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Discussion Starter · #1 ·
I've cracked 3 rear hub/axles while endurance racing, and know of a few other Supra owners with the same problem. The failure point seems to be the e-brake access hole and then a crack radiates to the center of the hub.





I've spoken with 2 friends who are machinists and they both mentioned that the radius of certain areas is not up to the stresses of racing or high power levels. I asked about creating a solution and the best answer was billet Chromoly replicas with updated radiusing where necessary.

The first drawing is below and includes (4) and (5)-lug options. The machinist mentioned that the lug and e-brake access holes would be the last stage of production and could be different on each (I don't use an e-brake, and will be using 5-lug wheels on a new project).



At this time I have no idea on price, but the more sets that are made will result in lower price for all. The reality is that they will be expensive ($1200-1500 set?). A few people in my race thread have expressed interest and I wanted to capture a bigger audience here.
 

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...At this time I have no idea on price, but the more sets that are made will result in lower price for all. The reality is that they will be expensive ($1200-1500 set?). A few people in my race thread have expressed interest and I wanted to capture a bigger audience here.
$1200-1500... Ouch!

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I'd be interested in a set, 4 lug with the E brake hole (you can put the hole about 1/8" further outboard compared to stock it's just for installing the E brake springs and other hardware)

Did you break another one using proper metal hub rings on your wheels? Still looks like some kind of oddball radial or axial load not a torque issue...
 

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Discussion Starter · #4 ·
I'm up to 3 personally, the last one with aluminum hub rings in place.

When you lose revenue from 3 races due to parts breaking, the price is very attractive. They're definitely not for everyone.
 

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Interested. Just built my diff, so may as well build this
 
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