The Dana S135 axle is similar to the Dana S110 in that it features an Eaton dropout carrier, however, the Dana S135 uses a 2" larger 14.25" ring gear and 36 spline (instead of 34 spline) full-floating axle shafts. They were used exclusively in '99 - '05 Ford Class 5 commercial trucks and vans and are considered to be the highest rated rear axles available. Unfortunately, due to their limited availability, aftermarket support is very limited.
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