AA timken diff

Pinesdune

Pinesdune

Senior Member
Hi guys, started work on the next project. I'm starting on the diff of a 29 Canadian AA with a timken rear end. A couple questions, does anyone know if there's a ring and pinion assembly available for this application? I've got two sets but one has broke teeth and the other (tho usable) is getting enough wear on the drive side. The ring gear measure 11 1/2" across, 8" centres on the bolts and has a ratio of 34-5 tooth count, (I think that's 5:32) and has a stamping number "H1061A" also "Republic"
0cb26bf73c8a382c1041e11686b5cda2.jpg

The ratio isn't as big a concern as finding one that fits.

Also the Hyatt bearing used on the rear side of the diff to steady the pinion is part number 7203 with an external race "OR406". I doubt that will change up or be a serviceable bearing outside of NOS, just wondering about using a high speed ball bearing instead and thoughts?


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Bob C said:
That's a 6.8 : 1 gear set . The gear is part # AAC 100164 and the pinion is AAC 100166.
Click to expand...


Thanks for the part numbers, I might be able to find something with those rather than a replacement republic gear number. Wow, my math needs work, that wasn't just a screw up...it was almost biblical. Note to self, next time find a pen/paper, calculator, or just someone who knows what they're doing!


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I am also doing a little work on this same rear end. Is there a parts list available? I’d also like to see an exploded diagram of the front assembly.
 
I've got these pictures but the numbers are hard to read.

Bob
 

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The 1929 AA Canada has a Timken diff and I have been told the crown wheel and pinion from a Austin or Morris FG? from the sixties will fit with some machining and give a top speed of about 48MPH.
 
Is that the split case Timken used in the American AAs late 29 and up? If so the High Speed ring and pinion is the same used in 1941 White military trucks.
 
My parts book has 6 pages covering the AAC with 9 illustrations. It covers the wheels, drive shaft, E brake, chassis, universal, rear axle & special transmission.

Manuel in Oz
 
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