AREAS OF CHEVY / GMC TRUCKS PRONE TO RUST

1980 GMC

THE TOP EDGE OF THE FRONT FENDERS, AND THE INNER FENDERS (WHEEL WELLS)

1980 GMC Fender


A PREVIOUS OWNER CHOPPED THE FRONT LOWER SECTIONS OF THESE FENDERS OFF. DUE TO RUST AND THE 33"TIRES WITH NO LIFT KIT. THE ENTIRE LIP ROTTED OFF THIS FENDER. THE LOWER SECTION BEHIND THE WHEEL WAS REPLACED. THE WELD CAN BE SEE WITH THE DRIVERS DOOR OPEN. RUST ALONG THE WELD ON THE FRONT SIDE IS VISIBLE TOO.
LARGE BLISTERS UNDER THE PAINT, I TAPPED ONE WITH A BODY HAMMER.
SEE THE HOLE? THE CAB FLOOR SUPPORTS ARE ALSO HOLLOW, TRAPPING MOISTURE INSIDE.


1980 GMC Cab Floor Support

[IMAGE]

THE ROCKER PANELS UNDER THE DOORS.
CHEVY'S WELL KNOWN FOR THIS ROT.
THERE IS A REASON.
POOR DESIGN. :o(
LET ME EXPLAIN. FROM 73-87, CHEVY'S AND GMC'S HAD THE SAME DESIGN. A DESIGN WHICH USED AN INNER ROCKER PANEL. IN EFFECT, "SEALING" THE ROCKER, AND TRAPPING MOISTURE.
1984, AND MAYBE EARLIER MODELS HAD SHIELDS MADE OF PLASTIC. THEY EXTENDED FROM THE REAR LIP OF THE FRONT WHEEL WELLS, TO THE CAB FLOOR SUPPORT. THIS HELPED A LOT, BUT WATER STILL HAD MANY PLACES TO GET IN. I HAVE AN 80 GMC, AND THE ONLY REASON THE BODY IS STILL IN ONE RUST HOLED PIECE, IS BECAUSE IT HAD A RUST PROTECTION TREATMENT FROM DAY ONE. (ęZIEBART). THE ROCKERS NEED REPLACING. IT IS 18 YEARS LATER THOUGH. THEY ARE ORIGINAL. THE LEFT FRONT FENDER HAD A SECTION REPLACED. I REPLACED THE BED LAST YEAR, AFTER IT ROTTED IN HALF. THIS TRUCK SAW SEVERE DUTY IN A ROCK QUARRY IN IT'S FORMER LIFE. 130,000 MILES OF IT. THE BED WAS A COMPLETE WASHBOARD WHEN I BOUGHT IT. OVERLOADED OFTEN IT SEEMS.
AFTER REPLACING THE PASSENGER ROCKER ON MY 77 CHEVY, FOR THE SECOND TIME, I LEARNED. DON'T WELD THE BACKS ON THE ROCKERS .USE FLUID FILM WITH A WAND TO GET INSIDE THE CAB FLOOR SUPPORT, WHERE IT IS WELDED TO THE INNER ROCKER. USE THE SECTION OF INNER ROCKER, WHERE THE CAB MOUNT MEETS IT, SO YOU CAN WELD THEM TOGETHER. CHOP OFF THE ENDS. I USED 2 ONE INCH WIDE SECTIONS TO ADD A LITTLE SUPPORT NEAR THE ENDS.
AFTER DOING A LITTLE WORK UNDER A 93 SILVERADO, AND A 95 DODGE RAM, I SAW A COMMON DESIGN.
NO INNER ROCKERS. A GREY COATING ON THE BACK SIDE, ON BOTH BRANDS OF TRUCKS. BOTH SAW A LOT OF SEVERE DUTY. NO RUST. NO MUD CAKED ON THEM, YET THE FRAMES WERE CAKED ON BOTH TRUCKS. NONE ON THE BODY UNDERSIDES. BOTH TRUCKS VISIT THE CAR WASH OFTEN TOO. PLOW IN THE WINTER TOO. NOT A SPECK OF RUST ON THEIR BODIES ANYWHERE ..........YET.

RUST PAGE 2 ~>
Page 2

Replacing Rusted Body Parts

 

 JC Whitney

Parts I've bought from JC Whitney personally:

For my 77 Chevy K/20 -

Passenger Replacement Door
Drivers Replacement Fender
Both Front Inner Fender
Both Cab Corners
Both Rocker Panels
Both Cab Floor Supports
Both Inner Rocker Panels
Front Bumper Valence
Rear Wheel Wells
Stainless Steel Tube Grille
Replacement Headlight Bezels
Front & Side Marker Lights
Replacement Front Turn Signal Housings
Replacement Front Turn Signal Lenses
Replacement Tail Light Assemblies
Aux. Transmission Fluid Cooler
Radiator (4 row)
Wire Loom
3" Body Lift
Polyurethane Sway Bar Bushings
Polyurethane Cab Mount Bushings
Stainless Steel 150 watt Off Road Lights
Replacement Custom Fit Carpet With Padding (fit perfect!)
Chrome Master Cylinder Cover
Replacement Steering Stabilizer Cartridge
Solid Oak Aircraft Style Dome Light
Door Hinge Pin Bushing Kit (fixes saggy doors!)
Door Weatherstripping
Vacuum Gauge
Both Door Mirrors
Bed Tool Box (mounted behind Wheel Well)
2 Replacement 22 gal. Replacement OEM Spec. Fuel Tanks (I needed both)
Replacement Power Door Lock Actuator
Keyless Entry Kit
Deflecta Shield
Chrome Tube Grille
In Bed Tool Box


For my 80 GMC K/25 -

Replacement Custom Fit Carpet With Padding
Clock
Both Door Mirrors
Replacement Steering Stabilizer Cartridge


My 74 Jeep CJ-7 (only owned a few months)

Replacement Rear Shocks
Novus Plastic Polish (takes the haze off soft top windows!!)
Heater Core
+ Lug Wrench


JC Whitney Everything Automotive.
Chevy Truck RUST REPAIR PANELS, Doors, ....



Grilles & Grille Trim - Upper mouldings, lower mouldings, grille, headlight bezels, etc.


Steering Box Brace  Use this to repair a cracked frame, or to reinforce yours before it cracks!


Body Gasket Set - If your lights have moisture in them, these gaskets are the cure. Well worth it. 


Poly Cab Mount Bushings Sets


Buy New Door Striker Bolts Now!


Headlight Bezels 


Custom Fit Replacement Door Weatherstripping


Buy Custom Fit Replacement Door Vent Window Weatherstripping Now!



Replacement Windshield & Rear Window Channels


Cab Rust Repair Panels


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