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I think these were all aftermarket or dealer conversions. They add an overdrive unit that replaces the tail housing and either put the overdrive on the column and the reverse is now a lever under the dash or they use the lever for the o/d but they all started as 3 on the tree.
I did a little research on these just last week as I am in the midst of rebuilding an old Impala and we are leaving the 3 speed transmission because we don't want to switch to buckets or notch the bench to install a 4 speed.
However the transmission shop said that Mercedes and some other import did have a 4 on the tree.
My friend's dad had an old Sabb wagon (2 cycle!) that had a 4 on the tree!..
I drove it once...to back up,you had to pull outward on the shifter,and put it in "second",that was reverse!...
Never seen a 4 on the tree in any american car...3 speed with overdrive,yes..
I'm confused. Since reverse seems to be moved to the second lever underneath the dash, the column shifter still has 4 positions, just like any "normal" 3-on-the-tree, right?
Having a third axis on the column would be neat... (5-on-the-tree, anyone?)