one piece trunk floor installation-yes it will fit!

I see this asked over and over. Can a one piece B body trunk floor be installed with the 1/4's on? Why yes it can! I do it all the time.
Here I will show how:

Our subject is a 68 Road Runner but this method works for any 68-70 B body including Chargers, and 70-74 E bodies too.

First off, most B bodies that need a trunkfloor also need the rear crossmember and bumper reinforcement plates as well. The layers of steel swell up over time with rust.

On this car I used AMD panels. The trunkfloor fit perfect. The crossmember and bumpers plates fit very well too, althought the crossmember did lack the recess for the frame rail tabs on it's top flange, but that is easily remedied with a hammer in about 2 minutes.

I've been restoring Mopars for 25 years. Panel replacement and rust repair are tedious jobs that many people seem to dread, but I love it!

Hats off to AMD for making these excellent panels!

On 68-70 Chargers this can be done without removing the rear crossmember providing the rear valance is off.

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With the rear crossmember removed, the trunk floor will slip in below the tail panel. the tailpanel is attached to the trunkfloor anyway, so only a few more spotwelds need to be seperated at either end to allow the trunk floor to pass through.
Don't forget to weld on the gas tank strap supports first!

Note that on this car, the trunk extensions were left in place too. The AMD trunk floor fit was perfect.

a tip about plug welding: I like to predrill my panel, then screw it down snug. I then remove a few screws, drill into the rail flanges slightly to ensure the weld gets ideal penetration for a strong plugweld. Practice will teach you how much to drill. If you just try to plug weld directly to the rail flange you may not get adequate penetration and have weak welds. This has the added benefit of creating nice nearly flush plug welds that need minimal grinding.
Have a look from below often while welding to see if the weld has created a nice little button that shows it has penetrated well.

Very Nice!!!!!

Thank You!!! for posting this.

and while the crossmember is off, I make up new flanges for the rail ends since they are almost always thin or non existant.

as a side note, look at the tailpanel on this car. No spot welds! this is a virgin car, yet the tailpanel was mig welded on to the trunkfloor. Under all the factory paint and seam sealer. Proof that the factory didn't always do thngs as planned. I suppose the spot welder was broken down or the guy went on coffee break! Not the first time I have seen this on old Mopars.

'Work smarter, not harder' extends beyond waxin'...

that was impressive

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that was impressive

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Yes it was.