Kenworth T400, T440, T450, T470, T600, T660, T680, T800, T880 14.6-24k Axle 59" 2006+ Springs
4" width springs for 14,600 lb through 24,000 lb axles. Springs use 2.08" eyes. Second design (OEM numbers beginning with B81) were generally used starting in 2006.
| SRI | OEM |
A S.E. |
B L.E. |
Bushings | Capacity |
| 59-646 | B81-6045-001 | 27 1/4" | 32 3/16" | RB-308, RB-324 | 7,300 lb |
| 59-648 | B81-6045-002 | 27 1/4" | 32 3/16" | TB-81, TB-81 | 7,300 lb |
| 59-650 | B81-6045-003 | 27 1/4" | 32 3/16" | RB-308, RB-308 | 7,300 lb |
| 59-572 | B81-6016-001 | 27 3/8" | 32 3/16" | RB-308, RB-308 | 8,000 lb |
| 59-574 | B81-6016-002 | 27 3/8" | 32 3/16" | RB-308, RB-324 | 8,000 lb |
| 59-576 | B81-6016-003 | 27 3/8" | 32 3/16" | TB-81, TB-81 | 8,000 lb |
| 59-528 | B81-6018-001 | 27 1/4" | 32 3/16" | RB-308, RB-308 | 9-10,000 lb |
| 59-554 | B81-6018-002 | 27 1/4" | 32 3/16" | RB-308, RB-324 | 9-10,000 lb |
| 59-594 | B81-6018-003 | 27 1/4" | 32 3/16" | TB-81, TB-81 | 9-10,000 lb |
| 59-578 | B81-6022-001 | 27" | 32" | RB-308, RB-308 | 11-12,000 lb, 3 Stage |
| 59-580 | B81-6022-002 | 27" | 32" | RB-308, RB-324 | 11-12,000 lb, 3 Stage |
| 59-582 | B81-6022-003 | 27" | 32" | TB-81, TB-81 | 11-12,000 lb, 3 Stage |
| TXL-5910 | None | 28" | 33" | None | 2,200 lb |
| 59-600 | B81-6028-001 | 27 1/8" | 32 1/8" | RB-308, RB-324 | 11,500 lb, 2 Stage |
| 59-602 | B81-6028-002 | 27 1/8" | 32 1/8" | TB-81, TB-81 | 11,500 lb, 2 Stage |
| 59-604 | B81-6028-003 | 27 1/8" | 32 1/8" | RB-308, RB-308 | 11,500 lb, 2 Stage |
| 59-602HD | None | 27 1/8" | 32 1/8" | TB-81, TB-81 | 14,000 lb, 2 Stage |
Kenworth C500, K100, K300, W900, T300, T400, T450, T600, T800, T2000 Front Suspensions
RB-308: 7 1/2" L
RB-324: 6 11/16" L
Conversion to threaded bushings and pins is an option for increased durability.
In place of RB-308, use 327-540 pins with TB-81 bushings.
In place of RB-324, use 327-544 pins with TB-81 bushings.
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