Can mismatched tires really destroy your all-wheel drive system? The short answer: yes — and it happens more often than drivers realize.

In this episode of the Bumper to Bumper Podcast, automotive experts Dave Riccio and John Riggle explain how replacing only one or two tires on an all-wheel drive (AWD) vehicle can lead to serious and expensive damage to the transfer case. Using real shop examples, they break down how tire circumference, tread wear, and tire brands affect AWD systems — and why even small differences can cause vibrations, noises, and drivetrain failure.

You’ll learn:

• How all-wheel drive systems work (full-time vs part-time AWD)

• Why replacing fewer than four tires can damage a transfer case

• How tire circumference differences stress driveline components

• Common symptoms of transfer case failure

• Proper AWD tire replacement and maintenance tips

• How often transfer case fluid should be serviced

If you own an AWD vehicle — including popular SUVs like the Ford Explorer, Subaru, or Land Rover — this episode is essential listening before your next tire purchase.