SKU: CCE3687
MPN: C/E3687
The CHASSIS ENGINEERING Mustang Mini Tub Kit (C/E3687) is built for owners of 1979-1993 Fox Body Mustangs who want to run wider rear tires than the factory wheel wells allow. Drag and street-strip builders use a mini tub to gain inboard clearance, letting a fatter rear tire tuck under the quarter panel without rubbing. This kit ships as a pair of formed steel tubs with the filler plates and instructions needed to complete both sides. It targets a common bottleneck on Fox-body builds: getting enough sidewall and tread under the car for real traction.
Each tub is stamped from 0.024-inch steel (24 gauge) and formed in a half-moon profile with a rolled edge for rigidity. The flats are joined with Pittsburgh seams, the same lock-seam method used in production sheet metal work, which keeps the panels tight without relying on weld beads alone. The kit ships in a natural finish, so the steel is ready for prep and paint or coating to match your wheelhouse and undercarriage work. Filler plates are included to close the gaps between the new tub and the existing inner structure, and full installation instructions cover the cut-and-fit sequence. Sold as a pair per manufacturer specifications, the C/E3687 handles both rear wheel wells in one purchase.
Plan a mini tub install when you've already decided on a rear wheel and tire package that won't fit stock sheet metal, since the tubs dictate how much room you have to work with. The job involves cutting the factory inner wheelhouse, fitting the new tubs, and welding everything in, so it pairs well with rear suspension and axle work done at the same time. If you're sourcing other panels and structural pieces for the build, browse our exterior components selection, including steel 43-inch tubs and fender flares for wider stance setups.
This kit is designed for 1979-1993 Ford Mustangs, commonly known as the Fox Body platform. It is intended for builders adding wider rear tires for drag racing or street-strip use that won't fit under the factory inner wheelhouses.
The kit ships as a pair, covering both rear wheel wells. It also includes additional filler plates and full installation instructions to close the gaps between the new tubs and the existing inner structure.
Each tub is formed from 0.024-inch steel, which is 24 gauge. They are half-moon cut and formed with a rolled edge for rigidity, and the flat sections are joined using Pittsburgh lock seams.
No. The tubs ship in a natural steel finish. That leaves them ready for prep and your choice of paint or protective coating once installation and welding are complete.
Yes. A mini tub install involves cutting the factory inner wheelhouse and welding the new tubs into place. The included filler plates and instructions cover the cut-and-fit sequence for both sides.
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