Drive Trainer Knowledge Base
Drive Trainer / Automatic Transmissions
 

Allison AT Series Proper Torque Specifications

DT#25013

Driver cover bolts
(540, 542, 542N, 545, 545N, 1500 series)
57-68 N•m 42-50 lb ft
Flexplate nuts 46-54 N•m 34-40 lb-ft
Transmission to engine bolts Tighten to vehicle manufacturer’s specifications  
Transmission to frame mounting bolts 220-260 N•m 164-192 lb ft
Output flange retaining bolt 138-164 N•m 102-121 lb ft
Companion flange or universal joints bolts Tighten to vehicle manufacturer’s specifications  
Manual selector valve nut 20-27 N•m 15-20 lb ft
PTO mounting bolts 35-43 N•m 26-32 lb ft
Modulator control retaining bolt 14-22 N•m 10-16 lb ft
Manual selector lever nut 20-27 N•m 15-20 lb ft
PTO mounting bolts 35-43 N•m 26-32 lb ft
Modulator control retaining bolt 14-22 N•m 10-16 lb ft
Parking brake mounting bolts 110-132 N•m 81-97 lb ft
Bellcrank and cable support brackets to transmission 57-67 N•m 42-49 lb ft
Hydraulic line fittings in transmission housing or retarder valve 20-30 N•m 15-22 lb ft
Primary cooler fittings in retarder valve body 54-68 N•m 40-50 lb ft
Fill tube fitting 88-102 N•m
w/ 0.675” long oil pan boss:
122-136 N•m
65-75 lb ft
w/ 0.675” long oil pan boss: 90-100 lb ft
Drain plug 20-27 N•m 15-20 lb ft
Speedometer driven gear assembly to rear cover 61-68 N•m 45-50 lb ft
Neutral start switch to transmission housing 68-81 N•m 50-60 lb ft
Reverse signal switch to transmission housing 5-7 N•m 4-5 lb ft
Modulator retaining bolt 14-21 N•m 10-16 lb ft
Retarder low speed cutoff switch in transmission housing 5-7 N•m 4-5 lb ft
Retarder temperature sensor fitting in retarder valve body 22-27 N•m 15-20 lb ft
Retarder main pressure sensor fitting in transmission housing & in retarder valve body 4-25 N•m 4-5 lb ft