Kenworth T400, T440, T450, T470, T600, T660, T680, T800, T880 12-14.6k Axle 59" 2004-06 Springs
4" Width, 1.75" diameter eyes; for 12,000 lb through 14,600 lb axles
First design springs (OEM numbers beginning with HK) were generally used only from 2004-2006.
| T600A, T600B, T800, T800B | 2004-06 |
| SRI | OEM |
A S.E. |
B L.E. |
Bushings | Capacity |
| 59-504 | HK48110-3200 | 27" | 32" | RB-295, RB-295 | 6,000 lb |
| 59-514 | HK48110-3210 | 27" | 32" | RB-295, RB-295 | 6,600 lb |
| TXL-5912 | None | 28" | 33" | None | 2,200 lb |
| 59-506 | HK48110-3220 | 27" | 32" | RB-295, RB-295 | 7,300 lb |
| TXL-5910 | None | 28" | 33" | None | 2,200 lb |
Kenworth C500, K100, K300, W900, T300, T400, T450, T600, T800, T2000 Front Suspensions
Conversion to threaded bushings and pins is an option for increased durability.
In place of RB-295, use 327-540 pins with TB-77 bushings.
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