The Rock Box is redefining the concept of strength and durability. Crafted from a solid block of aircraft grade 6061-T651 aluminum, it is almost 7/8" thick in the cross section and was built to take on whatever you can throw at it. With its clock-able design that allows you to adjust it in 7 degree increments from stock to flat, The Rock Box is the ultimate choice for anyone looking for a rugged and reliable solution.
Universal design allows the case to be built in either passenger or driver drop orientation without any extra parts, install 4:1 gear set with no fitment/clearance issues.
Case works with 1981 and newer long rear output housing and all aftermarket rear output housings available currently. All holes in the case are blind including the intermediate shaft to eliminate any potential leaks.
NOT all intermediate shafts are made the same, our case is manufactured with this shaft hole blind to eliminate this leak point. The intermediate shaft total length needs to be 5” or under, the case also has a flat to index the stock style shaft machined into the case, it’s best to dry fit the case halves with this shaft in place to verify.
Includes: Main Case body, Case lid, Complete shifting assembly, Front output bearing retainer (stock or 32 spline), Front output preload cap and all necessary fasteners to assemble case.
Empty case weight is 24.13 lbs
Stock gears, stock shafts 70.1 lbs
Stock gears, 32 spline shafts 72.2 lbs
4:1 gears, 32 spline shafts 72.6 lbs
Stock Dana 300 weight 85 lbs
Made 100% in the USA
Wanna make it a 4 speed? Check out our underdrive option.
This is a Pre-Order Product with a 8-10 week turn around as all cases are machined in house.
If you have any questions or comments don't hesitate to give us a call, text or email
