Wondering if anyone has information on the gear ratios for the 2 speed Eaton rear ends for Ford 41-52.

Would there have been stamped numbers on the case? In the past I have not seen any however I am looking at one that does have some numbers on it.

thanks guys.

 

Specific to the Eaton 1350 axle used during those years I find the 5.83/8.11 combo in the 1946 dealer handbook, and in the 48-52 chassis catalog for that axle I find optional 5.83/8.11 and 6.33/8.81 ratios. Stu

 

So I have a 6.667 in my truck now and would like to have a higher highway ratio, I am assuming the 5.83 would do the trick but how to tell what ratio on an axle still on the truck in the field is the issue.

Mark

 

I’m probably like you and am used to the Timkens in my trucks having the ring/pinion teeth counts stamped into the housings. I’ve been on my own search for two speed axle info and believe I followed a Google Image trail that showed an Eaton with a letter casting that told the gear set in that Eaton two speed. I’ve also got an Eaton servicing brochure but it doesn’t say a thing about coding of gear sets. If you find an axle you’re welcome to have copies of these Eaton brochures. If nothing else is found to tell which gear set, there’s the spin a wheel method by counting drive shaft revolutions.




If you don’t already have an Eaton lined up, I’ll mention the Timken-Detroit that I picked up a couple months ago. I’m still investigating it too, but know from a brochure I found that optional gear sets for it are 5.27/7.06 and 5.64/8.16. This is a late 1930s axle having a manual shift lever. It came along with the Dayton adapter set that our friend Geno C told us about. There is a similar axle now for sale on eBay.




This is the Ebay listing in Fort Dodge, Iowa. Only drawback, it’s under a Chevy. Stu

https://m.ebay.com/itm/1951-Chevy-Tr...53.m1438.l2649

 

TrugDog, here are the only numbers I find on the diff. Make any sense?

26003 and 137688

 

Missed this post, sorry. The Timken is interesting but wrong axles due to Chevy hardware. I have found several 2 speeds with the wrong or low ratios so far. Like to find one with the higher and manual shift.

 

Those numbers don’t say anything to me, but I’ll do some looking.

The Timken-Detroit I got has Daytons which I’m okay with. I guess hubs can be swapped, but then there’s finding compatible parts. Stu

 

On my '40 Eaton, the ratio is stamped on the assembly that bolts to the front-side of the axle- at 12:00.

 

Thanks STU, I learn a lot just reading your posts.

 

Thanks this is very helpful.

 

This is what is on the axle I am looking at. Numbers may mean 6.89?

 

1948/52:

 

Is that a decimal point in the 6.89? If so, and looking at the spacing of the digits, it could be the ratio. But otherwise they look like serial numbers or other model codes. But I don’t find them online. Stu

 

Thanks Stu, I will keep looking. Something will turn up.

 

They sure had enough springs on that axle didn't they.