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*The correct part for your application must be verified before ordering*
| Key | Part # | OEM Ref.Description |
| (1) | 75-129 | Peterbilt Rear Air Leaf Parabolic Leaf Spring, OEM# 307353 |
| (2) | BT75728 | Peterbilt Air Leaf Front of Rear Hanger, OEM# 306794 |
| (3) | BT2461 | Peterbilt Air Leaf Rear of Rear Hanger, OEM# 121518 |
| (4, a-d) | (a)BT001 (b)BT002 (c)BT003 (d)BT004 | Peterbilt Air Leaf, Air Trac Suspension Paddle- LH, OEM# 0302559L (40K)Peterbilt Air Leaf, Air Trac Suspension Paddle- RH, OEM# 0302559R (40K)Peterbilt Air Trac, Air Leaf Suspension Paddle- LH, OEM# 0306747L (46K)Peterbilt Air Trac, Air Leaf Suspension Paddle- RH, OEM# 0306747R (46K) |
| (5) | BT86157 | Peterbilt Axle Seat, OEM# 307168 |
| (6, a-b) | (a)BT09457 (b)BT10957 | Peterbilt U-Bolt Bottom Plate, OEM# 0304900Peterbilt U-Bolt Bottom Plate, OEM# 0304901 |
| (7) | 1R12-069 | 1R12-069 Goodyear Air Spring |
| (8) | BT85308 | Gabriel 85308 FleetLine Shock Absorber |
| (9) | BT85311 | Gabriel 85311 FleetLine Shock Absorber |
| (10, a-b) | (a)BT815 (b)BT155 | Peterbilt Torque Rod Forged 22.875″ OEM# 302439Peterbilt Torque Rod Sealed 22.810″ OEM# 304251 |
| (11) | BT4091 | Peterbilt Torque Rod Bracket HD Hendrickson, OEM# 302435 |
| (12, a-b) | (a)BT3981 (b)BT5981 | Peterbilt T-Rod Bracket, OEM# 308382Peterbilt T-Rod Bracket, OEM# 307182 |
| (13) | BT411 | Peterbilt Spring Roller Kit |
| (14) | BT8-1102SR | 1x4x16 Semi Round U-Bolt Kit |
| (15, a-b) | (a)BT8-1100S (b)BT8-1101S | 3/4x4x5-3/4 Square U-Bolt Kit3/4x4x6-3/4 Square U-Bolt Kit |
| (16) | BT173WA | Peterbilt Wear Washer, OEM# 307148 |
| (17, a-b) | (a)BT30AL1 (b)BT30AL1UB | Peterbilt Air Leaf Spring Eye Bushing Kit, OEM# 03AL1Peterbilt Air Leaf Spring Eye Poly Bushing Kit, OEM# 03AL1 |
| (18) | BT888 | Peterbilt U-Bolt Top Plate, OEM# 0301657 |
| (19) | BT228 | Peterbilt U-Bolt Top Plate, OEM# 301656 |
| (20) | BT37157 | Peterbilt Air Spring Stud |
| (21) | BT8654 | Peterbilt Center Bolt, Hex Head w/ Tab Special, OEM# 302583 |
| (22) | BT2043C | Flange Bolt 3/4″-10 x 2-1/4″ Grade 8, OEM# 2700286009 |
| (23) | BT461 | Peterbilt Air Leaf Eye Casting, OEM# 301654 |
Peterbilt Rear Air Leaf Springs
ATS Springs provides a complete selection of rear air leaf springs for Peterbilt trucks, designed to restore proper suspension performance and load handling. Our leaf springs are available in direct replacement OEM-spec configurations or heavy-duty upgrades for trucks carrying extra loads.
Features & Benefits:
- OEM Replacement Fit: Exact replacement for Peterbilt rear air leaf spring applications.
- Heavy-Duty Options: Increase weight capacity and improve stability for commercial or long-haul use.
- Durable Construction: Built to handle heavy loads and extended wear, ensuring reliable performance.
- Improved Ride Quality: Reduces sagging, enhances ride comfort, and maintains proper vehicle height under load.
- Easy Installation: Pre-assembled leaves and quality bushings for fast and secure installation.
Why Replace Rear Air Leaf Springs?
Rear air leaf springs can deteriorate over time due to road conditions, heavy loads, and normal wear. Replacement ensures:
- Correct ride height and suspension alignment
- Improved handling and load stability
- Extended life of other suspension components
- Safer operation under full load
Installation Notes:
- Inspect U-bolts, hangers, shackles, and bushings when replacing leaf springs.
- Always use Grade 8 hardware for secure installation.
- Follow recommended torque specifications to maintain performance and safety.
ATS Springs supports all Peterbilt rear air leaf spring needs with OEM-spec and heavy-duty options. If your application isn’t listed online, contact us and “Just Ask Bob” to find the right fit for your truck.