To find the wet weight of your car, simply take the GVWR from your door jam (that is the 4,XXX lbs. that you saw) and subtract the passenger and cargo capacity. That number should be 9XX lbs. or 1,XXX lbs. depending on whether you have a bench seat up front or buckets. This will give you your wet weight (with full oil, washer fluid, fuel, coolent, break, and power stearing fluids). The payload capacity is also shown on your door jam. For clerification, the GVWR is the Grose Vehicle Weight Rating and is essentially the maximum weight the vehicle will weigh if FULLY loaded to capacity--but not one pound over.
Hope this helps.
P.*. I drove truck for seven years--I am very familiar with GVWR.
Retired Moderator, The Bonneville Club www.bonnevilleclub.com
RIP Oldsmobile, April 29
1995 Bonneville SE Supercharged (Stock)
Current Mods: Dirty GYM Sock air freshener.