RD = Rigid A = Adj F = Front C = Centre R = Rear I = Intermediate
Torque Arm Centres
16
Single Application
STD
SMT 16L-1A-7 406 RD 21206256
406 A 19206144
SMT 16/3L-1A-7 360 RD 21206142
360 A 19206146
U/SLUNG
SMT 16L-1-10AU 381 RD 21206135
381 A 19206146
SMT 16/3L-1A-10AU 337 RD 21206141
337 A 19206145
STD
SMT LL17-1A-7 337 RD 21206141
337 A 19206145
Suspension Series Centres Part Number
STD
SMT 20S, SMT 20L, SMT LL20, 464 RD 21205839
SMT 20HDL, SMT 22S, SMT 22L, 464 A 19206039
SMT 22HDL, SMT 22/3L &
SMT LL22HD-1A-7, SMT 27HD,
SMT 27HDL-1A-7
U/SLUNG
SMT 20S, SMT 20L, SMT 20HDL, 438 RD 21206140
SMT 22S, SMT 22L, SMT 22HDL, 438 A 19206144
SMT 22/3L, SMT 27HD &
SMT 27HDL-1A-10AU
U/SLUNG SPECIAL
SMT 22/3L-1A-10US 438 RD 21206140
438 A 19206144
Suspension Series Centres Part Number
Tandem Application
STD SMT 32
SMT 32L-2A-7 (1245 Axle Spread) 406 RD 21206256
406 A 19206144
SMT 32/3L-2A-7 (1145 Axle Spread) 360 RD 21206142
360 A 19206146
U/SLUNG SMT 32
SMT 32L-2A-10AU (1245 Axle Spread) 381 RD 21206135
381 A 19206146
SMT 32/3L-2A-10AU (1145 Axle Spread) 337 RD 21206141
337 A 19206145
STD LL 1080 AXLE SPREAD
SMT LL34-2A-7 337 RD 21206141
337 A 19206145
STD 1360 AXLE SPREAD
SMT 36S, SMT 36L, SMT LL36, 464 R 21205839
SMT 36HDL, SMT 44S, SMT 44L, 464 A 19206039
SMT 44/3L, SMT 44HDL,
SMT LL44HD, SMT 50HDL,
SMT 60HD & SMT 60HDL-2A-7
STD 1100 AXLE SPREAD
SMT 44HD-2A-7 360 RD 21206142
360 A 19206146
Suspension Series Centres Part Number
STD 1200 AXLE SPREAD
SMT 44HD-2A-7 381 RD 21206135
381 A 19206146
U/SLUNG 1360 AXLE SPREAD
SMT 36S, SMT 36L, SMT 36HDL, 438 RD 21206140
SMT 44S, SMT 44L, SMT 44L/3L, 438 A 19206144
SMT 44HDL-2A-10AU, SMT 50HDL,
SMT 60HD & SMT 60HDL-1A-10AU
U/SLUNG SPECIAL 1360 AXLE SPREAD
SMT 44/3L-2A-10US F-438 RD 21206140
A 19206144
R-530 A only 19206143
STD 1525 AXLE SPREAD
SMT 42L, SMT 42HDL, F-464 RD 21205839
SMT 42S, SMT 42/3L-2A-7 A 19206039
R-549 RD 21206138
A 19206143
U/SLUNG 1525 AXLE SPREAD
SMT 42L, SMT 42HDL, F-438 RD 21206140
SMT 42S, SMT 42/3L-2A-10AU A 19206144
R-508 A only 19206143
Suspension Series Centres Part Number
The torque arm centres quoted in the tables are for level or normal trailer slopes with a maximum ride height of 451mm on the forward axle. If this ride height is exceeded on the
forward axle together with a trailer slope greater than 1° in the unladen condition it will be necessary to increase the centres of the front torque arm. To retain axle centres quoted if no
rigid available use adjustable torque arms both sides. This will also retain the leaf spring in its correct position when installed. If in doubt consult MERITOR Product Design Department.
