2023 Peterbilt 579 — Wiper Blade Sizes

Quick reference

Position	Length (in)	Length (mm)	Attachment	OEM PN
Driver	26	660	J‑hook (9×4 mm common)	Verify with VIN — varies by build
Passenger	26	660	J‑hook (9×4 mm common)	Verify with VIN — varies by build
Rear (if equipped)	—	—	—	—

Note: Most 2023 Peterbilt 579 tractors are not equipped with a rear wiper. Blade length and arm style can vary by windshield/arm supplier; confirm on-vehicle before purchase.

Best aftermarket replacements

These premium beam blades fit standard J‑hook arms and are widely available. Choose 26 in for both driver and passenger on most 579 builds.

• Bosch ICON (beam): $$$ — Excellent longevity and winter performance.
• Rain‑X Latitude (beam): $$ — Good all‑season wipe, value‑priced.
• Trico Force (beam): $$–$$$ — Aerodynamic spoiler design for highway speeds.
• Michelin Stealth Ultra (hybrid): $$ — Durable hybrid frame resists lift.
• PIAA Si‑Tech (silicone beam): $$$ — Silicone coating promotes water beading.

Tip: Many fleets spec the same length on both sides. If your arm style differs (e.g., side pin), select the version/adapter that matches your attachment.

Attachment style

The 2023 Peterbilt 579 most commonly uses a J‑hook arm (9×4 mm; some may be 9×3 mm). However, fleet builds can vary. Here’s how to identify yours:

• J‑hook: Curved hook at the end of the arm; the blade’s adapter slides up into the hook until it clicks. Most consumer beam blades include a J‑hook adapter by default.
• Side pin: A small horizontal pin passes through the blade adapter. Requires a side‑pin adapter (often included in multi‑fit kits).
• Bayonet/push‑button: Straight bar or a button latch; use the matching adapter supplied with the blade.

If the adapter in the box doesn’t match your arm, check the brand’s included multi‑adapter kit or choose the heavy‑duty variant for commercial arms.

How to install

1. Park safely and key off. Set the parking brake. If equipped, place wiper switch in “off” so they don’t sweep on restart.
2. Lift one wiper arm off the glass. Support it to avoid snapping back onto the windshield.
3. Release the old blade:

• J‑hook: Press the locking tab on the blade adapter and slide the blade down toward the arm’s open end to unhook.
• Side pin or bayonet/push‑button: Depress the tab or button and slide the blade off per the adapter diagram.

4. Attach the new blade using the correct adapter. For J‑hook, slide the arm hook into the adapter until it locks with an audible click.
5. Gently lower the arm to the glass. Repeat for the other side.
6. Test with washer fluid. Confirm full sweep and no interference at park.

Note: If your 579 uses a less common side‑pin or fleet‑specific arm, consult the blade’s instruction sheet for the correct adapter orientation.

When to replace

• Interval: Every 6–12 months for most highway tractors, or sooner in harsh weather.
• Symptoms: Streaking, chattering, skipping, squeaking, or frayed rubber edges.
• Visual cues: Cracks, splitting, or a hard/glazed edge indicate the squeegee has aged.

Fresh blades improve wet‑weather visibility and reduce driver fatigue on long pulls.

Need wipers swapped fast? Find a shop on Repairius.