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Gear Ratio Recommendations Tire Size Highway OEM Towing 31" to 33" 3.08 3.42 3.73 34" to 36" 3.73 4.11 4.56 37" to 39" 4.56 4.88 5.13 Tools: Gear Ratio Calculator / Engine RPM Calculator

Locker Recommendations Chevy 1500 series trucks feature a slightly undersized aluminum "clam shell" style front IFS differential. While gears can be replaced to account for larger tire sizes, we do not recommend lockers for the front of these trucks. For the rear, we highly recommend the Eaton TrueTrac for most applications or a selectable ARB Air Locker for extreme off-road use.

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Chevy Silverado / GMC Sierra 1500 (1999-2007)

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The following gears, lockers and install kits are available for 1999-2007 Chevy Silverado and GMC Sierra 1500 Series Trucks with GM 8.25" IFS front axles and GM 8.6" or GM 9.5" rear axles.

Front Axle: GM 8.25" IFS 28 Spline (IFS) No Carrier Break Reverse Rotation Gears 3.08R 3.42R 3.73R 4.11R 4.56R 4.88R 5.13R Install Kits Master (All) Minor (All) Lockers § Not Available § Due to the limited strength of the GM 8.25" IFS axle housing, lockers are not recommended for this application.

Rear Axle: GM 8.6" 10-Bolt 30 Spline C-Clip 2.56/2.73 Carrier Break Standard Rotation Gears 2.73 3.08 3.23 3.42 3.73 4.11 4.56 4.88 5.13 5.38 5.57 Install Kits Master (99-08)* Master (09+)* Minor (All) Lockers OX Locker ARB Air Locker Eaton E-Locker Eaton TrueTrac Detroit Locker * In 2009, the GM 8.6" axle was modified to use different pinion bearings and pinion seals. Rear Axle: GM 9.5" 14-Bolt 33 Spline C-Clip No Carrier Break Standard Rotation Gears 3.42 3.73 4.11 4.56 4.88 5.13 5.38 Install Kits Master (All) Minor (All) Lockers ARB Air Locker Eaton TrueTrac Detroit Locker (For '02-'05 Silverado trucks with Quadrasteer, contact us).

© Copyright Filthy Motorsports, DrivetrainShop.com - Do Not Copy or Reproduce Without Written Permission.

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Chevy Silverado / GMC Sierra 1500 (2007-2013)

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The following gears, lockers and install kits are available for 2007-2013 Chevy Silverado and GMC Sierra 1500 Series Trucks with GM 8.25" IFS front axles and GM 8.6" or GM 9.5" rear axles.

Front Axle: GM 8.25" IFS 28 Spline (IFS) No Carrier Break Reverse Rotation Gears 3.08R 3.42R 3.73R 4.11R 4.56R 4.88R 5.13R Install Kits Master (All) Minor (All) Lockers § Not Available § Due to the limited strength of the GM 8.25" IFS axle housing, lockers are not recommended for this application. *In 2010, the GM 8.25" aluminum housing changed, but all of the internal parts remain the same.

Rear Axle: GM 8.6" 10-Bolt 30 Spline C-Clip 2.56/2.73 Carrier Break Standard Rotation Gears 2.73 3.08 3.23 3.42 3.73 4.11 4.56 4.88 5.13 5.38 5.57 Install Kits Master (07-08)* Master (09+)* Minor (All) Lockers OX Locker ARB Air Locker Eaton E-Locker Eaton TrueTrac Detroit Locker * In 2009, the GM 8.6" axles was modified to use different pinion bearings and pinion seals. Rear Axle: GM 9.5" 14-Bolt 33 Spline C-Clip No Carrier Break Standard Rotation Gears 3.42 3.73 4.11 4.56 4.88 5.13 5.38 Install Kits Master (All) Minor (All) Lockers ARB Air Locker Eaton TrueTrac Detroit Locker

© Copyright Filthy Motorsports, DrivetrainShop.com - Do Not Copy or Reproduce Without Written Permission.

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Chevy Silverado / GMC Sierra 1500 (2014-2019)

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The following gears, lockers and install kits are available for 2014 to 2019 Chevy Silverado and GMC Sierra 1500 Series Trucks with GM 8.25" IFS front axles and GM 8.6", GM 9.5", or GM 9.76" rear axles.

Front Axle: GM 8.25" IFS 28 Spline (IFS) No Carrier Break Reverse Rotation Gears 3.08R 3.42R 3.73R 4.11R 4.56R 4.88R 5.13R Install Kits Master (All) Minor (All) Lockers § Not Available § Due to the limited strength of the GM 8.25" IFS axle housing, lockers are not recommended for this application.

Rear Axle: GM 8.6" 10-Bolt 30 Spline C-Clip 2.56/2.73 Carrier Break Standard Rotation Gears 2.73 3.08 3.23 3.42 3.73 4.11 4.56 4.88 5.13 5.38 5.57 Install Kits Master (All) Minor (All) Lockers OX Locker ARB Air Locker Eaton E-Locker Eaton TrueTrac Detroit Locker Rear Axle: GM 9.5" 12-Bolt (5.3L V8) 33 Spline C-Clip 3.23 / 3.42 Carrier Break Standard Rotation Gears 3.08 3.42 3.73 4.10 4.56 4.88 Install Kits Master (All) Minor (All) Lockers Rear Axle: GM 9.76" 12-Bolt (6.2L V8 and/or Tow Package) 33 Spline C-Clip 3.23 / 3.42 Carrier Break Standard Rotation Gears 3.23 3.42 3.73 Install Kits Master (All) Minor (All) Lockers

© Copyright Filthy Motorsports, DrivetrainShop.com - Do Not Copy or Reproduce Without Written Permission.

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