Rate Thread. Joined: Jan West Allis,Wi. Chev Nut. Doc, the problem with the is that the drive shaft and torque tube fit only because of the length. The speed you want to cruise at will be determined on what you feel is safe for your engine. In my experiance I am comfortable with RPM for the engine long distance travel.
Subscribe to Print or Digital! For more than a decade, installing an overdrive-automatic or manual transmission into a vintage Mustang has been a popular upgrade. It's more common these days, but some people still aren't convinced of the numerous benefits of such a conversion. If you could only do one upgrade to your vintage Mustang that's a fairly nice driver and is reasonably complete, installing a transmission with an overdriven top gear is the single best thing you can do to improve the car's overall usefulness.
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