Cutout in floor for 4-spd hump 1968 Roadrunner

[Matts68bird]

Hey there, I am looking to get a reference on how much meat is left under the stitch welded 4 speed hump. I have a repo AMD floor that I will be welding an original 4 speed hump to. The two panels mate up very well and lines up with the body lines perfect. I just want to know how much is cut out of the floorpan. I assume its about the same size as the lip of the hump, but id like to ask before cutting it out. Pics would be greatly appreciated!

Matt

 

[moparnation74]

Hey there, I am looking to get a reference on how much meat is left under the stitch welded 4 speed hump. I have a repo AMD floor that I will be welding an original 4 speed hump to. The two panels mate up very well and lines up with the body lines perfect. I just want to know how much is cut out of the floorpan. I assume its about the same size as the lip of the hump, but id like to ask before cutting it out. Pics would be greatly appreciated!

Matt

 

[Mopar4Speed]

What i did was set the hump on the floor and trace the outer edge of it. Then used green painters tape to trace inside the line to show where to cut to make sure that there is enough mating surface to weld.

 

[Matts68bird]

This is the issue I ran into... Just want some info that I cut out the sheet metal above the crossmemeber or leave the meat there? I see that the crossmember goes into the hump area. Thank you for those who replied but I can't really see where it is sections from the pics above.

 

[moparnation74]

This is the issue I ran into... Just want some info that I cut out the sheet metal above the crossmemeber or leave the meat there? I see that the crossmember goes into the hump area. Thank you for those who replied but I can't really see where it is sections from the pics above.

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Did you not look at my pics above? The last one clarified your question...

 

[Matts68bird]

Did you not look at my pics above? The last one clarified your question...

Thank you and yes I did, but I cannot tell if you cut the floor sheet metal above the crossmember out. Or if it is left and you trim the floor right along side the crossmember. Like my pic above w the lines. Question is if that section stays spot welded to the top of the crossmember and welded right along side, or it gets cut out leaving the top of the crossmember exposed.

 

[dsd1967]

I just completed the same operation and did not take out the material above the cross member....just trimmed it back to the cross member. There is no advantage to removing that additional material....it gains you no extra clearance and if you remove the top material it actually weakens the cross member because it is no longer "boxed" in that area.

 

[Richard Cranium]

I just completed the same operation

Did you do it for duty and humanity?

 

[Matts68bird]

I just completed the same operation and did not take out the material above the cross member....just trimmed it back to the cross member. There is no advantage to removing that additional material....it gains you no extra clearance and if you remove the top material it actually weakens the cross member because it is no longer "boxed" in that area.

That’s what my plan was. I see there is no extra room I will achieve. I plan on to leave the sheet metal on top to keep it from collecting more crap than it needs to. Just find it weird they have a pocket there that catches water and debris... But it was the 60’s!

 

[4mulas]

I have to do the very same thing tomorrow and was wondering where. Glad to have found these pics. I’m not cutting the sheet metal above the cross member, there’s no point to that.

Here are some pictures of my factory cut road runner from below.

I was hoping to learn where to position the hump from above so I don’t have to remove the carpet from the runner to see.

 

[Matts68bird]

I have to do the very same thing tomorrow and was wondering where. Glad to have found these pics. I’m not cutting the sheet metal above the cross member, there’s no point to that.

Here are some pictures of my factory cut road runner from below.

I was hoping to learn where to position the hump from above so I don’t have to remove the carpet from the runner to see.

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these are great! thank you so much. I will be doin some chopping this week.