Chicago Mark-E Aux Transmission

[Bryant]

Looking for information pertaining to the Chicago Mark-E Auxiliary transmission.
What I am looking for
Literature on installation
Original sales ads and the like
Part sources, part numbers
Rebuild specifications/tolerances
Information on manufacturing dates
Information on the round disk with the grease zerk pictured below.
And any other interesting things we can come up with.

[Bryant]

Bryant

[Michael Peternell]

Try Tim Morsher, I sent him a few, he went through them and with his transmissions we both ended up with one. The ones that have patent pending on the case have bearings that seem to be made out of unatainium. Bearings on the later ones are easier to get. Tim can probably explain better.
For what it's worth!
Mike Peternell

[Bryant]

This one doesn’t have the patent pending on it.
Says FO-1

hopefully an Obtainable model.
Bryant

[Bryant]

Also looking for a source for a transmission mount/brace. It probably wouldn’t be to much different than a Warford set up. Or any pictures of such a thing.

Bryant

[DanTreace]

This older post has pics of the bracket.


https://share.google/WOg6e4p3l45PrG8Wv

[Bryant]

Thanks for that. I was looking through older posts but did not see this one.
What a bracket! Has its own suspension.
Thanks Dan

Bryant

[Bryant]

Putting the round disk in place I realized it’s purpose. Giving just enough spacing so the brake equalizer doesn’t hit the transmission. Pump it full of grease for an oil seal.

Bryant

[Mark Gregush]

There are work arounds that eliminate that spacer by making your own equalizer. I have made a couple like shown in the link. Instead of the round rod with brake levers attached at each end, I just used flat bar with ends folded down. These allow the U part to be extended down to give more clearance for the transmission. I have not calculated the force applied but seem to work.
https://www.mtfca.com/discus/messages/3 ... 1384711491

[Bryant]

I actually like the simplicity of the spacer. However to get it installed I believe it will require studs. The through bolts would need to be to long to be able to get them to fit into the holes.

[Bryant]

Thanks for the link Mark! I like the idea.
Now for another issue…..

the running board brace is now in the way. Is this normal for Aux transmission installations? I just love a challenge.
It’s a 26 Tudor

Bryant

[RajoRacer]

Just a "heads-up" - the starter switch installed in your photo is NOT a good reproduction - it might work a few times, but the button rivet usually comes from together & launches the button or gets stuck engaging the power - not a good scenario !

[DanTreace]

Yes. Cutting the front running board channel is a must for these trans.

This older post has a great write up on install of several types, but not the Mark E


https://share.google/pQHtf6DScZ85zGlzd

[Bryant]

Just a "heads-up" - the starter switch installed in your photo is NOT a good reproduction - it might work a few times, but the button rivet usually comes from together & launches the button or gets stuck engaging the power - not a good scenario !

When I took the picture I thought to myself. “I wonder if anyone will say anything about my starter button” LOL! Yeah I bought that when I got the car before I joined MTFCA. I have read the stater button topics. Yet again I will be re engineering a part…. Unless a good original shows up on the classifieds.
Bryant

[Bryant]

Thanks again Dan! I guess I will sacrifice the part. But looking at the piece that is cut out I see a possibility to re-purpose it for a trans mount. It’s got that shape to it.

Thinking….

Bryant

[DanTreace]

Located an image of the Mark E support brace. Likely for the TT, but gives the idea of design.

[Bryant]

What a beauty! Where did that come from?
And is there more?

Bryant

[Bryant]

main input shaft. Zoom in for details! she has seen better days. Sad but true this hobby sometimes.
Looking for one in the classifieds but also talked to a friend of mine that’s a retired machinist.
He said “ I can make that”

A glimpse of hope
Bryant

[Bryant]

Received another chicago to try to build one out of two.
Some Notable differences. The black case is the F0-1 case and the rust colored one is the Patent’s pending F-1 case.

[Bryant]

The F0-1 case seems to be more robust. The input flange is thicker, the webbings thicker.

[Bryant]

The input bore on the F-1 case is a smaller diameter. This makes the preload collars different diameters and the input shaft bearing is taller but not as wide.

[Bryant]

The input shaft difference
F0-1 case has a removable input shaft that is about an inch longer to accommodate for the trans spacer. The bearing retainer that screws on to secure the bearing has a larger diameter due to the preload screws diameter difference. Then there is the bearing size difference.

I haven’t seen anything else that has stood out after that. Lot of good gears in the F-1 case so Iam happy to start getting this thing assembled.

[Bryant]

Iam thrilled to have a good main shaft!
I was worried I was out of business. It would have been near impossible with out great club members!

when in doubt just ask.
Bryant

[Bryant]

713D6BD7-5FBB-4160-B923-1340889B77FA.jpeg (65.55 KiB) Viewed 63 times

this logo appears on gears and shafts all over. Anyone recognize the logo?
I see letters F,I,G,H,C,T maybe…
Bryant

[TRDxB2]

In case you didn't get to this link https://www.mtfca.com/discus/messages/3 ... 1385651181