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Buddy
Reviewed in the United States on January 21, 2025
How to Correct Pinion Angle Safely and EffectivelyAfter dropping my truck, I experienced persistent vibration issues. The problem? The pinion angle was off. Instead of cutting off axle perches, I used a shim adjustment method, which allowed me to fix the angle within 1° of true. Here's a step-by-step guide to help others tackle this issue safely.Important Safety Reminders1. Always prioritize safety. Use jack stands or a secondary support system—never rely solely on a jack.2. Know your pinion angle. Determine whether your pinion angle needs a positive or negative adjustment. This will tell you whether the thicker end of the shim should face forward or backward.3. Seek professional help if you're unsure. If you're not confident in these steps, it's always better to consult a professional to avoid accidents or damage to your vehicle.Step-by-Step Instructions1. Loosen U-bolts: You don’t need to completely remove the U-bolts. Loosen them until the nuts are nearly off, but keep enough thread engagement to maintain some control. Both sides will need to be loosened.2. Check alignment stud size: Different vehicles have different leaf spring alignment stud diameters. For GM full-size trucks, you’ll likely need to slightly enlarge the shim opening. A 3/4" step bit worked well for me.3. Position the shim: Jack up the leaf spring just enough to slide the shim into place. Never place your fingers between the spring and axle during this step.4. Install the shim: Once the shim is positioned on one side, snug the U-bolts just enough to hold it in place. Move to the other side and repeat the process.5. Align everything evenly: Ensure the U-bolts are snugged down evenly so there isn’t excessive thread showing on one side compared to the other. Pay close attention to how everything lines up.6. Torque to spec: Once both shims are correctly positioned, torque all U-bolts to the manufacturer’s specifications.7. Check the angle: Set the vehicle on the ground and recheck the pinion angle. If the angle is worse or still off, repeat the steps, but rotate the shims 180° before reinstalling them.Correcting a pinion angle takes patience and precision. Always work methodically and never cut corners on safety. If you’re uncertain at any point, don’t hesitate to consult a professional mechanic—it’s worth it to avoid potential injury or further damage to your vehicle.
Slice
Reviewed in the United States on September 9, 2024
Someone rigged a rear and had 3 inch lifting blocks to compensate for collapse Springs. I guess they were just trying to sell the truck I bought new springs and my differential was not correctly lined so I used the shims see the picture it worked out well I did not have to buy, and it took maybe two hours with Jack and the truck up and unbolting everything I sprayed knocker loose on the bolts a week prior to my disassembly
josh
Reviewed in the United States on September 8, 2024
These don’t even come close to fitting a Tacoma. The hole diameter is way too big for the center pin.
Customer
Reviewed in Canada on August 1, 2024
Fits well and corrected my pinion angle issue. I did have to cut the center hole larger to fit my spring perches but they’re aluminum so they cut easy with a hole saw.
ZmaNn
Reviewed in the United States on November 27, 2024
Shims are nice. They don't fit a gene Tacoma factory center pin. The hole in the shims is ½" id
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