1969 Boss 302 Mustang

I initially patched the original floor pan in this Boss
using sections. When a full pan finally became available
through parts vendors, I decided to cut out the patched
pan and replace the entire floor with a nice, new, full
pan. One problem I ran into was that the full pan had a
couple of areas with incorrect ribbing for 1969 Mustangs.
The incorrect features of the pan and how to correct them
are shown below. The full pan offered by Dynacorn is the
one I decided to use for this project. It is the most
"correct" pan on the market and needs the least amount
of modifications to fit the 1969 and '70 Mustangs. Once
the ribbed sections are modified as shown below, it is
nearly identical to the car's original pan.



The Dynacorn floorpan that is advertised as being "correct" for
'69 and '70 Mustangs, isn't. The ribbing is different on the new
pan so in order to make it correct, I had to use two front-short
donor pans and cut out a section of ribbing. That section was then
used to patch the new pan. There are still some subtle differences
in the new pan compared to an original '69 floorpan, but the patches
made it pretty darn close. I had to be extra careful of warping due
to having so much heat in such a small area, but overall the job
went well. After I finish the installation, I can use a small amount
of body filler and make the patch seams invisible. Short of finding
a 37 year old, perfect donor car with a good, rust-free floorpan, the
best solution for repairing '69-70 Mustangs is to go with the full
pan from Dynacorn and then weld in the patches. A big hassle, yes,
but it beats having '65-68 floors in your '69-70 Boss Mustang.

Here's how to correct the full pan ribbing for '69/70 Mustangs,
and some photos of different stages of the pan installation. The
final couple of pictures show the rear seat and interior panels
being temporarily re-installed to verify that the brackets they
bolt to are installed in the correct locations. Making a 1/4" or
1/2" mistake here would result in the interior panels not fitting
correctly. That's a big "oops" you want to avoid. Always measure
and test fit any new panel installation at least twice before
welding it permanently in place. You'll be glad you did!!






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                                                             Last modified: January 22, 2011