been running a 8.5 10 bolt 4:56/4:88 in a 70 camaro (3200 pounds running 10:20/10:10's 's At 135 ) with the cover and braces for years , they keep the tubes from bending forward and help push the gear caps back in place from the gear trying to push out the back , we ran it without the braces and the tires had a funky pattern on them and slowed down by .15, so they work and we think this is why the axle and gears lasted as long as they do 4 seasons on the 4:88's then we broke the teeth off because someone reused the crush spacer when they inspected the gears ..
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