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GMC Sierra 2500 HD Transmission Internals

Looking for aftermarket parts to modify or upgrade your GMC Sierra 2500 HD with transmission internals? At Tunersports.com we carry a huge selection of the top name brand performance transmission internal parts and accessories for your Sierra 2500 HD.

Whether you have a 2001 or 2016 GMC Sierra 2500 HD in Base to WT trim we have you covered. We have 8 transmission internals available to mod your Sierra 2500 HD. All parts have free shipping to the Continental US 48 States.

All Sierra 2500 HD Transmission Internal Parts:

Only show in-stock parts

ATS Diesel Billet Shafts

SHIPS FROM MANUFACTURER 3049104248 ATS Diesel Allison Billet Input Shaft 2001-2002 GMC Sierra 2500 HD SL 2001-2005 GMC Sierra 2500 HD SLE / SLT 2002-2005 GMC Sierra 2500 HD Base 2003-2005 GMC Sierra 2500 HD WT 2007-2010 GMC Sierra 2500 HD SLE / SLT / WT $815.79 Details

ATS Diesel Clutch Packs

SHIPS FROM MANUFACTURER 3088054248 ATS Diesel 2001-2010 ATS manufactured Allison C5 clutch pack 2001-2002 GMC Sierra 2500 HD SL 2001-2004 GMC Sierra 2500 HD SLE / SLT 2002-2004 GMC Sierra 2500 HD Base 2003-2004 GMC Sierra 2500 HD WT 2007-2010 GMC Sierra 2500 HD SLE / SLT / WT $304.56 Details

ATS Diesel Trim Valve Kits

SHIPS FROM MANUFACTURER 3039044248 ATS Diesel 2001-05 GM LCT1000 5-Speed Trim Valve Kit 2001-2002 GMC Sierra 2500 HD SL 2001-2004 GMC Sierra 2500 HD SLE / SLT 2002-2004 GMC Sierra 2500 HD Base 2003-2004 GMC Sierra 2500 HD WT $171.16 Details
SHIPS FROM MANUFACTURER 3039044308 ATS Diesel 2006+ GM LCT1000 6-Speed ATS Trim Valve Kit 2007-2010 GMC Sierra 2500 HD SLE / SLT / WT $171.16 Details

BD Diesel Built-It Trans Kits

OUT OF STOCK 1062204 Same parts used in our own performance transmissions; All kits include the basic rebuild parts and gaskets; C1 Clutch Pack Raybestos Z-Pack; C2 Clutch Pack Raybestos Z-Pack; C3 Plate Assembly - BD Machined; C3/C4 Friction Plate Allomatic; C3/C4 Piston - BD Machined; C3/C4 Reaction Plate; C3/C4 Sprin... BD Diesel Built-It Trans Kit 2000-2004 LB7 Chevy Allison Stage 4 Master Rebuild Kit 2001-2002 GMC Sierra 2500 HD SL 2001-2004 GMC Sierra 2500 HD SLE / SLT 2002-2004 GMC Sierra 2500 HD Base 2003-2004 GMC Sierra 2500 HD WT $2,291.60 Details
OUT OF STOCK 1062214 Same parts used in our own performance transmissions; All kits include the basic rebuild parts and gaskets; C1 Clutch Pack Raybestos Z-Pack; C2 Clutch Pack Raybestos Z-Pack; C3 Plate Assembly - BD Machined; C3/C4 Friction Plate Allomatic; C3/C4 Piston - BD Machined; C3/C4 Reaction Plate; C3/C4 Sprin... BD Diesel Built-It Trans Kit 2004-2006 Chevy LLY Allison Stage 4 Master Rebuild Kit 2004-2005 GMC Sierra 2500 HD Base 2004-2006 GMC Sierra 2500 HD SLE / SLT / WT 2006-2006 GMC Sierra 2500 HD SL $2,291.60 Details
OUT OF STOCK 1062224 Same parts used in our own performance transmissions; All kits include the basic rebuild parts and gaskets; C1 Clutch Pack Raybestos Z-Pack; C2 Clutch Pack Raybestos Z-Pack; C3 Plate Assembly - BD Machined; C3/C4 Friction Plate Allomatic; C3/C4 Piston - BD Machined; C3/C4 Reaction Plate; C3/C4 Sprin... BD Diesel Built-It Trans Kit 2006-2007 Chevy LBZ 6spd Allison Stage 4 Master Rebuild Kit 2006-2006 GMC Sierra 2500 HD SL 2006-2010 GMC Sierra 2500 HD SLE / SLT / WT $2,291.60 Details

BD Diesel Trans Components

IN STOCK - DROPSHIPS 1031315 25% to 115% more theoretical holding power; Delivers up to 275psi line pressure at WOT; Only active when boost over 15psi, unlike solenoid foolers or plugs which are active all the time; Does not create parasitic load or extra heat when inactive; Does not cause clunky or unusual shifts due to dynami... BD Diesel Allison Pressure Controller - 2011-2016 Chevy Duramax 6.6L 2011-2014 GMC Sierra 2500 HD WT 2011-2016 GMC Sierra 2500 HD Denali / SLE / SLT 2015-2016 GMC Sierra 2500 HD Base $335.95 Details