I don't think there should be any difference and at that point, some of the younger guys just think 88 was the cut-off.
Tell them you specifically have a "V1500" Suburban. In 1991, they never made a "C" or "K" for our body style (that went to the new ifs pickups).
If they still don't understand, just say 87......
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- Jeff
89' K5 Blazer, 2.5" lift, 35" tires

04' GMC Yukon XL, 3/4 ton, 8.1L