Number one complaint on the 6-speed is its huge size -- you will basically remove the complete tunnel on the 67. My TKO-600 required two dimples with an air hammer for clearance and the new TKX shouldn't need any tunnel alteration. Number two complaint is the car I drove with the 6-speed had a 3.90 rear and the RPM's were something like 1,700 with the .500 overdrive at 65 MPH. Number three is while the engine is loafing along with the 6-speed overdrive the 4.11 pinion (and driveshaft) is hauling a$$ and creating a lot of heat and wear at higher speeds. Might also want to do a critical speed calculation to see where the estimated driveline failure point will be.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon.
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