Here is a picture to illustrate the difference Andrew refers to. The gearbox tunnel was originally pretty much symmetrical. The hole for the linkage at the top of the red area has had to move outward about 2 inches to get a clean vertical drop down the side of the transmission.
Modification to the tunnel and re-engineering the linkages is about the most time consuming part of upgrade to overdrive.
Many thanks to Geoff for the helpful link on how to adjust the kickdown.
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