D Torque Converter.
I think there is very little difference between the IV and the V.. might be the upgraded planetaries.