Worn out leaf springs ??????

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Advice sought. I have a feeling that the leaf springs on my 91/92 Fourtrak 2.8 TDX,are past their sell by date, the front springs are very flat, almost horizontal, with only 1 inch clearance between the bump stop and the axle , on the rear again very little curvature, and approx 1 inch clearance. Any suggestions as to what the clearance should be, between the axle and the chassis.