Question...

dyoungs · Post by **dyoungs** » April 23rd, 2006, 6:19 pm

Ok MikeG....
I was going thru you website. I looked in you AA pictures. What is the difference in the trucks that only have a single rear wheel not the duals? I thought the duals in the rear is what makes it a AA vs a pickup?

Thanks
Dave

Post by **mikeg** » April 23rd, 2006, 7:30 pm

Hi Dave,

I'm pretty sure the AA designation is due to the heavy duty frame, axle and 1.5 ton rating and not specific to the dual rear wheels.

Ambulances, delivery trucks and express (service trucks) among other models like that had single rear wheels.

Neil Wilson · Post by **Neil Wilson** » April 24th, 2006, 9:05 am

The AA prefix was used on any part which was unique to the 1-1/2 ton chassis. Any part used on the AA truck which was also for the A, carrier an A prefix.

dyoungs · Post by **dyoungs** » April 24th, 2006, 9:28 am

Neil,
On that note how about the engine serial number? A vs. AA

Dave

Neil Wilson · Post by **Neil Wilson** » April 24th, 2006, 1:14 pm

Dave,
An “A” or “AA” prefix was a part of the engine number and there was a star on each end. For 1928 through October 1929 the “AA” prefix identify engines with a stronger clutch spring. Starting November 1929 the “AA” prefix identified engines with a four speed transmission.
Note: for a three month period starting mid February 1928 (with engine number A-26268) through mid May 1928 (with engine number 136,000 approximately) the AA truck clutch spring was the same as the Model A. During this period the engine number had the “A” prefix. Refer to the “Service Letters” dated February 23rd and May 15th 1928.