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rotorwrench · 07-18-2021, 11:23 AM

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It is an over/under aux transmission that will provide a lower gear starting out and work up to high gear. The 28/29 AA trucks only have a 3-speed. The later 30/31 AAs have the 4-speed.

07-18-2021, 11:23 AM	#6
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: 1928 AA flat bed truck with rare sign Sponsored Links (Register now to hide all advertisements) It is an over/under aux transmission that will provide a lower gear starting out and work up to high gear. The 28/29 AA trucks only have a 3-speed. The later 30/31 AAs have the 4-speed.