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The 66 originally came with a 273 and 904 console shifted automatic. After I got ahold of it, I swapped in a 340 and built 727. I originally planned on putting the same combo back in but was bitten by the 4 speed bug (or 5 speed bug, whichever funds will allow), after my buddy Darren bought a 67 Nova SS 327 4 speed.
In these pics, I show how to install a 4 speed hump into an early A.
![](66images/Floorpan/Abody4SpeedHump1.jpg)
Between 65 and 66 they changed the style of 4 speed shifter (from a Hurst to an Inland shifter I believe), so the 64-65 humps are different than the 66 humps. The 64/5 humps have a small 3" hole and the 66's have a 7"x3" oval that carried over to the later years. The pics below show how to convert a 64/5 hump to a 66 style hump for use with later style Hurst shifter.
The above pictures are of a 64/5 style hump. I will post a pic of a 66 style later.
![](66images/Floorpan/Abody4SpeedHump3.jpg)
This is a shot of the rear tranny crossmember. You can see how the crossmember was "modified" from the factory. I'm not sure whether this modification is necessary when using a later model Hurst shifter.
![](66images/Floorpan/AbodyFloorHump.jpg)
Another shot of the frame modification and what the hump looks like removed from the floorpan. The "ear" on the pass. side is an identifying characteristic of the 63-66 A body hump.
Hump Modification and Installation
I started out by measuring a later humps oval opening and centerline from the back of the hump. Based on the 67 up hump and pictures of a 66 hump, the oval started about 1" from the rear of the humps rear edge. There is an clearance area (for shift linkage?) on the 65 hump pictured that will "go away."
![](66images/Floorpan/4spdHumpMods1.jpg)
Laying out the cuts and sectioning the circle opening. I used a plasma cutter and it made short work of the cuts. A sawsall or cut-off wheel would work well too.
![](66images/Floorpan/4spdHumpMods4.jpg)
All buttoned up! I did another conversion for a Moparts.com member on his 66 cuda. I haven't heard of any problems with it so it must be a go!
![](66images/Floorpan/4spdHumpInstl0.jpg)
The installation went fairly well. I used the floorpan section that came with my hump to lay out my cuts. I cut the section above the tranny crossmember frame so that I could get in there and POR-15 it. Later, I got excited and welded in the hump and forgot to replace the metal over the frame and had to creatively install a new piece!
All done!
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65 Dart Convertible Pages
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Floorpan Replace /
Spitfire Header Installation
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65 Dart 3" Exhaust /
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