59 Inch Springs - 2004-06 - 12,000 Through 14,600 Axles
T600A and T600B; T800 and T800B (2004-2022)
These models changed from 64" to 59" springs in late 2004
T440 and T470 (2010-2022)
T660 (2006-2016)
T680 (2012-2022)
T880 except T880S (2013-2022)
All of these models used 59" springs
59" long springs; First design (OEM numbers beginning with "HK")
First design springs were generally used only from 2004 to 2006
12,000 lb through 14,600 lb axles only
All springs use a 1.75" diameter eye
For increased durability, conversion to threaded bushings and pins is an option
With TB-77, use 327-540 in place of RB-295