Fiberglass Inner Fenders (Extreme SloshTubz Pair) – 1973-87 GMC Chevy Trucks

Slosh Tubz Extreme | Frame-Laying Fiberglass Inner Fenders for 1973–1987 Chevy Trucks

Built for the truck that goes all the way down. The Slosh Tubz Extreme are engineered for frame-laying 1973–1987 Chevy Square Body trucks — and now extend fitment to select 1988–1991 Blazers, Suburbans, and 1-ton trucks. If your build is built to lay frame, these are the Tubz built for you.

Built for the Extreme Drop

While our Mild Tubz are designed for static and mild air bag applications, the Slosh Tubz Extreme exist for one purpose — maximum drop. These are the inner fenders for the builds that don't stop until the frame hits the ground.

Two-Piece Mold Construction

The Slosh Tubz Extreme are produced using a two-piece mold process, which allows for the aggressive shape and clearance required for frame-laying applications. Here's what to know about the construction:

• ✅ A small flange lip around the mold seam edge is present and will require minimal bodywork
• ✅ This area is completely hidden once installed — nobody will ever see it on a finished build
• ✅ The result is a clean, finished appearance with the extreme clearance your build demands

Premium Fiberglass Quality

Built from the same heavy duty fiberglass used across our entire Tubz lineup — smooth, strong, and needing very little prep work before paint.

What's Included:

• ✅ Slosh Tubz Extreme (pair)

Fits:

• 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 Chevrolet / GMC Square Body Truck
• Select 1988 | 1989 | 1990 | 1991 Blazer, Suburban & 1-Ton Truck applications