4x4 Truck Axle Tech - Axle 101
(In lb-ft, from published axle manufacturers' sources) | Axle | COT | MOT | | (lb-ft)* | (lb-ft)** | | AAM/GM 7.25 IFS | - | 2,333 | | AAM/GM 8.25 IFS | - | 3,581 | | AAM/GM 9.25 IFS | - | 4,643 | | AAM 9.25 Front | - | 4,663 | | AAM/GM 7.63 SF Rear | - | 3,165 | | AAM/GM 8.5/8.6 SF Rear | - | 3,829 | | AAM/GM 9.5 SF Rear | - | 4,993 | | AAM/GM 10.50 FF Rear | - | 6,242+ | | AAM/GM 11.50 FF Rear | - | 8,321+ | | Dana 28 TTB | 575 | 2,350 | | Dana 30 Front (all) | 640 | 2,350 | | Dana 35 TTB & IFS | 920 | 3,700 | | Dana 44 Beam & TTB | 1,100 | 3,460 | | Dana 50 Beam & TTB | 1,200 | 5,000 | | Dana 60 Front | 1,500 | 5,550 | | Dana 70 Front | 2,000 | 8,000 | | Dana 35 Rear | 870 | 3,480 | | Dana 44 Rear | 1,100 | 3,460 | | Dana 60, 61-SF Rear | 1,500 | 5,500 | | Dana 60, 61HD-FF Rear | 1,500 | 6,000 | | Dana 70, 70U Rear | 2,000 | 8,000 | | Dana 70 HD Rear | 2,000 | 8,800 | | Dana 80 rear | 2,500 | 10,000 | | Ford 8.8 IFS/IRS | 1,250 | 4,600 | | Ford 7.5 Rear | 870 | 3,230 | | Ford 8.8 (28spline) Rear | 1,250 | 4,600 | | Ford 8.8 (31spline) Rear | 1,360 | 5,100 | | Ford 9.75 SF Rear | 1,600 | 6,100 | | Ford 10.25 FF Rear | 2,000 | 8,300 | | Ford 10.50 FF Rear | 2,900 | 10,660 |
Notes
A "+" indicates that the manufacturer offers higher-rated versions.
*Continuous Output Torque
** Maximum Output Torque
(Ultimate strength [UTS] from destructive tests) | Spicer # | UTS (lb-ft) | Spicer (lb-ft) | | or Brand | | Yield | | | Strength | | 260X (D30) | 2,950 | NA | | 297X (D44) | 4,600 | 1,600 | | 760X (D44) | 5,400 | NA | | 627X (D50) | 4,890 | 2,260 | | 332X (D60) | 6,200 | 3,300 |
Note
Aftermarket super-strength U-joints like the CTM, the OX or the Yukon are at least two to three times stronger than OEM styles, but no exact test info is available as yet.
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