Allison 1000/2000/2400 Shift Kit Fits 6 Speed Allison 1000/2000/2400 Year models 2005-ON This Transgo Shift Correction Kit will improve all Duramax Gas/Diesel GMC or Chevy 6 Spd Allisont transmissions; for 5spd units use SK Allison. Ideal for Heavy Duty, Street, Show & Competition This heavy duty kit corrects the common problems with these transmissions; goes into neutral under load, 3-4 slip, burned C2 or C3 clutches, sticks in one gear, won't move after extended parking, loss of pump prime. This kit includes smart clutch control valves for increased durability and Short-Crisp-Smooth-upshifts and kickdowns. This kit also sets trouble codes. Handles 500 Street Horse Power!!! This kit Requires does not require transmission removal; Easy to Install. This Shift Correction Kit will come with installation directions. If you need a rebuild kit, Tech Manual spin on filter or parts for your Allison rebuild please see our store or ask us we will be glad to accommodate all of your part needs. We also anything you may need for a complete rebuild on these transmissions Please see my other listings or visit our store!