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hump welding #2651470
05/03/19 08:38 AM
05/03/19 08:38 AM
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gainsville, usa
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johnfin Offline OP
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were the original 4 speed humps lap welded and if so how did they keep
dirt and water out of that joint?

Re: hump welding [Re: johnfin] #2651482
05/03/19 09:25 AM
05/03/19 09:25 AM
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Ontario, Canada
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Stanton Offline
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They were spot welded. Seam sealer was used around the joint.

Re: hump welding [Re: Stanton] #2651494
05/03/19 10:00 AM
05/03/19 10:00 AM
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gainsville, usa
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johnfin Offline OP
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seam sealer on both sided or body under coating on bottom?

Re: hump welding [Re: johnfin] #2651634
05/03/19 04:33 PM
05/03/19 04:33 PM
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Stanton Offline
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There is no seam sealer on the underside of the car ANYWHERE. Seam sealer was not intended to keep moisture out of the seams, it was intended to keep moisture out of the inside of the car. All seam sealer is applied from inside the car with the exception of the outer side of the kick panels and the cowl bead which was applied before welding. Oh, and the rear wheelhouse joint.

Re: hump welding [Re: Stanton] #2651741
05/03/19 09:26 PM
05/03/19 09:26 PM
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East Aurora (Buffalo) NY
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Originally Posted by Stanton
They were spot welded. Seam sealer was used around the joint.


On my 68 and 69 Road Runners they are stitch welded, one inch or so of weld ever 6 or so inches around the perimeter. Seam sealer gobbed all around the hump from the inside basically covering the lapped metal. No seam sealer from underside. Though, if not concours correct, wouldn't be a bad idea.


68 Road Runner (383/4speed, post car w/decor pkg) - Major Project
69 Road Runner w/472 Hemi & 4 speed.
70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project
2023 Ford Mach 1
Re: hump welding [Re: RoadRunner] #2651749
05/03/19 10:01 PM
05/03/19 10:01 PM
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Freeport IL USA
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Using seam sealer on the bottom of body seams will promote rust! Any water that got between the two pieces of metal (think condensation) couldn't get out until it rotted through. Gene

Re: hump welding [Re: RoadRunner] #2651763
05/03/19 10:50 PM
05/03/19 10:50 PM
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70HemiGTX Offline
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On my 68 and 69 Road Runners they are stitch welded, one inch or so of weld ever 6 or so inches around the perimeter. Seam sealer gobbed all around the hump from the inside basically covering the lapped metal. No seam sealer from underside. Though, if not concours correct, wouldn't be a bad idea. [/quote]


That's how the hump is welded into my 70 GTX.

Re: hump welding [Re: 70HemiGTX] #2652978
05/07/19 01:21 PM
05/07/19 01:21 PM
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gainsville, usa
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johnfin Offline OP
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does the hole in the tunnel follow the hump profile or is the hole smaller.

Re: hump welding [Re: johnfin] #2653019
05/07/19 02:52 PM
05/07/19 02:52 PM
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Stanton Offline
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Smaller by a long shot. Best guess ... if you scribed the outer edge of the flange and then cut 1-1/2 inches inside the scribed mark you'd be close. They probably had a pattern but its basically big enough for the shifter and rods

Re: hump welding [Re: Stanton] #2653184
05/07/19 10:07 PM
05/07/19 10:07 PM
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gainsville, usa
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johnfin Offline OP
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i would think if it didnt follow the hump profile there would be a pocket for dirt to get trapped.

Re: hump welding [Re: johnfin] #2653284
05/08/19 08:18 AM
05/08/19 08:18 AM
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East Aurora (Buffalo) NY
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Originally Posted by johnfin
i would think if it didnt follow the hump profile there would be a pocket for dirt to get trapped.


Yep it can trap dirt and moisture. The hole stamped in the floor pan for the four speed cars is smaller than the outside flange of the hump. If you place the hump on the pan, it will drop right into place. Take a sharpie marker and trace around the outside of the flange. I removed a hump from a parts car (back before there were reproductions) and the measurements I took were something like 1" from outside flange up towards the firewall and back by lower end of hole next to the seat. The rest (flat floor area and top of hump seemed to be about 1-1/4" to 1-1/2" away from outside flange. To make sure you have enough space, I'd go with the 1". The rods up at the front get pretty close to the floor.

Here is a worms eye view looking up at shifter. You can see floor pan is close to rods. I actually shipped paint when installing the assembled trans when I restored the car. I now pull shifter and linkage. Where the paint is chipped is a little shelf of the floor pan. Could probably place a dime or so up there. It should have been cut a bit more. The donor hump came from a rusted floor pan so was hard to get good measurements. From the factory all this work was done as the body was being assembled and the whole thing got dipped and primed. So the potential to rust was about the same as other places on the body.

IMG_1096 - Copy.JPG

68 Road Runner (383/4speed, post car w/decor pkg) - Major Project
69 Road Runner w/472 Hemi & 4 speed.
70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project
2023 Ford Mach 1
Re: hump welding [Re: 70HemiGTX] #2658582
05/23/19 10:08 PM
05/23/19 10:08 PM
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Way North Idaho
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Originally Posted by 70HemiGTX

On my 68 and 69 Road Runners they are stitch welded, one inch or so of weld ever 6 or so inches around the perimeter. Seam sealer gobbed all around the hump from the inside basically covering the lapped metal. No seam sealer from underside. Though, if not concours correct, wouldn't be a bad idea.



That's how the hump is welded into my 70 GTX. [/quote]


Same for the hump I pirated out of a '70 Roadrunner


'68 Bee 383/TF/Factory Air...high school sweetheart
'67 GTX Clone project,500 six pack,Hemi4-speed,Dana
05 Dodge Viper, 505 V-10, 6-speed Tremec






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