UCF trusses are cut from 1/2" steel plate. There are two kinds. Link trusses give the upper links of a custom link suspension a solid mounting platform. Front trusses stiffen a factory front axle housing. Find your axle below.
Link trusses: which one fits my axle?
These tie into the axle tubes and, on all but the 14 Bolt, a UCF diff cover, so you never weld to the cast center section.
| Axle | Link platform | Platform height | Max tube size | Diff cover |
|---|---|---|---|---|
| Dana 35 rear | 4" x 10" | 6" | 2.66" | Included |
| Dana 44 rear | 4 1/2" x 10" | 6" | 3.16" | Included |
| Ford 8.8" rear | 4 1/2" x 10" | 6 1/2" | 3.38" | Included |
| Dana 60 rear | 5" x 10" | 6 7/8" | 3.13" | Included |
| Dana 70 rear | 5" x 10" | 6 7/8" | 3.50" | Included |
| Ford Sterling 10.25"/10.5" rear | 4 1/2" x 10" | 7 1/4" | 3.52" | Included |
| GM 14 Bolt full floater | 4 1/2" x 13 1/2" | 6 3/8" | 3.50" | Not used. Bolts to the pinion support instead. |
| Chevy/GM Dana 60 front, with ram mount | 4 1/8" x 20 1/2" | 6 7/8" | 3.17" | Included |
| Ford Dana 60 front, with ram mount | 4 1/8" x 20 1/2" | 6 7/8" | 3.29" | Included |
Platform height is measured from the axle tube centerline. The two Dana 60 front trusses also carry a 6 1/4" x 13 1/4" platform for a double-ended steering ram.
Front trusses: stiffen a factory axle
The High-Pinion Dana 30 Front Truss fits the factory high-pinion Dana 30 from the '84–'99 Cherokee XJ and '86–'92 Comanche MJ, including one swapped into a TJ or LJ. It comes with a new passenger-side upper link mount and weighs 16 lb. It does not fit the low-pinion Dana 30 under a stock TJ, LJ, YJ, ZJ, WJ or 2000–2001 XJ. To tell them apart, look at where the driveshaft meets the axle: a high-pinion sits above the axle centerline, a low-pinion below it.
The JK Dana 44 Rubicon Front Truss fits '07–'18 JK and JKU Rubicons. It stiffens the long passenger-side tube, reinforces the factory passenger upper link mount and weighs 18 lb.
Do I have to weld it?
Yes. Every truss welds to the axle tubes, and the front trusses also need some cutting. On the link trusses, you weld the included tab to the diff cover, install the cover, set the truss on the tubes, bolt it to the cover and weld it to the tubes.
Will it fit my axle tubes?
Each link truss has saddles cut for the tube size in the chart. Measure your tubes before ordering, especially on swapped or aftermarket axles. Some grinding may be needed on K30 tubes.
Can I buy a truss without the cover?
No. On the trusses that use a cover, the cover is part of the truss: the tab welds to it and the truss bolts to it.
What's included?
Link trusses come with the truss body, the UCF diff cover with its weld-on tab, the cover hardware, and the 1/2" bolts and nuts that join the truss to the cover. The 14 Bolt truss comes with a removable pinion support bracket and its five 1/2" bolts; it reuses the factory pinion support bolts, so check that they're long enough. The front trusses come without hardware. Everything ships as bare steel.
Just need a steering ram mount?
For a Dana 60 that doesn't need a truss, there's the Dana 60 Double-Ended Steering Ram Mount and the Dana 60 Assist Ram Mount.
Install guides
Rear Truss System (PDF), 14 Bolt Truss (PDF), Ram Mount Truss System (PDF), Front Truss System (PDF) and Differential Cover (PDF).