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rotorwrench · 10-06-2019, 10:05 AM

Eaton and Timken Detroit as well as others, developed the two speed rear axles way back there in the model T era but manufacturers were still using a lot of chain drives on heavy trucks and over under boxes on lighter trucks. It was cheap and easy to change sprockets so it took a while before they became more popular in the 30s.

10-06-2019, 10:05 AM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,511	Re: First 2 speed axles Eaton and Timken Detroit as well as others, developed the two speed rear axles way back there in the model T era but manufacturers were still using a lot of chain drives on heavy trucks and over under boxes on lighter trucks. It was cheap and easy to change sprockets so it took a while before they became more popular in the 30s.