Monroe has a feature on their web site to find the proper shock, but I'm not sure it goes that far back. I just replaced some very old and worn out Monroe Gas Magnums on my '59 fleetside. This truck has been converted to 4WD and I'm running 33"s. I'm planning on doing some 'wheeling so I put ProComp es3000's on it and the difference is huge. ProComp are s'posed to be made by the same company that makes Ranchos (Tenneco). I had Rancho rx9000 on my '94 Silverado/Z71 with the In-cab adjustment and they were fantastic, soft when you driving with your Mother, firm when you with your Mother-in-Law!!! Just my $0.02
