1930 Model AA Cant Get Her Over 25 MPH

I thought I was going faster than it read. Why is it out by 15MPH.

Could it be the wrong speedometer gear set (the driven gear is stamped with the ratio) or just a bad speedometer?
 
I enjoyed reading through all the posts with everyone trying to help determine why the truck wouldn't go faster than 25 mph and with all the fine tuning advice post after post, this should be required reading for any new Model A'er to learn how to diagnose problems - they will learn a lot of helpful info. Then at the end we find it's a faulty speedometer. Sort of the "Why won't my Model A start?" story and after multiple good Samaritan's advice of fiddle with this and fiddle with that, someone discovers they forgot to turn the gas on or key on. ha As a Model AA owner myself, if Kane couldn't tell the difference between going 25 and 50 in a AA, he must have some really good shocks! When I get mine up to 50 you really know it's hauling A _ _ and bounces all over the road.
 
KANE MCAFFER said:
So my wife tells me about this application you can get on your iPhone. A speedometer. She says it works exactly accurate. I'm like ya right...... So I try it. I turn it on and go for a drive in our brand new mini van (don't tell anybody I have one of those), and it id dead accurate!!! So I thought I'll try it in the Model AA. Turns out my speedometer is out to lunch. When it reads 35 MPH I'm actually going 50MPH. So I must have the high geared diff. I thought I was going faster than it read. Why is it out by 15MPH. Again running 6.50x20 all the round. As odd as that is this is good news, plenty of speed for me!!! Still chugs gas though, and I'm pretty sure the gas gauge is ok, but.........
Click to expand...

Way behind on reading all of this... but thats classic.

How did you make out in the end? Did you ever get her running like a top?
 
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