What are the recommended shifting speeds of the 31 Model AA with the 4 speed and the 7.25 gears in the rear-end?
Thanks so much.
Can anyone tell me the shift speeds for the 4-speed?
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Buyitsmart
- Posts: 18
- Joined: November 9th, 2014, 5:12 pm
- Model Year: 1931
- Location: Longwood, FL
Can anyone tell me the shift speeds for the 4-speed?
Ken in Central Florida / 1 Model A is good / 2 Model A's are better / 3 Model A's are normal
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Bob C
- Posts: 1442
- Joined: April 24th, 2003, 11:50 am
- Body Type: Mail truck, Stake tr
- Model Year: 1931
- Location: SO CAL
Re: Can anyone tell me the shift speeds for the 4-speed?
30-31 only came with 6.6 or 5.14 : 1
Bob
Bob
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KimVanOrder
- Posts: 753
- Joined: August 11th, 2013, 4:25 pm
- Body Type: 82-A Platform
- Model Year: 1928
- Location: Hamilton, Mich.
Re: Can anyone tell me the shift speeds for the 4-speed?
I don't know if there is a "recomended" speed. I'd just rev it up and shift. 
Do it by ear. Soon as things start to sound really wound up, SHIFT!!! (your ground speed will be slow with the low rear end gears you have). 
Do it by ear. Soon as things start to sound really wound up, SHIFT!!! (your ground speed will be slow with the low rear end gears you have). KVO
Dec. '28 AA
Dec. '28 AA
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Buyitsmart
- Posts: 18
- Joined: November 9th, 2014, 5:12 pm
- Model Year: 1931
- Location: Longwood, FL
Re: Can anyone tell me the shift speeds for the 4-speed?
You are right. I see that in a previous thread now.Bob C wrote:30-31 only came with 6.6 or 5.14 : 1
Bob
I believe the truck has the 6.6
Isn't there a way to determine what gearing you have in the rear end?
I think you are supposed to take a sparkplug out and mark the tire position on the ground and go one complete revolution of the tire and count the engine revolutions?
Something like that?
Ken in Central Florida / 1 Model A is good / 2 Model A's are better / 3 Model A's are normal
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Chris Haynes
- Posts: 2203
- Joined: September 7th, 2003, 5:18 pm
- Body Type: 82A
- Model Year: 1930
- Location: Camarillo, CA
Re: Can anyone tell me the shift speeds for the 4-speed?
Buyitsmart wrote:Bob C wrote:Isn't there a way to determine what gearing you have in the rear end??
Unscrew the speedometer drive out and look on the gear. The ratio will be stamped on it.
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1930artdeco
- Posts: 10
- Joined: August 4th, 2014, 12:20 pm
- Body Type: n/a
- Model Year: 1930
- Location: Oakland, ca
Re: Can anyone tell me the shift speeds for the 4-speed?
This is how dad explained the 4 speed to me. Start engine, engage 1st gear, let out clutch peddle, truck moves, shift into 2nd. That granny gear with those steep gears will pull anything. You may want to start out in 2nd so you will be able to go more than two miles and hour before you shift.
Mike
Mike