The Ford Barn - View Single Post - coupling shaft assembly on AA Truck with 4 speed transmission Transmission

Joe K · 05-15-2026, 07:38 AM

I have a loose "diamond shaped" reinforcing plate AA-4808, and there is no drilled/tapped hole for a grease zerk.

My '28 A-4001B rear axle has a zerk (alemite) back about where the speedo cable is attached - perhaps 3" back from the U-joint. A lot of grease covered in dirt covering all the bolts on the AA-4520 coupling cover, but no evidence of a grease zerk.

My November '28 Parts Price List shows the same cover both between the 3 speed transmission and the dual high/connector and the diamond A-4808 plate and the axle. This, incidentally is the same cover used on the Model A car called out as "Order A-4520" (car component) in the PPL.

My later 1932 Parts Price List (available reprinted) shows what appears the same U-joint cover labeled "BB-4520." No mention about ordering the car U-joint cover. So it could be a distinct BB change. I have a couple of loose 4 speed trannies here, but neither have the U-joint cover. The bolt circle could be examined to see if it lines up with a car 4520.

The 32 PPL also shows the car cover as A-4520B or A-4520C differentiating between the "unevenly spaced" bolting and the "evenly spaced" bolting. The "equally spaced" version C also references "old No. AA-4520". The Model B covers reference as B-4520 and have only four bolts.

Ford is pretty good in the PPLs about showing parts in "groups" - one would expect the Zerk, should it be used on the 4520 cover to be shown in the listing. There is none for either.

So as others have said - grab a handful of grease and push it in during assembly.

Neil discusses the "connector shaft" in some detail. Perhaps the best pix of the connector/axle transition is shown at https://aafords.com/aa-chassis/aa-48...ft-4-speed-aa/ The last pix of the page shows AA-4802 B/C "Installation @ Torque Tube."

Joe K

05-15-2026, 07:38 AM	#4
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 5,019	Re: coupling shaft assembly on AA Truck with 4 speed transmission Transmission I have a loose "diamond shaped" reinforcing plate AA-4808, and there is no drilled/tapped hole for a grease zerk. My '28 A-4001B rear axle has a zerk (alemite) back about where the speedo cable is attached - perhaps 3" back from the U-joint. A lot of grease covered in dirt covering all the bolts on the AA-4520 coupling cover, but no evidence of a grease zerk. My November '28 Parts Price List shows the same cover both between the 3 speed transmission and the dual high/connector and the diamond A-4808 plate and the axle. This, incidentally is the same cover used on the Model A car called out as "Order A-4520" (car component) in the PPL. My later 1932 Parts Price List (available reprinted) shows what appears the same U-joint cover labeled "BB-4520." No mention about ordering the car U-joint cover. So it could be a distinct BB change. I have a couple of loose 4 speed trannies here, but neither have the U-joint cover. The bolt circle could be examined to see if it lines up with a car 4520. The 32 PPL also shows the car cover as A-4520B or A-4520C differentiating between the "unevenly spaced" bolting and the "evenly spaced" bolting. The "equally spaced" version C also references "old No. AA-4520". The Model B covers reference as B-4520 and have only four bolts. Ford is pretty good in the PPLs about showing parts in "groups" - one would expect the Zerk, should it be used on the 4520 cover to be shown in the listing. There is none for either. So as others have said - grab a handful of grease and push it in during assembly. Neil discusses the "connector shaft" in some detail. Perhaps the best pix of the connector/axle transition is shown at https://aafords.com/aa-chassis/aa-48...ft-4-speed-aa/ The last pix of the page shows AA-4802 B/C "Installation @ Torque Tube." Joe K __________________ Shudda kept the horse. Last edited by Joe K; 05-15-2026 at 08:05 AM.