Mustang Dynacorn Full Quarter Panel (1969) Installation Instructions

Tools Required:
  • Edge Crimper
  • Spot Weld Driller
  • Cut Off Wheel
  • Inch Grinder with Flapper Disc
  • Mig Welder
  • Vice Grip Paddle Crimper
  • Clamps
  • Plasma Cutter
  • Wide Mouth Clamps
  • Air Chisel
  • Drill
  • Paint Gun
  • Hammer Dolley & Cutters
  • Two Stage Compressor
  • 4-inch Sander
Install Difficulty:
  • Difficult
  • Difficult Project
1. To begin installing your new Mustang Dynacorn 3645K Full Quarter Panel, make sure to measure everything! Make sure doors are on and close well with even lines along the old quarter. Measure from the front door jamb's top middle and bottom to the quarter panel. Measure the back window at the roof to the rear window's lower panel in three locations and draw it out on paper. Measure across rear window from quarter's edge to quarter edge in three locations. Measure the trunk lid's opening from both directions in three different locations. Measure locations of sail panel emblem studs from a solid point that is not being removed.
2. Take pictures up close of the door jambs and weld locations, the trunk and back window areas, the quarter to taillight section, the wheel well to quarter areas, the wheel well to trunk areas, the Mustang taillight panel to quarter extensions, the quarter to rocker line, the roof weld area at the quarters, the quarter window ledge where quarter is welded. All of these pics can help later when installing and things will not fit. Usually, it is something simple you missed. Pay attention to the quarter to quarter extensions and how they over lap each other. Also take pics of quarter to trunk extensions from behind rear wheel, down low.
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
3. Weld a brace in the door jamb from the rocker near the front seat base, diagonally to the quarter window side panel near the rear arm rest area. This will prevent the door jamb from changing when removing quarter. Brace back window panel, underside to the Mustang trunk floor to prevent it from dropping. Weld a brace on both sides from trunk floor at taillight area but not on the taillight panel to the trunk hinge brace. Also put jack stands from floor to rear of trunk floor to prevent it from dropping when taillight panel is removed.
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
4. Start drilling out welds on the first quarter, wheel wells, lower quarter, taillight to quarter, roof to quarter, etc. Once free, remove the Mustang quarter panel. Remove and replace the wheel wells on one side. Screw the wheel wells in place--don't weld yet. Fit the quarter panel and screw it in place, fit the taillight quarter extensions and taillight panel (if you removed it). Screw everything in place and double check all of your measurements. Now remove all of the panels and prep them for welding. Coat the inner sail panel areas with por15 before installing the quarter panel. Be sure the wheel wells matched the quarter lip and that the quarter panel will push in flush with rocker panel. At this point you can also install the one piece trunk floor.
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
5. Install the wheel wells, clamp and weld. Be sure to weld the support to the wheel well--this is on top of the wheel well area--to trunk hinge support. Epoxy prime the back side of Dynacorn quarter panel to seal it. Drill all weld point locations and grind the weld areas. Install the quarter panel and recheck all fit points and measurements. Screw it in place, but don't weld the quarter panel until the other quarter is in place along with the taillight section. You may have to split the difference side to side at that point. Now start all over on the other side of the car. Once both quarters, the taillight panel, and quarter extensions are all screwed in place and measurements are good, door lines are good, and trunk lines are good, you should be ready to weld the back of the car together. Tack everything in place and recheck all measurements. Once you weld, you are set in stone without a lot of rework. Be sure you weld the inner rocker to quarter edge and get it flush. Be sure the quarter to roof overlay is flat and below roof/sail panel level. Use a high quality filler in this area and give it time to fully cure and shrink before priming. I like to let filler set for at least a day in thicker areas.
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
6. Grind all welds, scuff all panels with 400 grit, clean all panels with wax and grease remover, then epoxy prime all areas. Prime all areas with 2k100 after most dings and any warped areas are filled or dollyed out with body hammers, which finishes the installation of your new Mustang Dynacorn 3645K Full Quarter Panel.
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image
Mustang Dynacorn Full Quarter Panel Install Image