06-22-2016, 04:17 PM

Faustmill

Member

Join Date: Apr 2003

Location: Chevy Chase, MD, USA

Posts: 68

Is there an overdrive for 4 speed trans?

67 GTO with Muncie 4 speed and 3:55 rear.
I am turning 4000 rpm at 70 mph and 3500 rpm at 65 mph. These rpms are just too high for me on longer highway cruises. I think the car would be lot more comfortable at, say, 2500 rpm at 70 mph. Is there any transmission bolt-on gear box that would give me a high/low range and still allow me to keep the stock Muncie 4 speed? Thanks.

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