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41 Cad Transmission Hump Floor Pan Screws

Started by Whit Otis, 1188, January 13, 2018, 08:07:35 PM

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Whit Otis, 1188

Does anyone know the length of the screws that secure the transmission hump floor pan to the floor (hydramatic).  These are 1/4-20 thread with the big 3/4" diameter slotted head similar to the screws that secure the insulation to the inside of the firewall.

Need to know;
Length of screw
Does it have a lead point (cone) at the end of the threads?

Thanks
Whit
Whit Otis -
1941 6219D Custom
1941 6219D
1940 7533F
1986 Mercedes Benz 560 SEL
1999 Bentley Arnage
2019 XT5
Drawing of AP Sloan Custom by Terry Wenger

Bobby B

Whit,
  Hi.. They were like 3/4-1". Some had a point, some didn't. Same with my firewall. They might've grabbed whatever was in the box when these cars were assembled. I replaced them with new anyway. I used Hurricane shutter screws. They're 1/4-20, Stainless, and  have the same wide head. Bought a whole box if you want some for your trans cover.
             Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

Whit Otis, 1188

Thanks Bobby.

I have a number of original screws in several different lengths.  Soon as I figure out what's what, I may look at the Hurricane screw option for those screws that are hidden under the carpet.  I will try to use original screws for the firewall insulation since the heads show and it would be important to have the correct rounded truss head rather than the flattened head on the hurricane screws.

Thanks again
Whit
Whit Otis -
1941 6219D Custom
1941 6219D
1940 7533F
1986 Mercedes Benz 560 SEL
1999 Bentley Arnage
2019 XT5
Drawing of AP Sloan Custom by Terry Wenger

Bobby B

Quote from: Whit Otis, 1188 on January 14, 2018, 04:08:48 PM
Thanks Bobby.

I have a number of original screws in several different lengths.  Soon as I figure out what's what, I may look at the Hurricane screw option for those screws that are hidden under the carpet.  I will try to use original screws for the firewall insulation since the heads show and it would be important to have the correct rounded truss head rather than the flattened head on the hurricane screws.

Thanks again
Whit

I have no intention on using any of my original screws. It's not a show car, and I'd rather have new/stainless. Some of the heads might be buggered and that's another reason why I went new. If you need any originals, you're more than welcome to them.
                                                                                                                  Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

Steve Passmore

Very seldom can the originals be used on the firewall insulation pad. The reason for this is they are really long at the factory to allow for the thickness they have to pass through. This allows the assemble men to tighten them as necessary they literally 'crop' off the ends with bolt cutters. When you remove them they are then too short for the new material they have to try and compress if it's the same as the original. This was a normal GM practice.  I have a box of them now all too short to use.
Steve

Present
1937 60 convertible coupe
1941 62 convertible coupe
1941 62 coupe

Previous
1936 70 Sport coupe
1937 85 series V12 sedan
1938 60 coupe
1938 50 coupe
1939 60S
1940 62 coupe
1941 62 convertible coupe x2
1941 61 coupe
1941 61 sedan x2
1941 62 sedan x2
1947 62 sedan
1959 62 coupe

Bobby B

Steve,
Hi. You are correct...They look like they were all cut randomly. I thought someone else did that down the line. Now your comment makes sense as to why they looked "Hacked" when I removed them. I guess I was the first one in there....
                                                                                         Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

The Tassie Devil(le)

It is surprising just what was done whilst cars were being built.

If we did things like that, we would be castigated, and lose points.

Bruce. >:D
'72 Eldorado Convertible (LHD)
'70 Ranchero Squire (RHD)
'74 Chris Craft Gull Wing (SH)
'02 VX Series II Holden Commodore SS Sedan
(Past President Modified Chapter)

Past Cars of significance - to me
1935 Ford 3 Window Coupe
1936 Ford 5 Window Coupe
1937 Chevrolet Sports Coupe
1955 Chevrolet Convertible
1959 Ford Fairlane Ranch Wagon
1960 Cadillac CDV
1972 Cadillac Eldorado Coupe

Bobby B

Quote from: The Tassie Devil(le) on January 15, 2018, 05:30:15 PM
It is surprising just what was done whilst cars were being built.

If we did things like that, we would be castigated, and lose points.

Bruce. >:D

Maybe Steve can enlighten us on the moving of nuts and bolts and the mixing of various threads, pitches, and style ( Whitworth, BSF, SAE, etc.) over the years around England most notably found on MG's, BSA's, Triumph's, Jaguar's, etc. Sometimes they grabbed all different types of fasteners on the same vehicles. I had my fair share of frustration with British Cars and Bikes. They changed over at some point, and depending on where stuff was assembled, it could be a nightmare.
                                                                                                                                                                                                      Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

39LaSalleDriver

If I'm reading right, it looks like Bob's Automobilia has both these and the firewall bolts available.
Jon Isaacson

1939 LaSalle 5019

Steve Passmore

Quote from: Bobby B on January 15, 2018, 09:31:37 PM
Maybe Steve can enlighten us on the moving of nuts and bolts and the mixing of various threads, pitches, and style ( Whitworth, BSF, SAE, etc.) over the years around England most notably found on MG's, BSA's, Triumph's, Jaguar's, etc. Sometimes they grabbed all different types of fasteners on the same vehicles. I had my fair share of frustration with British Cars and Bikes. They changed over at some point, and depending on where stuff was assembled, it could be a nightmare.
                                                                                                                                                                                                      Bobby

We had the same sort of problems Bobby. During the 70s many of our Fords were assembled in many different countries so came with metric fittings. Used to drive me mad as all my tools were either Whitworth or Af. I had a 1976 Granada manufactured in South Africa with Af and metric fittings. A right nightmare.
Steve

Present
1937 60 convertible coupe
1941 62 convertible coupe
1941 62 coupe

Previous
1936 70 Sport coupe
1937 85 series V12 sedan
1938 60 coupe
1938 50 coupe
1939 60S
1940 62 coupe
1941 62 convertible coupe x2
1941 61 coupe
1941 61 sedan x2
1941 62 sedan x2
1947 62 sedan
1959 62 coupe

The Tassie Devil(le)

I had a similar problem when I was renovating my first home.

Imperial measurements, when I rebuilt the front half, then Metric when I was rebuilding the back half.

Framing timber came in Imperial from the older sawmills, Metric for Plaster Sheeting and kiln-dried timber, and Imperial for cabinet fittings that came out of Taiwan.

Mix it all with a building that was out of level, and square, and took a lot of compromising to complete.   Metrication was a pain, and I still am compromising with tools, working on my older cars that are UNF and UNC, then my later cars that are Metric, and mix that in with my mates' Motor Cycles which are Whitworth, and Metric, and my marine stuff which is Whitworth, UNF and UNC.

Now all these Torx and other screw heads.   Boy, I am glad I will be winding down in about 20 years time.

At least my Cadillac is UNF and UNC.

Bruce. >:D
'72 Eldorado Convertible (LHD)
'70 Ranchero Squire (RHD)
'74 Chris Craft Gull Wing (SH)
'02 VX Series II Holden Commodore SS Sedan
(Past President Modified Chapter)

Past Cars of significance - to me
1935 Ford 3 Window Coupe
1936 Ford 5 Window Coupe
1937 Chevrolet Sports Coupe
1955 Chevrolet Convertible
1959 Ford Fairlane Ranch Wagon
1960 Cadillac CDV
1972 Cadillac Eldorado Coupe