61 rear end leaking
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Mountain Pass
Joined: May 2018
Posts: 114
Likes: 3
From: Webster
61 rear end leaking
So I have discovered that my new purchase (61 F100 stepside 233 six, three on the tree) has a bent drive shaft. I'm guessing that is what has caused my newest problem, rear end leaking oil (bad). Looks like it is coming from where the yoke goes into the rear end, My question what is the problem and how do I fix the leak? Also are any other year Ford pickup drive shafts interchangeable with mine?
Last edited by slabhunter; May 19, 2018 at 10:11 AM. Reason: Add another question
Lead Gopher
Joined: Aug 2012
Posts: 10,057
Likes: 1,612
From: Seattle
There is a pinion seal where the yoke sleeve goes through the housing and connects to the drive pinion. The seal is likely part or all of the source of the leak. To replace it you will need to pull the drive shaft (replace it since it is bent) and then there is a center nut holding the yoke flange on. You'll have to hold the yoke from turning while you remove the nut. They are very tight to get off since they are a high torque nut. Once you remove the nut and pull the yoke out then you can get a seal puller or small pry behind the seal and pop it out. Since the drive shaft is bent I'd also inspect the yoke closely since a bent yoke will ruin a new seal. But, tap a new seal in and replace the yoke and nut.
You might want to consider a 1961 shop manual for your truck, like this. It has torque specs as well as the write-up and pictures. Overall, I rate them well worth owning. Heck, I don't own anything but 1966 and I still have a 1961 manual....:-)
Hopefully nothing inside the differential got bent in the process of the drive shaft bending.
Chad
You might want to consider a 1961 shop manual for your truck, like this. It has torque specs as well as the write-up and pictures. Overall, I rate them well worth owning. Heck, I don't own anything but 1966 and I still have a 1961 manual....:-)
Hopefully nothing inside the differential got bent in the process of the drive shaft bending.
Chad
Lead Gopher
Joined: Aug 2012
Posts: 10,057
Likes: 1,612
From: Seattle
Mine covers Ford and Mercury trucks so it's a bit less common, but for just Ford or both they are on eBay. You can get a paper manual or a CD
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=1961+ford +truck+shop+manual&_sacat=0&LH_TitleDesc=1&_osacat =0&_odkw=1961+ford+truck+shop+manual
Make sure you get one that covers 100 - 800 - some of them start at 850 and go up from there, which wouldn't be what you would want, of course.
Chad
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=1961+ford +truck+shop+manual&_sacat=0&LH_TitleDesc=1&_osacat =0&_odkw=1961+ford+truck+shop+manual
Make sure you get one that covers 100 - 800 - some of them start at 850 and go up from there, which wouldn't be what you would want, of course.
Chad
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Mountain Pass
Joined: May 2018
Posts: 114
Likes: 3
From: Webster
Great information guys!!! Ill be ordering shop a manual today....Any thoughts on a replacement drive shaft. I think I have found someone local that makes them but I haven't talked to him yet. I thought there might be another year that would be interchangeable.
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