I am trying to find out the exact information I need for a front / rear gear swap and having found the following:
I remember when I did a gear swap in a Cutlass the differential supported up to a 3.23 gear but anything higher either required a ring gear spacer or a different differential to support 3.73 gears. Is this true for our rigs? According to Yukon Gear it says that there are Carrier breaks. As you can see the gears basically fit every single GM product known to man so finding the gears shouldn't be a problem!
Currently I have a 2014 Yukon XL 4wd (it is the classic style and not the newer trim upgrade that some of the newer 2014's have) and has the awful 3.08 gears. 1700RPM @ 80mph is a bit low IMO.
Yukon Gears for 2014+
GM 8.25 IFS Front 2010 & Newer
2010 & newer GM 8.25 IFS Aluminum front housing found in GM vehicles. Uses 8.25" reverse cut ring gear
• Ring Gear Diameter: 8.250
• Cover Bolts:
• Ring Gear Bolts: 10
• Spline Count: 28
• Dropout: True
• Pinion Support: False
• Carrier Breaks: 3.23 / 3.42
• Rear Suspension:
• Pinion Nut Size: 1-1/4
=====================================
GM 9.5" Rear, '14 & up
GM 9.5" rear with 12 bolt cover and 33 spline axles. 5.3L V8
• Ring Gear Diameter: 9.500
• Cover Bolts: 12
• Ring Gear Bolts: 12
• Spline Count: 33
• Dropout: False
• Pinion Support: False
• Carrier Breaks: 3.08 / 3.23
• Rear Suspension: Solid
• Pinion Nut Size: 32mm
I remember when I did a gear swap in a Cutlass the differential supported up to a 3.23 gear but anything higher either required a ring gear spacer or a different differential to support 3.73 gears. Is this true for our rigs? According to Yukon Gear it says that there are Carrier breaks. As you can see the gears basically fit every single GM product known to man so finding the gears shouldn't be a problem!
Currently I have a 2014 Yukon XL 4wd (it is the classic style and not the newer trim upgrade that some of the newer 2014's have) and has the awful 3.08 gears. 1700RPM @ 80mph is a bit low IMO.
Yukon Gears for 2014+
GM 8.25 IFS Front 2010 & Newer
2010 & newer GM 8.25 IFS Aluminum front housing found in GM vehicles. Uses 8.25" reverse cut ring gear
• Ring Gear Diameter: 8.250
• Cover Bolts:
• Ring Gear Bolts: 10
• Spline Count: 28
• Dropout: True
• Pinion Support: False
• Carrier Breaks: 3.23 / 3.42
• Rear Suspension:
• Pinion Nut Size: 1-1/4
=====================================
GM 9.5" Rear, '14 & up
GM 9.5" rear with 12 bolt cover and 33 spline axles. 5.3L V8
• Ring Gear Diameter: 9.500
• Cover Bolts: 12
• Ring Gear Bolts: 12
• Spline Count: 33
• Dropout: False
• Pinion Support: False
• Carrier Breaks: 3.08 / 3.23
• Rear Suspension: Solid
• Pinion Nut Size: 32mm