1955-59 Boxed Inner Frame Stiffener, 2 Piece Driveshaft


New Boxed Inner Frame Stiffener for Level 2 & Level 3 Dropmember Equipped Trucks

Fits: 1955-59 Dropmember Equipped Chevy Trucks

1955-59 Inner Frame Stiffener, Boxed
2-Piece Driveshaft
For Dropmember Level 2 & Level 3 Equipped Trucks

Our new Boxed Inner Frame Stiffener is designed to strengthen and reinforce your frame and is an ideal solution for LS swapped trucks.

The IFS incorporates adjustable transmission and carrier bearing mounts to make installation easy.

An Energy Suspension transmission mount is necessary. We recommend one of the two below for GM transmissions:
Energy Suspension 3.1108G GM Transmission Mount
Energy Suspension 3.1158G GM Transmission Mount - Short

Product Compatibility

  • 1955-59 Chevy Trucks
  • Dropmember Level 2 & Level 3 Trucks
  • 2-Piece Driveshaft

More Information
PB Fab
Build time
Typical Production Time is 4-5 weeks
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Lead Time & Shipping Info

All Porterbuilt products are hand built by our staff of professional fabricators in our Arizona facility, using state-of-the-art welding and precision fabrication equipment. Our products are built with quality and performance in mind.

For additional information on our manufacturing and lead times, please click here: Production & Shipping Info.

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