Most of us are familiar with the IFS Hilux front hub conversion to gain an extra 3" of axle width on our cruiser front axle. Aseif007 and I have been discussing how to narrow a late/US model 80 series rear axle to get it to match his front 60 series axle width. So I am posting this to share my findings so far.
The rear hubs between the factory full floater disc brake axle in the 70 series and in the 80 series have the same width and use the same bearings. These bearings are located at the same points along the axis. While I haven't tried putting bearings in the hubs and cross installing them, I guess they would fit (80 hub to 70 axle, 70 hub to 80 axle).
The wheel mounting surfaces are located at different points along the hubs, however. The 80 hub has its mounting surface 30mm farther out than the 70 hub.
The brake rotors also differ such that the discs are located at the same location along the spindle.
We know the rear calipers are identical, I am using rebuilt 80 series rear calipers on mine. But I am still not 100% sure whether the swap would be possible as there are some questions remaining. For instance, why is it possible to use a 15" wheel in a disc braked 70 and not on a late/US model 80? Is it possible that the discs are larger that the calipers are placed further out? I have discs and backing plates on hand to compare, but the rain is keeping me out of my parts shed (on rainy days the door stays shut to keep any moisture out
)
The late 80 series has a rear disc diameter of 336mm where as the 70 series is at 312mm (as it is the 90-92 80 series rear discs). The bolt pattern on the backing plate where it mounts to the axle housing seems identical save for a tube for ABS sensor on the US 80. Does the backing plate place the caliper further out on the late 80? Would a backing plate swap be necessary too?
I suppose there are two possibilities, the swap will require a swap of the backing plates as well as the hubs and rotors, or, a simple swap of the rotors and hubs would be sufficient. Stay tuned.
Dave
The rear hubs between the factory full floater disc brake axle in the 70 series and in the 80 series have the same width and use the same bearings. These bearings are located at the same points along the axis. While I haven't tried putting bearings in the hubs and cross installing them, I guess they would fit (80 hub to 70 axle, 70 hub to 80 axle).
The wheel mounting surfaces are located at different points along the hubs, however. The 80 hub has its mounting surface 30mm farther out than the 70 hub.
The brake rotors also differ such that the discs are located at the same location along the spindle.
We know the rear calipers are identical, I am using rebuilt 80 series rear calipers on mine. But I am still not 100% sure whether the swap would be possible as there are some questions remaining. For instance, why is it possible to use a 15" wheel in a disc braked 70 and not on a late/US model 80? Is it possible that the discs are larger that the calipers are placed further out? I have discs and backing plates on hand to compare, but the rain is keeping me out of my parts shed (on rainy days the door stays shut to keep any moisture out
)The late 80 series has a rear disc diameter of 336mm where as the 70 series is at 312mm (as it is the 90-92 80 series rear discs). The bolt pattern on the backing plate where it mounts to the axle housing seems identical save for a tube for ABS sensor on the US 80. Does the backing plate place the caliper further out on the late 80? Would a backing plate swap be necessary too?
I suppose there are two possibilities, the swap will require a swap of the backing plates as well as the hubs and rotors, or, a simple swap of the rotors and hubs would be sufficient. Stay tuned.
Dave
