Canadian Timken differential

pinesdune · Post by **pinesdune** » February 6th, 2018, 10:38 am

Hi guys, I’ve been getting some work done to the AA since it went sub zero here the last few months, rebuilding the front and rear suspension and the steering but I finally tracked down a diff for my AA out in Dawson Creek BC, so I made the trip last weekend (1700 km one way) as well as a proper cab out in Edmonton, so it was a good trip.

Lots of folks have not seen one of these diffs, so I thought I’d post pics of the tear down of the one I just got home as well as the rebuild when I get started

flatford39 · Post by **flatford39** » February 6th, 2018, 1:30 pm

That ting looks pretty clean inside. Thanks for posting. Never saw the insides of one before.

Stakebed · Post by **Stakebed** » February 6th, 2018, 6:42 pm

flatford39 wrote: ↑
February 6th, 2018, 1:30 pm
That ting looks pretty clean inside. Thanks for posting. Never saw the insides of one before.

agreed - thanks for the pics! These had an open driveshaft correct?

marcel kristoff · Post by **marcel kristoff** » February 7th, 2018, 3:33 pm

Wow. I’m only 45 mins away from Dawson Creek. My AA has the same rear end. Can I ask who you bought it from?

pinesdune · Post by **pinesdune** » February 7th, 2018, 7:06 pm

marcel kristoff wrote:Wow. I’m only 45 mins away from Dawson Creek. My AA has the same rear end. Can I ask who you bought it from?

PM’d you

And yes Stakebed, they have an open drive shaft

1crosscut · Post by **1crosscut** » February 8th, 2018, 9:37 am

Nice to see the inside of something like this. I posted some pictures of the differential in my 29 AA a few years ago.
viewtopic.php?f=1&t=3844&p=20582&hilit= ... ive#p20582
Perhaps when you get yours all sorted out you could lay it out similar to what I did and we could combine them.
If someone could do the 30/31 bevel drive it would be pretty neat.

Stakebed · Post by **Stakebed** » February 8th, 2018, 5:03 pm

Since they had an open driveshaft how were they connected to the frame? just the leaf springs like modern trucks? I see a pretty stout bar that has been torched off in your pic...

pinesdune · Post by **pinesdune** » February 8th, 2018, 7:36 pm

Stakebed wrote:Since they had an open driveshaft how were they connected to the frame? just the leaf springs like modern trucks? I see a pretty stout bar that has been torched off in your pic...

I am pretty sure it connects the same way any other AA diff did, two 1” pins through the back of each leaf spring to the top of the diff, but without the torque tube and radius arms, it uses that large long arm as a stabilizer to the front spring mount on the drivers side, I’ll post lots of pics as I re assemble it, I just got some of the rear suspension parts back from the welding shop today and hope to be ready for reassembly some time next week. Here’s pics of an AA fire truck in a museum in Winnipeg that I was able to get so I had something to help see how it all fits together.

drtrcrV-8 · Post by **drtrcrV-8** » February 8th, 2018, 11:18 pm

Could you please furnish the gear ratios available for the Canadian rear axle gear sets when new(as well as the gear set you are working with)?

pinesdune · Post by **pinesdune** » February 9th, 2018, 11:43 am

Pinion gear has 5 teeth, ring gear has 31 on the BC diff, part number on the pinion is 33589, and 33838 on the ring gear

The gear set out of the truck as well as the parts truck both are 5-34 ratio and part number H1062 on the pinion and H1061A on the ring gear

I believe these two have Republic gear sets in them

drtrcrV-8 · Post by **drtrcrV-8** » February 9th, 2018, 7:59 pm

Pinesdune : Thank you for the ratios. I was curious how "deep" they would be. The only way to use them today in other than a "backroads only" or "yard truck" would certainly require some sort of overdrive, if not a combination of overdrives!! Although, with the open driveline it would certainly be easier to adapt than with the Ford torque-tube!!

pinesdune · Post by **pinesdune** » March 21st, 2018, 6:05 am

Truck update, I removed the rear suspension pivots and took them to a welding shop and had them and the bolts built up, as well as new bushings installed. Got the rivets I needed and finally managed to find time to get it all back together

Here's various pics I have collected so far for reference

This is a view into the housing from the axel end without the bearing race installed showing the internal seal and grease passage from the nipple on the axel

And some pics of the diff itself

I'll grab pics all along the way of the reassembly with reference to bearing numbers and seals, I'm not replacing the seals between the diff housing and the wheel bearings, the originals look fine and the fact that the outer wheel bearings are packed with grease, if a bit of oil gets in there it won't harm anything and I found a fit for the outer most seal. If anyone wants me to post any specific info as I go, just ask, have a good one.
Malcolm

Chris Haynes · Post by **Chris Haynes** » March 21st, 2018, 8:45 am

pinesdune wrote: ↑
February 8th, 2018, 7:36 pm

Stakebed wrote:Since they had an open driveshaft how were they connected to the frame? just the leaf springs like modern trucks? I see a pretty stout bar that has been torched off in your pic...
I am pretty sure it connects the same way any other AA diff did, two 1” pins through the back of each leaf spring to the top of the diff, but without the torque tube and radius arms, it uses that large long arm as a stabilizer to the front spring mount on the drivers side, I’ll post lots of pics as I re assemble it, I just got some of the rear suspension parts back from the welding shop today and hope to be ready for reassembly some time next week. Here’s pics of an AA fire truck in a museum in Winnipeg that I was able to get so I had something to help see how it all fits together.

Seeing pictures of this museum truck with the filthy dirty undercarriage reminded me of a trip to The Nethercutt Collection in Sylmar, CA. I was watching a woman who's job it was to keep the vehicles clean. Not only the topside, but on her cart of polishes and cleaners she had a creeper that she used keeping the underside dust free too.
http://www.nethercuttcollection.org/Visitor.aspx

pinesdune · Post by **pinesdune** » March 21st, 2018, 2:32 pm

Just more assembly pics,
Pinion assembly, notice the lip on the input shaft side, it receives a cork seal that seals the cover with the pinion shaft seal to the housing.

Pumpkin housing showing the Hyatt 7203 steady bearing and OR305 race for the rear of the pinion shaft as well as the retainer

Pumpkin assembled and bearing preloads set but I still have to check the tooth contact pattern.

Notice the bearing retainer rings, they are threaded allowing east side to side movement of the carrier assembly and preload adjustments. And the bearing caps, they are machined as a set with the housing, if you ever have one apart, try not to mix them up, yup, speaking as one who mixed them up haha

Stakebed · Post by **Stakebed** » March 22nd, 2018, 1:56 pm

Awesome job - thanks for the pics! Keep the updates commin.

aa-fords.com