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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

2 speed rear end identification?

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Old Sep 3, 2025 | 12:13 PM
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2 speed rear end identification?

I’ve just picked up a 1951 mercury M6 tow truck

its got the 2 speed vacuum rear end, I just want to know what company made it or any info on it so I can start to order parts

thanks in advance





 
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Old Sep 3, 2025 | 01:03 PM
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Eaton 1310 is the 2 speed axle Ford used in the F/M 6 trucks. You're going to have to share more pics of that beautiful machine. By the hood and grille trim it should be a 52. Very cool truck. Congratulations on your find. What parts are you thinking you need?
 
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Old Sep 3, 2025 | 01:55 PM
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Sweet thanks man

ive been trying to find info on it but there’s nothing about the heavier style trucks especially the mercs,

I’m going to need to do brakes all the way around and looks like I need a pinion seal, maybe the diaphragm on the diff too.
 
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Old Sep 3, 2025 | 01:59 PM
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Mercury trucks were exactly the same as Fords, just with Mercury badging. All the mechanicals will interchange. It might be easier to say Ford when ordering parts so no one is confused. You might end up with Merc sedan parts.
 
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Old Sep 3, 2025 | 02:06 PM
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I can’t find awhole lot of info on the eaton axle, form a couple other post on the forums I almost looks like a Timken 2 speed. Could I possibly be that?
 
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Old Sep 3, 2025 | 02:27 PM
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does this help at all?



 
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Old Sep 3, 2025 | 03:28 PM
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Add my welcome. Looks to me like you have the Eaton 1310. The place I’d suggest starting with it would be the Shop Manual. It has a whole section on the two speed axle. Another good reference would be to find an old Motors Manual on eBay or at one of the literature sellers. Same goes for the Shop Manual. Then if they don’t answer your questions, and after you have enough posts to do private messages, I’d be willing to make copies of these Eaton references and mail them to you.




Also, it’s pretty clear from your picture that your truck, like most others, has wheels with outer rims known as the Firestone RH-5°. Today just called widow makers, and not easy to find service on. The below pictures will help you see the joint at the middle of the rim that has earned them their reputation. Finding replacement wheels should be a priority. Stu




 
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Old Sep 3, 2025 | 03:48 PM
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You might take a second look at his wheels, Stu. They look like lock rings to me. The front looks pretty clear, and the rear I think I see rivets in the middle.


 
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Old Sep 3, 2025 | 03:50 PM
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The one rear I agree, the rest, hard to tell from the one photograph. Best to inspect, identify, and remedy as necessary.
 
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Old Sep 3, 2025 | 04:07 PM
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Thanks for the info I’ll start looking more into this

The front has the lock rings and the back are this split ones with the rivets
 
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Old Sep 3, 2025 | 04:31 PM
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Boy Wayne, your pic sure is clearer than what I see in the original pic on the phone. So hopefully all are locking side ring style. Stu
 
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