2004 GMC Sierra 3500 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 2004 GMC Sierra 3500 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.
2004 Sierra 3500 Extended Cab — Year-Specific Fitment Context
The 2004 GMC Sierra 3500 Extended Cab is in year 4 of 6 using the 8x165.1 pattern (2001–2006). Wheels from any 2001–2006 GMC Sierra 3500 Extended Cab are cross-compatible with the 2004 model.
GMC Sierra 3500 Extended Cab Bolt Pattern by Year
The table below shows how the Sierra 3500 Extended Cab's wheel specifications have changed over the years. The 2004 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 2004 GMC Sierra 3500 Extended Cab
For your 2004 GMC Sierra 3500 Extended Cab, the critical center bore is 116.7mm. Aftermarket wheels often have a larger bore, requiring hub-centric rings to prevent vibration and ensure proper load distribution. The offset range is 20-40mm; staying within this range avoids suspension and brake clearance issues. Always use the correct lug nuts: 14x1.5 thread pitch with a conical (60-degree) or ball seat, depending on the wheel. Never use incorrect seat types, as this can cause lug nuts to loosen. Safety first: verify all specs before installation.
Historical Fitment Data Reference
In our dataset, GMC Sierra 3500 Extended Cab appears from 2001 to 2006 (6 model years). Across recorded model years, this model generally keeps the same bolt pattern.
- Observed bolt-pattern variants for this model: 1
- Observed center-bore variants for this model: 1
- Observed lug-size variants for this model: 1
- Observed total offset span across years: 60.0 mm
Quick Tips & Safety Warnings
- ✅ Re-torque lug nuts after 50-100 miles of driving to maintain proper clamping force.
- ✅ Ensure aftermarket wheels have a minimum load rating of 3,500 lbs per wheel for this heavy-duty truck.
- ✅ Check for caliper clearance when using wheels with offset near 20mm; some aftermarket wheels may require spacers.
- ⚠️ 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).
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2004 GMC Sierra 3500 Extended Cab — Frequently Asked Questions
What is the bolt pattern for a 2004 GMC Sierra 3500 Extended Cab?
The 2004 GMC Sierra 3500 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 Extended Cab have the same bolt pattern as the 2004?
The GMC Sierra 3500 Extended Cab uses the 8x165.1 pattern from 2001 through 2006. Wheels from any of these model years are dimensionally compatible with the 2004, provided the offset and center bore also match.
How do I measure the bolt pattern on my 2004 GMC?
The 2004 Sierra 3500 Extended Cab uses a 8x165.1 pattern. For 4, 6, or 8-lug wheels, measure center-to-center across opposite holes. For 5-lug, measure from the center of one hole to the back of the opposite hole.
Why is matching the 116.7mm center bore important for the 2004 Sierra 3500 Extended Cab?
The 116.7mm center bore ensures the wheel is perfectly centered on the hub. If the wheel is lug-centric instead of hub-centric, you may experience steering wheel vibration at highway speeds.
What does 20-40mm offset mean for the 2004 Sierra 3500 Extended Cab?
An offset of 20-40mm means the wheel's mounting surface is 20-40mm away from its centerline. Changing this value drastically can affect suspension geometry and wheel bearing wear on your GMC.
Will wheels from another GMC fit my 2004 Sierra 3500 Extended Cab?
Only if they share the exact same 8x165.1 bolt pattern, a compatible offset, and a center bore equal to or larger than 116.7mm.
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