Output Shaft Seal

T

tflyer

New member
I have read thru all the threads that at the top. I did not find what I was looking for, that doesn't mean that it isn't there though. I May have just missed it as there is a ton of information to go thru.

I have a 1973 travelette, 392fi, 727 originally 4x2. I have converted it to 4x4 with a d44hd front and aam 10.5 rear, divorced NP205 tc, shortened drive shaft between transmission and tc. Disc brakes all around.

I need to find a part number for the seal that goes in the tailshaft around the yoke. I have a guy rebuilding my original 727, he has done other work for me and has done a lot of chrysler 727's. However this is his first IH 727. In my reading I see that the tail shaft if IH specific on these trannies. He has found two seals so far, but one fits the yoke and is to big for the tail shaft. The other fits the tail shaft, but is to small for the yoke. I have tried to do as much research as I can, but I have struck out.

Would you experts have a part number on this seal? Please let me know if you need any more information.
 
Did the yoke on the transmission change with the install of the transfer case? Can you get us dimensions of the seal you are looking for? Measure the o.d. Of the yoke and the I.d. Of the tail housing plus how thick the seal can be. From there we can try and source one for you or May already have one in stock.
 
It is the original tail shaft housing and original yoke. I will try to get those measurements for you today. Thank you for the help.
 
Based on the information I read in the all the transmission information the tail shaft and seals are different for a Scout and a pickup/Travelall. The Scout has a married tc and the pickup has a divorced tc. Only the 2wd drive Scout had the same tail shaft as the pickup/Travelall's. Will those part numbers still work. I should have the measurements today. Thanks
 
Jeff,

here are the measurements:

yoke od: 1.566 inches

tail shaft housing id: 2.451 inches

thickness of seal: .48 inches ( I assume that a 1/2 one will work fine)

thanks again for all the help.

I am surprised that micheal or scoutboy don't know this one off the top of their heads.
 
I've located one and am having my supplier bring it in. I want to see it and verify it is the correct seal either way. Looking at about $17 for it plus shipping. You can call us later today to order it. If its wrong we'll keep searching.
 
Thank you Jeff,

while I am at it, I will need to order a few other parts also. I will call later today.

If it does turn out to be correct, can you go ahead and post the part number here for anyone else to reference.

Thanks again.
 
Sorry I'm late to the party. (oops omitted my earlier comments regarding the p/n supplied by scoutburton)

as already noted, there are a number of extension/adapter/tail housing differences encountered between 727 equipped vehicles depending on make and even vehicle platform within said makes. There's a long shaft housing found in many chrysler vehicles and also ihc motorhomes, there's a married t-case adapter housing for sii 4x4's, there's a short shaft housing for ihc d-series 4x4, 4x2 and sii 4x2's, and then there's a couple for amc rigs. The online parts sources make no distinction when it comes to the extension housing seal as it pertains to ihc vehicles with a 727. The numbers I've seen listed for ihc are national 7300s, (seal only) and national 5206, (seal and bushing kit). By visual looksee, these seals appear to be correct for the common long shaft housing found in many chrysler vehicles as well as ihc motorhomes. At this point, I'm thinking that those broadly listed part numbers are incorrect for both the sii 4x4 or the d-series housing variations. Jeff already has the sii 4x4 seal available for purchase, so that one is no mystery. It will be interesting to see what he is able to determine with regards to the correct seal for the d-series apps.
 
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Just for future comparison sake, what follows are the attributes of the seal part numbers discussed previously. All measurements are in inches:

p/n 472164, 17386, 17387...width .313, od 2.506, shaft 1.75, bore 2.502 - for the '72 and up 4wd sii with tf727 adapter housing and married t-case with bolt on yoke.

P/n 7300s, 16725...width .835, od 2.506, shaft 1.688, bore 2.502 - for many chryslers plus the ihc mh chassis with tf727 and slide in yoke.

P/n 15620...width .500, od 2.445, shaft 1.563, bore 2.441 - for '72 and up d-series (2wd & 4wd) plus '72 and up 2wd sii's with tf727 and bolt on yoke.
 
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Thank you for the reply. Jeff is sending me a seal based on the measurements that I posted. They look really close to what you posted. Hopefully he will post the part number up here and we can compare to see if they match. That way it will help anyone in the future and we can add it to the growing list of known part numbers. I was really surprised that this has not came up before. The parts stores around here are terrible to try and research parts. I really appreciate everyone's help and these forums.
 
That's good. Yep, the parts biz has been a shell of its former self for years. Its driven by what parts move the fastest and how many packages of beef jerky or pine tree air fresheners you'd like to buy. Outside of this niche community, there isn't much demand for parts that are IH specific. One online source that I commonly use to do parts lookups, and is generally pretty accurate when it comes to ihc, does in fact have all three of the previously discussed seals listed inside the ihc grouping, but they aren't categorized correctly. The one that comes up under "auto trans output seals" for all sii's and d-series is the one that is meant for most chryslers and the ihc mh chassis. That's the most common one by virtue of the chrysler influence. That site and most of the others are operating out of the misguided assumption that the tf's installed in sii's and pick-alls have the type of extension housing that accepts a slip-in yoke. As you know, they both have a bolt-on yoke. The 4x4 sii is the real odd ball because of the married t-case. The rear yoke isn't attached to the back of the trans. It's bolted to the t-case, but the sii adapter housing still requires a seal nonetheless.
 
Thank you Jeff, that seal is correct and works. The number off the seal for anyone's reference is cr15620 and I am sure that Jeff will be able to get this seal for anyone that needs it. This is for the 727 in the pickall's and 2wd scouts. Thanks again for all the help.
 
Glad Jeff was able to hook you up. That is the same part number that I encountered in my searches, so I've updated my earlier comparison post accordingly.
 
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