59 Inch Springs - 2006-22 - 12,000 Through 14,600 Axles
59" Long springs; Second design (OEM numbers beginning with "B81")
Second design springs were generally used starting in 2006
These springs are part of the Paccar (Kenworth and Peterbilt) common chassis
These springs are also used by Peterbilt
12,000 lb through 14,600 lb axles only
Springs in the same OEM number series are the same except for the bushing
All springs except for B81-6045 series use 1.75" eyes; The B81-6045 series uses 2.08" eyes
See next section for additional springs that use the 2.08" diameter eye
RB-295 and RB-308: 7 1/2" long
RB-328 and RB-324: 6 11/16" long
For increased durability, conversion to threaded bushings and pins is an option
With TB-77, use 327-540 in place of RB-295 and 327-544 in place of RB-328
With TB-81, use 327-540 in place of RB-308 and 327-544 in place of RB-324