Quote Originally Posted by aekhong View Post
Because 34xx=4.3 inches , 35xx=5 inches. (I think that).
nüvi® 3790LMT
Unit dimensions, WxHxD: 4.8"W x 2.9"H x .35"D (12.2 x 7.5 x .89 cm)
Display size, WxH: 3.7"W x 2.2"H (9.4 x 5.6 cm); 4.3" diag (10.9 cm)
Display resolution, WxH: 800 x 480 pixels
Display type: glass, dual-orientation, WVGA color TFT with white backlight
Weight: 4 ounces (113.4 g)

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nüvi® 3590LMT
Unit dimensions, WxHxD: 5.4"W x 3.4"H x 0.5"D (13.8 x 8.7 x 1.3 cm)
Display size, WxH: 4.4"W x 2.5"H (11.1 x 6.3 cm); 5" diag (12.7 cm)
Display resolution, WxH: 800 x 480 pixels
Display type: multi-touch, glass, dual-orientation, WVGA color TFT with white backlight
Weight: 7.2 ounces (203 g)

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nüvi® 3490LMT
Unit dimensions, WxHxD: 4.8"W x 2.9"H x .35"D (12.2 x 7.4 x .9 cm)
Display size, WxH: 3.7"W x 2.2"H (9.4 x 5.6 cm); 4.3" diag (10.9 cm)
Display resolution, WxH: 800 x 480 pixels
Display type: multi-touch, glass, dual-orientation, WVGA color TFT with white backlight
Weight: 4.2 ounces (118 g)
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