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Gmc R1500 Alignment Caster / Camber Shims

Gmc R1500 Alignment caster / camber shims

Starting at $2.95, AutoBuffy stocks 8 alignment caster/camber shims from MOOG, ACDelco, and SKP to fit the Gmc R1500. These thin, precision-angled shims fit between the axle and suspension components to correct caster and camber angles. When they shift, wear, or go missing after suspension work, tires scrub unevenly, handling pulls to one side, and alignment specs can't be held within factory tolerance.

Signs your Gmc R1500 needs new alignment caster/camber shims

  • Steering pulls consistently to one side even on a flat, straight road
  • Uneven tire wear — one edge of a front tire wears faster than the other
  • Steering wheel sits off-center when driving straight ahead
  • Vehicle wanders or requires constant small corrections to stay in lane
  • Alignment shop reports camber or caster is out of spec and cannot be corrected by standard adjustment
  • Visible gap, rust, or a loose shim plate spotted during an inspection of the rear axle or control-arm mount area

Which alignment caster/camber shim should you buy for your Gmc R1500?

The right shim depends on two things: the degree of correction needed and whether it goes on the front or rear axle. Shims are sold in fixed-degree increments (e.g., 0.5°, 1°, 1.5°, 2°) as well as adjustable cam-bolt kits; choosing the wrong degree will push alignment further out of spec rather than correcting it. Always confirm your current alignment readout before ordering so you buy a shim that closes the gap to factory spec.

OEM-replacement fixed shim
Best for
Restoring factory spec after shim loss or damage
What you get
Exact original thickness and angle; bolt-in fit with no alignment guesswork
Aftermarket fixed-degree shim (single angle)
Best for
Budget correction when deviation is known and consistent
What you get
Steel or aluminum plate ground to a precise angle; sold individually or in pairs
Multi-angle shim kit (assorted degrees)
Best for
Shops or DIYers who want flexibility across different correction amounts
What you get
Set of several shim angles so you can dial in the closest match without ordering multiple times
Cam bolt / eccentric bolt kit
Best for
Vehicles where the mount slot allows rotational adjustment instead of a plate shim
What you get
Adjustable bolt that rotates within the mount to shift camber or caster continuously within a range, often ±1.5°–2°

Alignment caster / camber shims brands we stock for your Gmc R1500

MOOG
4 options · from $26.95
ACDelco
2 options · from $2.95
SKP
2 options · from $11.95

Replacing alignment caster/camber shims on a Gmc R1500

Moderate⏱ 1–3 hours (plus alignment time)Floor jack and jack standsBreaker bar and socket set (metric and SAE)Torque wrenchWire brush or rust penetrant for corroded hardwareAlignment gauge or access to an alignment machine for post-install verification

Raise and safely support the Gmc R1500, then locate the shim at the axle pad, control-arm bolt, or strut mount depending on the suspension design. Remove the fasteners securing the joint, slide out the worn or incorrect shim, and insert the new shim in the correct orientation — angle direction matters for whether you are correcting camber or caster. Reinstall and snug all fasteners to a proper specification, then take the vehicle to an alignment bay before returning it to regular use.

Frequently asked questions

How much does it cost to replace alignment caster/camber shims on a Gmc R1500?
Parts start at $2.95 for a single shim on the Gmc R1500. Labor at an alignment shop typically adds one to two hours of shop time because a full four-wheel alignment must be performed after installation to confirm the correction. Buying the correct degree shim the first time avoids a second alignment visit and additional cost.
Can I drive my Gmc R1500 with a missing or incorrect camber/caster shim?
Short distances are possible, but driving long-term without proper shims causes accelerated and uneven tire wear, degrades straight-line stability, and stresses wheel bearings and ball joints due to off-angle loading. The further out of spec the alignment is, the faster these secondary problems develop. Replace and re-align as soon as practical.
How do I know which degree shim my Gmc R1500 needs?
You need a printed alignment report showing current caster and camber readings versus factory spec. The difference between actual and target tells you the correction angle required. A shim degree that matches or slightly exceeds that gap is the correct choice. Without a current alignment printout, you are guessing and risk ordering the wrong part.
Are caster shims and camber shims the same part on a Gmc R1500?
They serve different purposes but can be the same physical wedge-shaped plate. Rotating or repositioning the shim changes whether it primarily affects camber (tire lean angle) or caster (steering axis tilt). Some applications use dedicated shims for each axis; others use one angled shim that corrects both simultaneously depending on orientation at installation.
Do I need an alignment after replacing shims on my Gmc R1500?
Yes — always. Installing a new shim physically changes the suspension geometry, so a full alignment check is mandatory afterward. Skipping it means you cannot confirm the correction actually brought the angles within spec. Most shops perform the alignment as part of the shim replacement job and include it in the quoted labor.
How long do alignment shims last on a Gmc R1500?
A quality steel or aluminum shim has no defined service interval and can last the life of the vehicle under normal conditions. They typically need replacement after collision damage, corrosion that distorts the plate, or when a prior repair shop omitted or misplaced them. Inspect shims any time rear suspension or axle components are removed.

Shop alignment caster / camber shims by year for the Gmc R1500

1987

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Alignment caster / camber shims for other Gmc models

Gmc C1500Gmc G25Gmc G25/G2500 VanGmc SafariGmc G35Gmc C3500