4 Speed Floor Hump

[larry4406]

I am getting ready to cut the floor for installation of the floor hump.   My car has original floor pans and is a 71 barracuda.  The hump is an original piece, not sure of year that I got it out of 25 years ago.

Any event, there is a gap between the hump and the floor.  Same as in the pictures below I stole from Noob's resto thread.

What is up with this gap and how to close?  Is the repo hump  for a specific year floor?  My floor and hump look just like these.

[ksierens]

Just take a 2x4 and a hammer and pound it flat to the floor, or use a hammer and dolly.

[GranCuda1970]

I still need to do that!! ! Should have done it first.

[vinb]

My 73 'Cuda floor pan a little different??

[larry4406]

Just take a 2x4 and a hammer and pound it flat to the floor, or use a hammer and dolly.

Yea i get the bfh technique and will head down that path.  I had heard there was a '70 floor pan style, and then a 71-74 floor pan.  My 71 does not have the rib that his 73 does to match the hump.

[rhamson]

My '72 Challenger had the bump in the floor yours seems to be missing.  My tunnel was from AMD.

[Challenger III]

My 4 speed hump install (AMD):

[larry4406]

Challenger III - I actually printed out your picks to guide me, thank you for posting.  In your pric's, it looks like you offset your floor cut by about 3/4 inch relative to your perimeter tracing based on scaling the photo.

The original hump I have (not sure what year or frankly if cuda or challenger, been 25 years since I liberated it with a cold chisel and hamer) seems to indicate about 1/2 inch offset along the centerline of the transmission while the other edges are about 3/4 inch.  This based on the pattern of rust and overspray of undercoat.

[Challenger III]

it looks like you offset your floor cut by about 3/4 inch relative to your perimeter tracing based on scaling the photo.

The original hump I have (not sure what year or frankly if cuda or challenger, been 25 years since I liberated it with a cold chisel and hamer) seems to indicate about 1/2 inch offset along the centerline of the transmission while the other edges are about 3/4 inch.  This based on the pattern of rust and overspray of undercoat.

This sounds about right. I will trim excess around the opening when my car is on the rotisserie. I'm actually not positively sure how the factory did it, I am going to go by what will look the best appearance - wise. I'm happy I could assist to the degree I could.