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Sources: Wikipedia, plus brochures and pictures comparison. There can (or must? 
) be errors or omissions, so feel free to propose your corrections.
For reference, as the numerous changes of makes can lead to some mixes when identifying these trucks. In a nutshell:
• 1980: Volvo acquires the US part of the White Motor Company.
⇒ 1981?: New grille for the Volvo-White trucks, with a diagonal bar as a reminder of the one of Volvo.
• 1987: Volvo purchases GMC's heavy truck business and merged it with White, creating the White-GMC brand.
⇒ 1988: New emblem WhiteGMC on trucks.
• 1997: Volvo drops any reference to White.
⇒ new grille change, now with the Volvo diagonal bar and logo (except on Autocar trucks);
• 2000: Volvo sells Autocar to Grand Vehicle Works together with the Xpeditor.
I didn't find any precise date about these events, but I assume that the year of the changes on trucks can be understand as model year.
Xpeditor models:
Road Xpeditor / Road Xpeditor 2 / Xpeditor... From what I have seen, Road Xpeditor 2 and Xpeditor "only" seem to be the same trucks. Was it just a name change made in 1978 or 1979? Or did it only occur when Volvo purchased White?
There is at least one brochure with Xpeditor only as name showing a "White only" grille, but also a 1980 one (with "All rights reserved 1980" written inside) still with the Road Xpeditor 2 name...
There was also a 6000-Series Xpeditor in early 1970s:
) be errors or omissions, so feel free to propose your corrections.For reference, as the numerous changes of makes can lead to some mixes when identifying these trucks. In a nutshell:
• 1980: Volvo acquires the US part of the White Motor Company.
⇒ 1981?: New grille for the Volvo-White trucks, with a diagonal bar as a reminder of the one of Volvo.
• 1987: Volvo purchases GMC's heavy truck business and merged it with White, creating the White-GMC brand.
⇒ 1988: New emblem WhiteGMC on trucks.
• 1997: Volvo drops any reference to White.
⇒ new grille change, now with the Volvo diagonal bar and logo (except on Autocar trucks);
• 2000: Volvo sells Autocar to Grand Vehicle Works together with the Xpeditor.
I didn't find any precise date about these events, but I assume that the year of the changes on trucks can be understand as model year.
Xpeditor models:
Road Xpeditor / Road Xpeditor 2 / Xpeditor... From what I have seen, Road Xpeditor 2 and Xpeditor "only" seem to be the same trucks. Was it just a name change made in 1978 or 1979? Or did it only occur when Volvo purchased White?
There is at least one brochure with Xpeditor only as name showing a "White only" grille, but also a 1980 one (with "All rights reserved 1980" written inside) still with the Road Xpeditor 2 name...
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1972?-75? White Road Xpeditor (Square cab, huge emblem, wipers on top...) | 1976?-80? White Road Xpeditor 2 / Xpeditor |
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1981?-87 Volvo-White Xpeditor (Sold as White - New grille and framed emblem) | 1988-96 Volvo-WhiteGMC Xpeditor Sold as WhiteGMC (The only difference with the Volvo-White model is the "WhitheGMC" emblem) |
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1997-2000 Volvo Xpeditor | The Autocar version, still produced |
There was also a 6000-Series Xpeditor in early 1970s: