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Shock Measurement Guide

When ordering shocks for most vehicles, all you will need to do is enter your vehicle information into our shock finder and pick the best shock for your needs. Some vehicles do not have shocks built specifically for them, usually this is only the case with particularly rare vehicles or trim lines, or for custom applications. Vehicles with lowered or raised suspensions need different length shocks than a stock-height vehicle, and often there is not a shock built for the specific amount of lift or lowering your vehicle might have. In these cases, you will need to measure your vehicle to find the correct dimensions.

For lifted and lowered vehicles, there is often an easier way to find the correct shock for your vehicle than measuring the suspension. The best option, if you purchased a lift kit or lowering kit, is to contact the manufacturer of the kit and find out the recommended shock dimensions. If that is not possible, measuring the shocks that came packaged with your kit and finding a similarly sized shock will work.

How to Measure Shocks

A shock is measured by its extended and collapsed lengths, and is measured from the center of the loop mount or the base of the stud mount. To get the extended length of a shock, remove it from the vehicle and allow it to expand on its own or pull it to the fully extended position and take a measurement. To get the collapsed length of a shock, compress it by hand or by using a strap and take a measurement. With the expanded and collapsed lengths of your current shocks, you will be able to find a suitable shock for your custom application.

How to Measure a Shock Absorber

This shock has a length of approximately 25 inches.

How to Measure a Shock Absorber

This shock has a length of approximately 16 inches because the measurement is taken to the base of the mount, where the threading starts.

How to Measure a Vehicle for Shocks

Measuring your vehicle for shocks is a last resort if none of the other ways of finding a proper replacement shocks is available. To find the correct measurement for a shock absorber, you will need to measure from the center of a loop style mount and from the closest point on the mount for a stud type shock (since the shock is measured from the base of the stud, not the tip). To get the collapsed length measurement for your vehicle, you will need to compress your suspension fully. To do this, you can drive up a ramp with one side of the vehicle until the suspension is fully compressed or put a jack under one wheel to compress it *THIS CAN BE EXTREMELY DANGEROUS AND SHOULD ONLY BE DONE BY A COMPETANT, EXPERIENCED MECHANIC WITH A FULL ARRAY OF SAFETY EQUIPMENT. IF YOU ARE UNSURE IN ANY WAY ABOUT HOW TO PROPERLY JACK AND SECURE A VEHICLE, BRING IT TO A MECHANIC.* When looking for a shock, subtract half an inch from the compressed length to allow for bump stop compression.

To get the extended length of your suspension, you will need to jack and secure your vehicle and allow the suspension to drop. Jack the vehicle up until the wheel is off the ground, then lower it so the tire is just on the ground. Take a measurement with the suspension at this point. If your vehicle currently has shocks on it, you will need to remove them before measuring, as the shock could limit the suspension travel.

Once you have determined the correct size for your shocks, find one that is as close as possible to your measurements using one of the guides at the bottom of this page. Keep in mind that you may not find a shock that fits your vehicle exactly and that, if available, more travel (a shorter collapsed length and longer extended length) is preferable.

If you are looking for a replacement shock for a unique vehicle, be aware that it is very important to match the mounting points exactly between your vehicle and the shock absorber. A shock that does not fit correctly could have a reduced life or cause improper and dangerous handling characteristics.

Shock Lengths

Monroe Shock Lengths
KYB Shock Lengths

Off Road Shock Lengths
Bilstein 5125 Off Road Shocks
Bilstein 5150 External Reservoir Off Road Shocks
Bilstein 5165 Series Remote Reservoir Off Road Shocks



Mount codes

Often, the description of the type of upper and lower mounts on a shock are only listed by the manufacturer code for the mount. Below you will find a list of values to identify what each code means.

FOX MOUNTING CONFIGURATION TABLE
Stem Bushing Mount
    SM1.500 Stem Mount Kit, Tall Bushing, Long Stem (2.0 Factory Series)
SM2.500 Stem Mount Kit, Short Buhsing, Long Stem w/ Spacer
SM3.500 Stem Mount Kit, Short Bushing, Short Stem (2.0 Performance Series)
Stem Mount w/ No Bushing
S1Short Stem: [1/2-20 Thread, 3.050 TLG]
S2Long Stem: [1/2-20 Thread, 3.350 TLG]
Eyelet Bushing Mount
EB1Hourglass Bushing: 0.750 Inner Diameter x 1.300 TLG
EB2Hourglass Bushing: 0.625 Inner Diameter x 1.300 TLG
EB3Hourglass Bushing: 0.625 Inner Diameter x 1.460 TLG
EB4Hourglass Bushing: 0.750 Inner Diameter x 1.460 TLG
Eyelet Sleeve Mount
ES1Sleeve: 0.478 Inner Diameter X 0.625 Outer Diameter X 1.500 TLG
ES2Sleeve: 0.506 Inner Diameter X 0.625 Outer Diameter X 1.375 TLG
ES3Sleeve: 0.506 Inner Diameter X 0.625 Outer Diameter X 1.480 TLG
ES4Sleeve: 0.482 Inner Diameter X 0.625 Outer Diameter X 1.545 TLG
ES5Sleeve: 0.478 Inner Diameter X 0.625 Outer Diameter X 1.250 TLG
ES6Sleeve: 0.478 Inner Diameter X 0.625 Outer Diameter X 1.750 TLG
ES7Sleeve: 0.478 Inner Diameter X 0.625 Outer Diameter X 1.438 TLG
ES8Sleeve: 0.478 Inner Diameter X 0.625 Outer Diameter X 2.045 TLG
ES6Sleeve: 0.560 Inner Diameter X 0.750 Outer Diameter X 1.625 TLG
ES7Sleeve: 0.560 Inner Diameter X 0.750 Outer Diameter X 1.675 TLG
ES8Sleeve: 0.560 Inner Diameter X 0.750 Outer Diameter X 1.313 TLG
ES9Sleeve: 0.560 Inner Diameter X 0.750 Outer Diameter X 1.880 TLG
ES10Sleeve: 0.630 Inner Diameter X 0.750 Outer Diameter X 2.280 TLG
ES11Sleeve: 0.630 Inner Diameter X 0.750 Outer Diameter X 1.375 TLG
ES12Sleeve: 0.510 Inner Diameter X 0.750 Outer Diameter X 1.490 TLG
ES13Sleeve: 0.560 Inner Diameter X 0.750 Outer Diameter X 1.550 TLG
ES14Sleeve: 0.560 Inner Diameter X 0.750 Outer Diameter X 2.045 TLG
Bar Pin Mount
BP1Bar Pin: 3.100 TLG X 0.635 Outer Diameter X 2.818 Bolt Hole Span
BP2Bar Pin: 3.750 TLG X 0.635 Outer Diameter X 3.515 Bolt Hole Span
BP3Bar Pin: 3.250 TLG X 0.635 Outer Diameter X 3.060 Bolt Hole Span
BP4Bar Pin: 3.875 TLG X 0.635 Outer Diameter X 3.736 Bolt Hole Span
BP5Bar Pin: 3.875 TLG X 0.635 Outer Diameter X 3.736 Bolt Hole Span
BP5Bar Pin: 4.750 TLG X 0.760 Outer Diameter X 3.780 Bolt Hole Span
BP6Bar Pin: 4.750 TLG X 0.625 Outer Diameter X 3.938 Bolt Hole Span (-10 Heim)
BP7Bar Pin: 4.750 TLG X 0.750 Outer Diameter X 3.938 Bolt Hole Span (-12 Heim)
BP8Bar Pin: 3.875 TLG X 0.625 Outer Diameter X 3.341 Bolt Hole Span (-10 Heim)
Clevis Mount
C1Clevis: 1.750 W X 2.130 L x 0.575 Thru Bolt Hole (Performance Series)
C2Clevis: 1.390 W X 2.270 L x 0.590 Thru Bolt Hole (Factory Series)
C3Clevis: 1.390 W X 2.400 L x 0.580 Thru Bolt Hole (Performance Series)
C4Clevis: 2770 W X 2.050 L x 0.635 Thru Bolt Hole (Performance Series)
Eyelet Heim
SB1Spherical Bearing: -8, 0.500 Inner Diameter
SB2Spherical Bearing: -10, 0.625 Inner Diameter
SB3Spherical Bearing: -12, 0.750 Inner Diameter
SB4Spherical Bearing: -14, 0.875 Inner Diameter
SB5Spherical Bearing: -12, 0.750 Inner Diameter (2.0 Perfromance Series)
Taper Pin Mount
TP1Taper Pin: 4.845 TLG X 0.712 Outer Diameter
TP2Taper Pin: 4.050TLG X 0.625 Outer Diameter
OEM
TMOEM Truck Top Mount


KYB MOUNT DECODING
CodeDescription
IDInside diameter
ODOutside diameter
E1Eyering with 5/8" ID rubber bushing
E1 – L/ELarge eyering with rubber bushing. The (xxx) after L/E is the bushing ID.
E2Eyering with bushing and metal sleeve The (xxx) after E2 are the sleeve dimensions. Example: (12 x 32) = 12mm ID x 32mm wide
E3Eyering with slotted barpin The (xxx) after E3 is the barpin slot dimensions & rotation. Example: (48 x 80 x 0) = 48mm from slot ID to slot ID, 80mm barpin OD, with 0 degrees rotation. (means barpin is perpendicular to shock body)
S1Standard 3/8" / 10mm OD stem (bayonet) mount
S1(xxx)Stem with special dimension Example: S1(12mm) = 12mm OD stem
S-BRKTSpecial bracket with studs
SpecialSpecial mount configuration
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