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Measure the distance between the spring bolts.
If they are the same length they will work.
Call a salvage yard and ask them what years are interchangable with your truck year.
A spring shop can give you the same info, but they will wanna sell you new ones, so they might not be so forth coming with the info.
That seems to be about normal from most I have looked at. My 86 only had 3/4" and was bottoming out constantly. When I installed my plow it was on the bumpers when the blade was up.
I went to NAPA and got a set of Ride Rite air helpers for 300 dollars. Gained 5000 pounds capacity on the front axle and depending on the amount of air in the bags from 0 to 2.5" of extra clearance. I run 25 pounds of pressure at all times and 90 when I have my plow on. Best investment I made due to better ride quality since I bought the truck.
Did you ever replace the springs? I only have about 1/2 inch between the frame and the bump stop and was planning on swapping the springs with new ones this weekend. I don't run a plow on her, but I do a fair amount of off roading. Would you recomend the Ride Rites for off roading?
Never did replace the springs. I think the Ride Rite is worth its weight in gold. Easy to adjust with an air hose. Get the spring stop away from the bumper block and keep it there. Since the springs are not bottoming out the ride was way better as soon as I aired them up. I have really been thinging about adding a set to the rear as well. They also make a kit that lets you adjust the air pressure from the drivers seat. IE more clearance when you need it with the twist of a ****. Air ride is also much better than any spring ever thought about being able to provide.