I swapped from a 3 speed floor shift Saginaw to a 4 speed Saginaw in a 1967 Lemans with an OHC 6.
Bolting in was easy. And Saginaws, even 4 speeds, are usually cheap.
Saginaws have several first gear ratios. I found a 3.11, the ratio that originally came with 67 sixes. It is noticably lower.
Getting a shifter and rods to match up with the console was a finicky business, however. In the end I used period pieces found on ebay.
Price it all out. If you're buying new and want asimple kit with shifter, rods and all, a 5 speed probably starts to come into sight.
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