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Old 02-27-2018, 05:49 PM   #1
DMontague
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Default Mitchell in a 1928 AA

Hey guys, I'm working on my 28 AA and I'm thinking about putting a Mitchell it it. I was wondering if anyone else has done that and how they like it?
Thank you!
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Old 02-27-2018, 06:33 PM   #2
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Default Re: Mitchell in a 1928 AA

The local spare parts vendor here has done that. He drives that truck to swap meets all over the country (and it's a big country!)
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Old 02-28-2018, 08:48 AM   #3
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Default Re: Mitchell in a 1928 AA

I have a 28 AA with the 3 speed transmission and 5:1 rear. Before the Mitchell, I could do 25 mph, but the engine was screaming... I installed a 36% Mitchell and love it. I now can do 45-50 on the open road. I have two problems with it, My 20 mph brakes need some time to stop, and there are more bugs in my teeth. It's an open cab...

Frank
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Old 02-28-2018, 12:27 PM   #4
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Default Re: Mitchell in a 1928 AA

That's a beautiful truck!! How hard was it to install? I'm thinking about getting the 36 % over. Currently the truck tops out around 35 mph
David
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Old 02-28-2018, 05:42 PM   #5
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Default Re: Mitchell in a 1928 AA

It was much easier than I thought. I pulled the entire rear end out radius rods and all, left the springs on the frame. The new gear splitter comes with new torque tubes, front and rear, new drive shafts, and really everything you need. The only thing I did not like was the shifter linkage. They prefer to use a cable that attaches to the main transmission shift lever, but I did not like the looks of it. I had an additional problem of a large water pump being right in the way of the linkage. I chose to connect the Mitchell shifter to the gear box with a rod and clevis set-up and it works quite well.

Frank
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Old 02-28-2018, 09:34 PM   #6
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Default Re: Mitchell in a 1928 AA

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Frank are you using the worm drive rear end or something different?
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Old 02-28-2018, 10:06 PM   #7
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Default Re: Mitchell in a 1928 AA

5:1 ratio worm drive...
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Old 03-01-2018, 12:57 AM   #8
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Default Re: Mitchell in a 1928 AA

Quote:
Originally Posted by emf View Post
I have a 28 AA with the 3 speed transmission and 5:1 rear. Before the Mitchell, I could do 25 mph, but the engine was screaming... I installed a 36% Mitchell and love it. I now can do 45-50 on the open road. I have two problems with it, My 20 mph brakes need some time to stop, and there are more bugs in my teeth. It's an open cab...

Frank


The large AA brakes should stop you on a dime. The AA I worked on could stop fast enough to throw you through the windshield.
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Old 03-01-2018, 01:04 AM   #9
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Default Re: Mitchell in a 1928 AA

Quote:
Originally Posted by emf View Post
I have a 28 AA with the 3 speed transmission and 5:1 rear. Before the Mitchell, I could do 25 mph, but the engine was screaming... I installed a 36% Mitchell and love it. I now can do 45-50 on the open road. I have two problems with it, My 20 mph brakes need some time to stop, and there are more bugs in my teeth. It's an open cab...

Frank
How much does that fire truck loaded weigh? Going 50 with a full load I can imagine how difficult it is to stop.
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Old 03-01-2018, 07:59 AM   #10
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Default Re: Mitchell in a 1928 AA

The brakes may need further adjustment. I had them just right before the change, but now not sure. I'm going to go over them again to try for improvement. I need to get the truck weighed for sure. As soon as the weather breaks, first priority....
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Old 03-01-2018, 09:19 AM   #11
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Default Re: Mitchell in a 1928 AA

Firetruck has the same brakes as other AA's and they were designed to carry 1.5 tons...thus be able to reasonably stop 1.5 tons so unloaded it should do as tom said and put you into the windshield haha.
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