Why BK Racing Limited Slip Blocks Outperform a Welded Differential in Dirt Racing

For years, dirt track racers welded differentials because it was cheap, simple, and guaranteed both tires would drive. But as front wheel drive dirt racing evolved, racers started realizing a welded differential creates as many handling problems as it solves.

That is where the BK Racing Traction Block changes the game.

Unlike a welded differential that permanently locks both axles together, the BK Racing Limited Slip allows controlled differential action while still transferring power to both drive tires. The result is improved corner rotation, smoother power delivery, and dramatically better drive off the corner.

What a Limited Slip Differential Does

A limited-slip differential is designed to let the drive wheels turn at different speeds when cornering, while still sending power where it is needed.

Instead of acting like an open differential or a fully locked setup, it can receive more torque on the wheel with traction, which helps the car keep moving forward when one tire starts to slip.

The Problem with a Welded Differential

A welded differential forces both tires to rotate at the same speed at all times — even while cornering.

This creates several major problems on dirt tracks:

• Excessive push entering the corner
• Tight or bound-up steering feel
• Increased tire scrub
• More drivetrain shock
• Unpredictable handling on slick tracks
• Increased torque steer in FWD applications

While a welded differential can feel aggressive initially, it often sacrifices drivability and corner speed.

Why a BK Racing Traction Block Works Better

The BK Racing Limited Slip progressively transfers power to both drive wheels instead of violently locking them together.

This creates major advantages:

Better Corner Entry

The car rotates easier entering the corner instead of plowing the nose across the track.

More Drive Off the Corner

When throttle is applied, the BK Racing Traction Block smoothly engages both tires for better forward bite and acceleration.

That means:

• Less inside tire spin
• Better traction
• Smoother throttle application
• More usable forward drive

If you are getting beat on corner exit… there is a good chance they are running a BK Racing Traction Block.

Reduced Tire Wear

A welded differential constantly drags the tires against each other in the corner.

The BK Racing Limited Slip reduces unnecessary tire scrub while still maintaining strong traction.

Less Drivetrain Shock

Instead of shocking the axles and transmission with a harsh locked differential, the BK Racing Traction Block provides smoother progressive engagement.

This helps improve durability while keeping both tires working together.

Why This Matters on Dirt

Dirt tracks constantly change throughout the night.

A welded differential may work on a heavy track, but once the surface slicks off, the car often becomes:

• Tight center
• Hard to rotate
• Unstable on throttle
• Difficult to drive consistently

The BK Racing Limited Slip adapts much better to changing track conditions by allowing controlled wheel speed difference while still putting power to both tires.

Built for Racers

Unlike cheap generic limited-slip blocks, BK Racing Traction Blocks are designed specifically for racing applications.

Our progressive spring design creates smoother engagement while maintaining aggressive forward bite under acceleration.

The result:

• Better drivability
• Improved corner exit traction
• Reduced torque steer
• More predictable handling
• Faster lap times

What is the purpose of a limited slip?

The purpose of a limited slip is to help both drive wheels stay productive when one tire starts to lose grip. It sends power to the wheel with traction instead of letting the slipping tire waste it, which improves acceleration and control.

The Bottom Line

A welded differential is simply locked.

A BK Racing Traction Block is controlled traction.

If your goal is:

• Better handling
• Improved corner speed
• More forward bite
• Reduced push
• Better tire life
• Faster lap times

…then the BK Racing Traction Block is the smarter solution for modern dirt track racing.