One thing I should point out for those not familiar with spyntech dually hub, in this picture:
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The inner set of bolts you see with the lock washer and nut is strictly for holding the rotor in place. The rotor goes on from the back. The hub is one solid piece, no dually adapters, wheel is in the same position as factory. The front studs are wheel studs, exactly same as factory and reuses the factory bolts and torque specs.
A tip for those doing their own work .....
If you have to service the U-Joint for the front axle, its easy, do not have to take the whole thing apart. Remove the locker cover/handle, leave the C clip on the hub and locker itself. If you installed a c clip on the shaft, remove it. Align and strap a transmission jack to the hub assembly and lock it into place. Remove the caliper, caliber retainer bracket and pads, remove the 4 bolts on the back used to hold the spindle, disconnect ABS sensor cable from the frame plug and slide the assembly outward. The transmission jack will keep it aligned, stable, and pressure on your back ! Service your axle u-joint and reassemble in reverse .....
Also for installing for the first time, that hub is very heavy with the rotor attached. A transmission jack from Harbor Freight does wonders for assembling this quickly and easily.
BTW, arrow craft is the maker of that spacer (
Welcome - Arrowcraft :: Helping You Handle the Road for over 30 years!) ... . Would like to know also if Dynatrac is supplying those now or you still have to get them yourself.
Cheers.