spring rates for 1981 J-trucks

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J10 118.7" WB  Front   / Rear
	5 leaf   215 lb/in  / 5 leaf 165 lb/in
opt:		 230 lb/in  / 	     265 lb/in
		 260 lb/in
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J10 130.7" WB  Front   / Rear
	5 leaf   215 lb/in  / 5 leaf 245 lb/in
opt:		 230 lb/in  / 	     265 lb/in
		 260 lb/in
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J20 130.7" WB  Front   / Rear
	7 leaf   260 lb/in  / 2 leaf 340 lb/in
opt:		 330 lb/in  / 	     510 lb/in
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