2018 GMC Terrain stereo and speaker fit
Speaker sizes that fit: 6x9" front doors, 6.5" or 6-3/4" rear doors. DJ Custom Audio in South Gate stocks stereos and speakers that fit and installs them in its own bay, often the same day.
What fits the 2018 GMC Terrain
| Vehicle | Dash opening | Center dash | Front doors | Rear doors |
|---|---|---|---|---|
| 2018 GMC Terrain | Confirm at the shop | Confirm at the shop | 6x9" ✓ Verified | 6.5" or 6-3/4" ✓ Verified |
In stock in South Gate
Gear for the 2018 GMC Terrain
Buy Now, Pay Later
JL Audio C3-650 6.5-inch Convertible Component Speakers
- 6.5 in convertible component
- 75 W RMS, 4 ohm
- 2.55 in mounting depth
$529.99
Buy Now, Pay Later
Kicker CS 46CSC674 6.75-inch Coaxial Speakers
- 100 W RMS
- 90 dB sensitivity
- Zero tweeter protrusion
$99.99
Kicker KS 51KSS6704 6.75-inch Component Speakers
- 15-125 W RMS
- 1 in silk tweeters
- 91 dB sensitivity
$249.99
Pick your exact year and trim in Shop by vehicle; Tony confirms the fit before you buy.
Install notes for the 2018 GMC Terrain
- Dash kit and wiring: Metra 95-3315B (single or double DIN).
- The dash opening is not confirmed for every trim yet, so Tony checks your trim before you buy a stereo.
- Some trims have factory Bose premium sound, which can wire differently; Tony checks your trim before you buy.
- Rear doors take 6.5" or 6-3/4" speakers, and we stock both sizes.
- Not confirmed yet: center dash. These say "Confirm at the shop" until our sources agree; Tony checks them with your trim.
Local pickup and install in South Gate
Everything is picked up at the shop, Cash & Carry: 8696 Atlantic Ave, South Gate. Buy Now, Pay Later with the Payment Plan (Snap, EasyPay, Synchrony, American First). Approval and terms set by the provider.
Sizes marked "Confirm at the shop" are ones our sources do not agree on yet, or that change by trim or premium audio. Tony checks before you buy. Fit data checked against Metra dash kit and speaker guides and Alpine vehicle fitment data and Crutchfield vehicle research.
Speaker upgrade
More for your GMC Terrain
GMC Terrain speaker upgrade guide
Car guides: Speakers, sub or amp: where to start · 6.5-inch speakers compared · 6x9 speakers compared
Other GMC Terrain years
- 2025–2026 GMC Terrain · 2023–2024 GMC Terrain · 2019–2022 GMC Terrain · 2015–2017 GMC Terrain · 2013–2014 GMC Terrain · 2010–2012 GMC Terrain
2018 GMC Terrain stereo and speaker fit: questions
What size speakers are in the 2018 GMC Terrain?
6x9" front doors, 6.5" or 6-3/4" rear doors. We stock speakers in these sizes in South Gate and install them.
Does the 2018 GMC Terrain have a premium sound system?
Some trims have factory Bose premium sound, which can wire differently. Tony checks your trim before you buy.
Are all the speaker sizes for the 2018 GMC Terrain confirmed?
Not yet: center dash still say "Confirm at the shop". Text (213) 674-9042 with your trim and Tony will check.
Will an aftermarket stereo fit the 2018 GMC Terrain?
The dash opening is not confirmed for every trim yet. Text (213) 674-9042 with your trim, and Tony will tell you which stereo and dash kit fit.
Can DJ Custom Audio install it?
Yes. Bring the 2018 GMC Terrain to 8696 Atlantic Ave, South Gate. Tony confirms the trim and installs in our own bay, often the same day. Text (213) 674-9042 or call (323) 944-7844.