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About Us / Contact is an online store that specializes in maintaining 3,4,5 and 6 speed manual shift vehicles, so if you're interested in converting an automatic transmission to a manual transmission you've come to the right place!

4 Speed Conversions is a subsidiary of Youngs Cars and Parts, LLC located in Southington, Ohio. The manager of the site, Russ Young has been a mechanic for over 40 years and has a passion for Project Cars, Restoring Vehicles and Muscle Cars.

Russ has been researching General Motors conversion kits and parts since the inception of in 2008, many people find him to be helpful in answering their technical questions and suggesting the proper parts to make a smooth conversion happen, ultimately making 4 Speed a leading & trusted authority site.

We carry New Old Stock, Used and Reproduction parts at great prices. Information is Free!

Russ is dedicated to helping you with your questions and his personal advice if needed. He can be reached at 330-307-5434 or email

Please leave a message if he doesn't personally answer. Although cars are his passion, it is not currently his only job, so please be patient and he will return your call as soon as possible.

We usually ship orders the same day or next day depending on the time your order is placed excluding Sundays and holidays.