These extra beefy differential covers are made by Ruff Stuff Specialties and are the best bang for your buck. 3/8" thick cover starts as a one piece A50 plate steel cover bent 8 ways and then expertly welded inside and out to a 3/8" thick flange. A50 steel has a tensile strength of 50,000 psi. Nice large 1 1/4" fill plug. Works on both hi and low pinion Dana 60 axles. MADE IN THE USA.
