By: Terry L. Howe - 2/2000

Trying to find the right show for your modified Jeep is not easy. These Rancho RS900 shock specs will help make the shock selection process a true science. The first table is a table of RS9000 shock specifications with extended length and collapsed length. The upper and lower mount codes are explained in a table below.

When you pick shocks for you vehicle, the shock should not limit compression. If the shock limits compression, eventually, it will break or the shock mount will break. Bump stops should be used to limit up travel. Pick the longest shock possible that has a collapsed length that is less than the length of the shock at full compression.

Model Extended Length Collapsed Length Upper Mount Lower Mount RS9001 21.43 13.20 ES31 ES24 RS9005 29.30 17.22 ES27 EB4 RS9006 18.31 11.66 EB1 EB1 RS9008 22.36 13.68 EB1 EB1 RS9009 26.78 15.67 S1 ES25 RS9010 26.69 15.84 EB1 EB1 RS9012 32.91 18.94 EB1 EB1 RS9014 25.21 14.67 S1 S1 RS9017 25.79 15.13 S1 ES25 RS9019 14.80 9.67 S1 EB1 RS9112 26.65 15.94 EB1 EB1 RS9113 20.65 12.82 EB1 EB1 RS9114 24.92 15.10 EB4 EB4 RS9115 21.24 12.92 S1 EB1 RS9116 24.40 14.79 EB1 EB1 RS9117 19.30 11.92 S1 EB1 RS9118 22.80 13.94 EB1 EB1 RS9119 18.39 11.68 EB1 EB1 RS9120 14.38 9.70 EB1 EB1 RS9123 18.39 11.68 EB1 EB1 RS9124 24.40 14.79 BP8 EB1 RS9125 22.83 13.97 EB1 EB1 RS9126 26.82 15.97 EB1 EB1 RS9128 21.09 12.77 S1 BP7 RS9129 20.49 12.73 BP18 EB1 RS9136 17.65 11.10 S1 EB1 RS9138 21.20 12.88 S1 EB1 RS9143 25.67 15.47 EB2 EB2 RS9144 22.55 14.00 EB2 EB2 RS9145 13.99 9.31 S1 ES113 RS9151 19.17 12.07 ES31 ES24 RS9152 18.39 11.68 ES76 ES82 RS9155 18.39 11.68 EB1 EB1 RS9156 12.24 8.40 S1 BP8 RS9157 21.91 13.34 EB2 S1 RS9158 21.35 13.03 S1 EB2 RS9159 21.66 12.79 S2 S2 RS9165 22.87 13.85 EB1 EB1 RS9166 14.34 9.54 S1 BP7 RS9168 25.90 15.24 S1 ES25 RS9179 22.95 13.95 S1 EB1 RS9180 21.76 13.53 EB2 EB2 RS9185 26.82 15.97 BP8 EB1 RS9186 21.02 12.79 S20 EB1 RS9187 21.17 12.94 S1 EB2 RS9188 12.24 8.40 S1 EB1

"ES" Mounting Code

Shocks with an ES mounting code have an eyering and bushing with a steel sleeve. The steel sleeve will determine the length of the bolt needed to pass through the mount and the diameter will be the size of the bolt. Unless otherwise specified, the dimentions are in inches.

Code Diameter Length ES2 10MM 1.42 ES10 7/16 1.38 ES17 12MM 1.25 ES18 12MM 1.65 ES23 1/2 1.31 ES24 1/2 1.38 ES25 1/2 1.50 ES27 1/2 1.62 ES31 1/2 2.25 ES34 9/16 1.66 ES36 3/4 1.75 ES53 10MM 1.38 ES55 12MM 1.56 ES65 12MM 1.38 ES76 12MM 2.44 ES82 1/2 1.67 ES84 10MM 1.62 ES91 1/2 2.10 ES110 16MM 1.61 ES113 16MM 1.49 ES124 16MM 2.28 ES153 7/16 1.50

"S" Mounting Code

Shocks with an S mounting code have stud mount. Jeep Wranglers, for instance, use a shock with a stud on top and an eyering on the bottom. In the table, the A column is the total length of the stud compressed, the B column is the length of the unthreaded portion of the stud, the C column is the diameter of the unthreaded portion of the stud, and the D column is the thread size. All dimentions are in inches except the thread size which is in inches with the pitch.

Code A B C D S1 2.37 0.88 3/8 3/8-24 S2 2.18 1.03 3/8 3/8-24 S6 2.59 1.48 7/16 3/8-24 S20 2.68 1.38 3/8 3/8-24

"EB" Mounting Code

Shocks with an ES mounting code have an eyering and bushing. In the table, the A column is the inside diameter of the bushing, the B column is the width of the bushing, and the C column is the compressed width of the bushing. All dimentions are in inches.

Code A B C EB1 5/8 1.44 1.25 EB2 3/4 1.62 EB4 11/16 1.72 1.55

"BP" Mounting Code

Shocks with an BP mounting code have an eyering and bushing with a bar pin through the bushing. In the table, the A column is the length of the bar pin, the B column is the length on center of the bar pin mount bolts or studs, and the C column is diameter of the bar pin mount bolts or studs. All dimentions are in inches.

Code A B C BP7 3.13 2.50 0.35 BP8 3.50 2.87 0.35 BP18 3.78 3.14 0.39

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