Dana 12 T-Case
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From: Emmett, ID
Dana 12 T-Case
As you all may or may not know, i have a 73 f100 4x4. I was curious about the transfer case and how easy, or hard; cheap or expensive it would be to rebuild it. Just in case your wondering, it's a dana 12 transfer case and it's very small, it only have either 4 low or 2 wheel drive at any time, it's not like the np t-cases with 4 high, low, and 2 high, low. Any info would be highly appreciated and feedback would be outstanding...thanks.
Last edited by Broken40; Apr 13, 2007 at 08:53 AM. Reason: mispelling.
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Think you ar talking about a single speed "Dana 21". You are right it is a very small case, and even though it is a gear driven one, it is not that desireable, and considered a little bit weak. I can say I have never broken one, partly because I have never run one.
I believe you would be time, and money ahead by upgrading rather than re-building. If you re-build you are only getting in return what you already have. For almost the same time, and money, you copuld find an upgrade 2 speed case, and be much happier with your modification.
I believe you would be time, and money ahead by upgrading rather than re-building. If you re-build you are only getting in return what you already have. For almost the same time, and money, you copuld find an upgrade 2 speed case, and be much happier with your modification.
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From: North Pole, Alaska
From my studies it will not be a simple xfer case swap. It seems the shaft between the tranny and xfer case is unique, and will fit no other case. I believe you would have to replace the tranny shaft before you could bolt up a new xfer case. I just scored a parts truck with the NP435 bolted to a NP205. Got a high pinion D44 to boot. I think this will be a much simpler swap than trying to mix/match to make the things fit.
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I had a 75 shortbed/ 360/ np435/ dana t-case, the transmission case its self had an entirely different bolt pattern then the np435 in my 79. The tail shaft is also a different size with different bolt pattern. I you are going to switch t-cases you are going to need the whole set-up or you might be able to get an adapter plate not sure. But from my experience you cant change the tail shaft either.
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From: Emmett, ID
well, that goes to show how the new stuff even in the 70's is just a pain in the rectal area....the dana that i have now still works, it just leaks and i have no idea on how to fix the leaks at all....if you all have any hints, please feel free to post, thanks for the in put all.
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Where does your t-case leak at....there are many possiblities of where it could be leaking from.
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From: North Pole, Alaska
My D21 leaks from the rear output as well. I found a complete rebuild kit to include bearings, seals, and gaskets. I think it was $95. Just do a "Dana 21" search. Or PM me and I'll let you know where I saw it.
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From: Emmett, ID
Here's where it leaks from.....
<a href="http://photobucket.com" target="_blank"><img src="http://i153.photobucket.com/albums/s231/rewsbroken40/t-case.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
<a href="http://photobucket.com" target="_blank"><img src="http://i153.photobucket.com/albums/s231/rewsbroken40/t-case.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
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You could fix that with a homemade gasket. Either use some gasket material, or cut one from a cereal box after the kids are done with breakfast. Just remove the cover (little plate) and use it as a template. Even a "corn flakes" gasket will last a decade or so.