To 2001 - "Z" Spring - Standard Ride Height - Tractor
Rear - Air Suspensions
Models with "Z" spring support member
Early versions of these springs were 1 5/16" or 1 3/8" thick
Standard ride height applications
Transtar (1978-84)
S - Series except low profile applications (1978-88)
2000, 4000 and 7000 Series tractor applications (1989-2001)
8100 Except car haulers with 5 1/4" ride height (1989-2001)
8200 through 9900 (1981-2001)