1930 Model AA Cant Get Her Over 25 MPH

[juke joint johnny]

As Kane keeps saying 3rd gear!!! Could he have an earlier AA with the 3 speed transmission? Maybe the paperwork calls it a 1930, wouldnt be the first time
Can we see some pictures ?

[sturgis 39]

The three speeds came with the double high transmission. This the auxiliary transmission behind the three speed. It is actually an under drive transmission. It is operated with a foot pedal on the floor. When the axillary transmission is in high gear the drive is direct.
Someday, I want to mount the axillary transmission backwards and make it an over drive.

I did not know that Mitchell made an over drive for "AA" trucks.

I thought the "AA" trucks were slower than cars and never went much over 25 mph.

The three speed transmission is the same as a car three speed.

It is snowing here today.

[modeleh]

If you have a 3spd and a dual high, with the rocker pedal, perhaps the aux trans is in underdrive. Do you have a bevel gear rear or worm drive? If it it worm drive it will be a low speed rear and should have a dual high trans mounted aft of the main gearbox. Your options will be slow or slower.

[spdway1]

Originally Posted by CarlG

What are you calling 3rd gear? In an AA with a 4-speed transmission, 3rd is not "High" gear. It would be equivelant to 2nd in an A with a 3-speed transmission, notwithstanding the rear end ratios. Back in the '50s I had an AA 280A with a 4-speed transmission and on flat ground had no trouble cruising at 50-55 (in 4th gear). I was a teenager then so it was usually "pedal to the metal" wherever I went.

(Tom beat me to it!)

Do you mean Pedal to the WOOD?

[kp]

Maybe I missed something from above post ,did anybody mention checking the throttle opening to be sure its opening fully ,mash the pedal to the 'wood ' and check while its down to see if the throttle is opening fully.

[ronn]

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remove the ball and chain and set her free......

[ctlikon0712]

Check to make sure that your advance lever on the collumn moves that advance plate in the dist. all the way advanced to the counter clockwise position...... looking down from the top. The advance tab lever should be all the way up against the stop in the distributor's window.

[flatford39]

30 and 31's were 4 speed transmissions. I have a feeling you may have a very early 30 with the 3 speed trans and the hi lo underdrive. Are there two pedals sticking up behind where your right foot rests??? If so that is the underdrive and I bet you are in creeper mode. You need to depress the pedal with the clutch in to get to normal driving. You should be able to do 35 MPH to 40MPH even with the low speed rear.

[Bob C]

The 4speed came out in Oct '29.

Bob

[flatford39]

Originally Posted by Bob C

The 4speed came out in Oct '29.

Bob

Yeah..but he talks about when he is in 3rd gear he can't get over 25MPH. Maybe he has a 29 and not a 30.

[Mike V. Florida]

Originally Posted by ronn

remove the ball and chain and set her free......

I thought this was about a truck not a wife?

[Bob C]

OK Kane how about some pictures

[BILL WILLIAMSON]

Tip # 17-Just in case it an exhaust flow problem, hook up a vacuum guage and slowly keep speeding up the motor and see if the vacuum gage gradually goes to zero. Sometimes even carbon deposits in the muffler can cause restriction. If mouse nest or carbon is suspected, lean the complete exhaust system, outdoors of course, on a 45 degree angle, wih tail pipe up. Slowly pour diesel into tail pipe unil it trickles out header pipe. Light the diesel at the lower end with a piece of newspaper. Once lit, it will "draw" like a chimney. Keep adding diesel from upper end until the whole thing is glowing RED! Cool it off and put it back on.
Roar the engine & you'll be surprised how much soot, scale & crap comes out that has accumulatd for 80 something years!! A friend did this and increased top speed from 52 MPH to 62 MPH! It's kinda' like when we're sluggish and have to resort to a laxative! Bill W.

[juke joint johnny]

BIll I like your tip *17
You have a lifetime experience of these cars & still remember how things were done in the old days with no money, tools or electricity!!!
To some peoples surprise these remedies actually worked and if they didn't work we wouldn't have so many Model A 's left in the World today.
Some people get so technical you would think they are talking about a Nasa rocket not a basic car from the 1920's
You should write all these tips down in a book or website or something so we can refer to them in the future.
Give the Rat terrier a pat from me
John Cochran

[pat in Santa Cruz]

Bill, I like the sound of this. I'm working on a 25 Buick right now with a restricted muffler, probably a rat nest judging from the smell of the exhaust. I'm gonna give this a try. The other alternative is to shell out bucks for another muffler which is no fun. I have lots of old diesel around and besides, playing with fire always was something I enjoyed.

And along the line of looking for other causes: It was mentioned above that Kane should check the throttle for full opening. That's a good tip. Bent throttle brackets are common, and can result in incomplete opening as well as a refusal to fully closing to idle.

[BILL WILLIAMSON]

Originally Posted by pat in Santa Cruz

Bill, I like the sound of this. I'm working on a 25 Buick right now with a restricted muffler, probably a rat nest judging from the smell of the exhaust. I'm gonna give this a try. The other alternative is to shell out bucks for another muffler which is no fun. I have lots of old diesel around and besides, playing with fire always was something I enjoyed.

And along the line of looking for other causes: It was mentioned above that Kane should check the throttle for full opening. That's a good tip. Bent throttle brackets are common, and can result in incomplete opening as well as a refusal to fully closing to idle.

DON'T EVEN THINK ABOUT USEING GASOLINE!!
I don't want to read a headline saying, "COASTAL MAN BUILDS BOMB IN A 1925 BUICK MUFFLER!"
Bill W.

[marc hildebrant]

Is there any update on 3rd gear vs 4th gear ?

Marc

[spdway1]

Not yet Marc, we are now making muffler bombs with petroleum products, LOL!

As Toby Keith sings - "I love this bar"

[jerry of whidbey]

my AA with duals will do 40 and then some but I never do more then 40 check the cav valve to make sure it is open far enough when you get to top speed

[sturgis 39]

Originally Posted by flatford39

Yeah..but he talks about when he is in 3rd gear he can't get over 25MPH. Maybe he has a 29 and not a 30.

Some modern truck drivers consider high gear in a four speed as third gear. Some four speed shift nobs have first labeled "LO" and the others labeled as 1,2,3. He might have us all confused.