1931 AA Truck from the MAFCA Site

[truknut]

Model A Kid, do you have a spare jack handle that would be correct for a '28 AA available?

Rick

[ModelAkid]

I do not think I have an extra one, but if I find one I will offer here on this forum first. AA jack handles are very hard to find.

[Drew Mashburn]

ModelAkid:

Thanks for the reply. I'll bet the bed wood is original being that the entire truck is pretty much in it's original state.

What ratio rear end is in the truck? Is it the low-speed (6.0:1) or the high-speed (5.14:1)? What's the fastest speed that you've driven the truck?

-- Drew

[Hayslip]

Looks like M634B Phoenix Brown.

[truknut]

Thanks, I appreciate it.

Rick

[ModelAkid]

Drew, I'm pretty sure the rear axle has the standard ratio differential. I used to live about 50 miles from Sharon Wisconsin and I drove it to the "Model A Day" there a couple times. It seemed to comfortably cruise along at 40-45. I doubt I went over 50-55 with it, downhill. I do have an extra 1930-31 rear axle with the high speed gears. I was saving it in case I might want to put those gears in this truck sometime. It is the kind with the tag bolted to the case, so the case probably would not have to be changed to keep it "correct".

[Drew Mashburn]

ModelAkid:

Thanks for answering my question. I agree with you that it is probably the standard gear ratio rear differential what with the speeds you've described. It's cool that you have an extra high-speed rear differential. An easy way to check what ratio is in your truck is to remove the speedometer-cable at the driveline housing. This will allow you to remove the small speedometer gear that should have the ratio stamped into it's head.

Per chance, does your truck have the special after-market adapter at the rear of the transmission that allows the drive-line extension (jack-shaft) and the two U-joints to be removed without having to pull the engine and tranny or loosening the rear-end assembly and moving it backwards to accomplish the same thing?

-- Drew

[Drew Mashburn]

bump

[ModelAkid]

Drew, I'm not sure what that adaptor looks like. It sounds like something to make it a lot easier to change the clutch disk, something that would be done more frequently in a 1-1/2 ton rated truck. (which BTW seems like a very conservative weight rating).

[Drew Mashburn]

ModelAkid:

Yes, the adapter would allow access to the clutch-disc too without having to pull the engine.

I agree with you about the 1 1/2-ton rating being rather conservative.

-- Drew

[ModelAkid]

I have found the correct AA jack handle which will go with this truck.

[Chris Haynes]

Drew, I'm pretty sure the rear axle has the standard ratio differential. I used to live about 50 miles from Sharon Wisconsin and I drove it to the "Model A Day" there a couple times. It seemed to comfortably cruise along at 40-45. I doubt I went over 50-55 with it, downhill. I do have an extra 1930-31 rear axle with the high speed gears. I was saving it in case I might want to put those gears in this truck sometime. It is the kind with the tag bolted to the case, so the case probably would not have to be changed to keep it "correct".

That sounds like you have high speed gears in it allready. Without them your engine would be screaming at 35.

[Drew Mashburn]

ModelaKid:

In what kind of shape are the brakes? Does this old girl stop well?

Does the transmission shift well into all gears, including reverse?

-- Drew

[Drew Mashburn]

ModelaKid:

In what kind of shape are the brakes? Does this old girl stop well?

Does the transmission shift well into all gears, including reverse?

-- Drew

[ModelAkid]

Yes it stops very well and shifts as well as a AA Ford can. Definitely a way to practice your double-clutching skill. As I recall there may be some oil on the rear shoes so they would probably benefit from new axle seals and cleaned up shoes to stop even better. I may have done one side already; I can't remember for sure!