Experience a smoother ride and better cab alignment with the ATRO KT75-61257. Specifically engineered for Peterbilt Unibilt systems, this kit replaces high-wear rubber mounts with ATRO’s world-class polyurethane. Designed to absorb road vibration and resist the oil, grease, and environmental ozone that cause standard rubber mounts to crack and sag, this kit is the definitive "fix-it-once" solution for your Peterbilt.
| Attribute | Detail |
| Part Number | KT75-61257 |
| Category | Underhood / Cab |
| UPC Code | 751354027969 |
| Shipping Weight | 2.185 lbs |
| Bushing Height | 1 1/8" |
| Inside Diameter | 21/32" |
| Large Outside Diameter | 3" (Bushing) |
| Small Outside Diameter | 1 13/16" (Nipple) |
| Qty Per Vehicle | 2 |
Unlike many "bushing-only" options, this ATRO kit includes the necessary hardware to ensure a secure, professional installation:
(2) CM75-61257 Polyurethane Mounts
(1) Inner Steel Sleeve
(1) 16MM High-Strength Bolt
(1) 16MM Locknut
(2) Precision Flat Washers
This kit is optimized for Peterbilt Unibilt cab and sleeper mounting systems across the following legendary models:
Peterbilt: 357, 365, 378, 379, 385, 389
| Manufacturer | Part Number | Notes |
| Peterbilt | 20-08257 | Main Mount Assembly |
| Peterbilt | 20-08867 | Inner Sleeve |
| Gaff | 12360 | Near Cross (often lacks bolts) |
Standard rubber mounts are prone to "compression set," meaning they flatten over time and lose their ability to isolate the cab from chassis vibration. ATRO’s proprietary polyurethane maintains its memory, ensuring your cab height remains consistent and the ride stays quiet for years, not months.
Installation Note: This kit is a direct bolt-on for the Unibilt system. Replacing these in pairs is highly recommended to ensure even weight distribution and cab level.
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