2008 GMC Sierra 3500 HD Extended Cab Bolt Pattern
Checking fitment for your vehicle? Below you will find the factory bolt pattern (also known as the lug pattern) for the 2008 GMC Sierra 3500 HD Extended Cab, along with offset and center bore data.
| Bolt Pattern (Lug Pattern) | 8x165.1 (8x6.5") |
|---|---|
| Lug Nut / Bolt Size | 14x1.5 |
| Center Bore (CB) | 116.7 mm |
| Offset (ET) | 20-40 |
| Torque Specs | 140 ft-lbs (190 Nm) |
Imperial Match: 8x165.1 is commonly referred to as 8x6.5" in US Standard.
2008 Sierra 3500 HD Extended Cab — Year-Specific Fitment Context
The 2008 GMC Sierra 3500 HD Extended Cab is in year 2 of 4 using the 8x165.1 pattern (2007–2010). Wheels from any 2007–2010 GMC Sierra 3500 HD Extended Cab are cross-compatible with the 2008 model. Across its full production run (2007–2013), the Sierra 3500 HD Extended Cab has also used: 8x180.
GMC Sierra 3500 HD Extended Cab Bolt Pattern by Year
The table below shows how the Sierra 3500 HD Extended Cab's wheel specifications have changed over the years. The 2008 model year is highlighted.
8x165.1 Pattern Context
This bolt pattern appears on 846 vehicles in our current database and is considered common.
Examples of other vehicles using 8x165.1:
Expert Buying Guide for 2008 GMC Sierra 3500 HD Extended Cab
For your 2008 GMC Sierra 3500 HD Extended Cab, the 8x165.1 bolt pattern and 116.7mm center bore are critical. Aftermarket wheels often have a larger center bore, requiring hub-centric rings to prevent vibration and ensure proper load distribution. The offset range is 20-40mm; staying within this avoids rubbing or suspension interference. Always use 14x1.5 lug nuts with the correct seat (typically cone seat for aftermarket wheels). Incorrect lug nuts can cause wheel loosening. Verify wheel load rating meets or exceeds OEM specs for this heavy-duty truck.
Historical Fitment Data Reference
In our dataset, GMC Sierra 3500 HD Extended Cab appears from 2007 to 2013 (7 model years). Across model years, this model appears with 2 bolt patterns (8x165.1, 8x180).
- Observed bolt-pattern variants for this model: 2
- Observed center-bore variants for this model: 2
- Observed lug-size variants for this model: 1
- Observed total offset span across years: 84.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts after 50-100 miles of driving to ensure proper seating.
- ✅ Avoid wheels with offset below 20mm or above 40mm to prevent clearance issues with brakes and suspension.
- ✅ When using aftermarket wheels, always install hub-centric rings to match the 116.7mm center bore.
- ⚠️ This fitment uses a wide offset range. Check brake clearance and fender clearance before buying wheels.
- ⚠️ Torque lugs in a star pattern to 140 ft-lbs (190 Nm), then re-check torque after 50-100 km (30-60 miles).
- ⚠️ This model has multiple bolt-pattern records across years. Match wheels to exact year/trim before purchase.
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2008 GMC Sierra 3500 HD Extended Cab — Frequently Asked Questions
What is the bolt pattern for a 2008 GMC Sierra 3500 HD Extended Cab?
The 2008 GMC Sierra 3500 HD Extended Cab uses a 8x165.1 bolt pattern (also called lug pattern or PCD). The center bore is 116.7mm and the offset is 20-40mm.
What other years of GMC Sierra 3500 HD Extended Cab have the same bolt pattern as the 2008?
The GMC Sierra 3500 HD Extended Cab uses the 8x165.1 pattern from 2007 through 2010. Wheels from any of these model years are dimensionally compatible with the 2008, provided the offset and center bore also match.
What is the PCD for a 2008 GMC Sierra 3500 HD Extended Cab?
PCD stands for Pitch Circle Diameter, which is the same as the bolt pattern. For the 2008 Sierra 3500 HD Extended Cab, the PCD is 8x165.1.
What lug nut size does the 2008 GMC Sierra 3500 HD Extended Cab use?
The 2008 GMC Sierra 3500 HD Extended Cab uses 14x1.5 lug nuts. Always verify the thread pitch and seat type (cone, ball, or flat) match your aftermarket wheels.
Do 2008 GMC Sierra 3500 HD Extended Cabs use lug bolts or lug nuts?
The 2008 Sierra 3500 HD Extended Cab requires 14x1.5 hardware. Check your specific trim to ensure you use the correct conical or spherical seating.
Can I put aftermarket wheels on my 2008 GMC Sierra 3500 HD Extended Cab?
Absolutely. Just ensure the aftermarket wheels have a 8x165.1 bolt pattern, an offset near 20-40mm, and a center bore of at least 116.7mm (using hub rings if larger).
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