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all 78-88 G-Body Cars
GM G-Body Rear Frame Notching Kit, Weld In
1978- 1988 Chevrolet Monte Carlo, Malibu, El Camino
1978 - 1988 Buick Regal, Grand National
1978 - 1988 Pontiac Grand Prix, LeMans
1978 - 1988 Oldsmobile Cutlass
P/N 3061 G-body frame notch kit allows for narrowing the rear upper
frame rails on the G-body for installation of a wider tire. Laser cut
1/8” premium steel follows the frame contour (with some intentional
slight overhang) and is easily weldable with a standard Mig welder.
End enclosures are included to span from the repair to the original
frame. Cutting, welding and
fabrication is required.
precision laser cut mild steel.
oversize to allow for GM frame variances.
enclosures included to span from kit to original frame.
welding and fabrication is required.
designed, manufactured and raced out of Philipsburg, PA-USA.
Fits all 78-88 G-Body Cars
(1) Raise car to a comfortable working height using the method of your
choice. Follow applicable safety procedures.
(2) Locate the existing rear frame that will be sliced and re-boxed
(3) UMI Performance suggests marking the length of your cut based on the
wheel you are trying to accommodate. Mark a long enough frame section to
allow your wheel proper clearance.
(4) The depth of the notch is also dependent on the desired wheel
clearance. As a good starting point, UMI suggests slicing the frame
flush with the inner fender.
(5) Keep in mind it is always best to cut less to begin with and grind
to exact fit rather than trying to cut to exact dimensions.
(6) Use a vise and a hammer to bend the four smaller frame plates until
they match the shape of the notch ends. Tack weld small plates into
(7) In preparation for welding, trim the large plates so they slightly
overlap the small end plates.
(8) Before welding the large main plates, clamp them into place and
check for good seams to place weld bead. The plate is slightly oversized
to allow proper fit to all 78-88 G-body frames. Grind large plate for
(9) First, properly clean the existing frame of dirt and rust to expose
bare metal for the welding process. Weld small end plates in place
first, and then weld the larger plates.
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