1989 GMC Vandura (G-Series) Speaker Sizes

The 1989 GMC Vandura factory audio system includes specific mounting points where the dashboard accepts 4x6 inch speakers, and the rear door panel accommodates a 6x9 inch speaker size. Component and full-range units serve as standard compatible speaker types for an audio replacement or system upgrade.

Specific details regarding locations, speaker sizes, and types are outlined in the compatibility chart.

Speaker Details by Location
Location Size Type Notes
Dashboard 4x6 Full-Range
  • Requires panel disassembly
  • Medium replacement priority
  • Replacement difficulty: medium
Rear Door Panel 6x9 Full-Range
  • Standard installation
  • Medium replacement priority
  • Replacement difficulty: low

1989 GMC Vandura (G-Series) Speaker Replacement Summary

2 total positions
1 easy to replace
0 high priority
0 professional only

Replacement difficulty:

Low: 1 Medium: 1 High: 0

Replacement priority:

High: 0 Medium: 2 Low: 0

Additional Notes

  • The dashboard location in the 1989 GMC Vandura takes a 4x6 inch speaker, which is the smaller of the two positions available in this vehicle. The 4x6 inch size tends to have a more limited selection of aftermarket options compared to more common sizes, so this position could be considered a lower priority when planning a speaker upgrade.
  • The rear door panel position accommodates a 6x9 inch speaker, which is generally associated with a wider frequency response and greater cone surface area. This larger size may allow for more noticeable low-frequency output, suggesting the rear door panel could be the higher priority location for audio improvement.
  • Both positions are listed as compatible with full-range speaker types, meaning each location appears suited for drivers that handle the full audible spectrum without requiring supplemental tweeters or subwoofers. A full-range configuration in both spots could contribute to a more balanced and even sound across the cabin.
  • Given the size difference between the two locations, the rear 6x9 inch position would likely yield a more substantial shift in overall audio quality compared to the 4x6 inch dashboard location. Addressing the larger position first may reflect the more impactful starting point for replacement.