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willysmjeeps.com :: View topic - Transfer Case rebuild issues
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Transfer Case rebuild issues

 
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CapnDan
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Joined: Feb 24, 2009
Posts: 45
Location: Victoria,Texas

PostPosted: Fri Apr 19, 2024 7:59 pm    Post subject: Transfer Case rebuild issues Reply with quote

I am rebuilding the transfer case in my 54 M38A1. Has anyone had this problem:

I have installed a new bushing in the rear output shaft that the front output gear shaft fits in. I got it driven in with a piloted bushing driver. The inside diameter of the newly installed bushing checked .626 diameter without having to ream it. This is acceptable based on the .626-.627 called out in the repair limits of TM 9-8015-2 chapter 18 paragraph 271d. My new front shaft pilot end measures about .6235. After putting it all back together in the case I am having difficulty rotating the front shaft independently of the rear shaft.
This is with the front output shaft clutch gear in the two wheel drive position. I cannot get turn the front independent of the rear just gripping the shafts by hand. If i put the yokes on the shafts then I can turn them but it is pretty tight. I am using 90 weight gear oil for assembly lube. Is that a normal condition? Will it stop sticking after I fill the transfer case with gear oil?
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Danny L. Harris
aka Bubba
1954 M38A1
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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 16286
Location: Wisconsin

PostPosted: Sat Apr 20, 2024 3:51 pm    Post subject: Reply with quote

Have you reviewed the Rick Stiver's Dana D-18 transfer rebuild pages or the Novak's D-18 rebuild page?

https://www.cj3apage.com/index/Tech_Tips/Model%2018%20Rebuild.htm

Note: Rick also has loaded U Tube with this guide data:
https://www.youtube.com/watch?v=3-2TgW2hE_w Pt-1
https://www.youtube.com/watch?v=O5-M7ep1ag8 Pt-2
https://www.youtube.com/watch?v=l8isUHHgdus Pt-3

https://www.novak-adapt.com/knowledge/transfer-cases/model-18
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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CapnDan
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Joined: Feb 24, 2009
Posts: 45
Location: Victoria,Texas

PostPosted: Sun Apr 21, 2024 4:21 pm    Post subject: Reply with quote

Yes I have been using Rick's rebuild guide instructions and you tube videos. I did not have the end play set correctly. I added shims to get the required end play of .004-.008. The front shaft does rotate easier relative to the rear shaft with correct end play, but it's still tight. Just read Novak's instructions and double checked shimming and the end play. I have about .005 end play. I had to add a lot more shim with the new Timken bearing cups and cones. It had .073 shim stack in it when I disassembled. I am now at about .125 shim.
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Danny L. Harris
aka Bubba
1954 M38A1
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4x4M38
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Joined: May 30, 2014
Posts: 3452
Location: Texas Hill Country

PostPosted: Sun Apr 21, 2024 5:01 pm    Post subject: Reply with quote

I was wondering if it was end play, but waited to see if you got there.
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Brian
1950 M38
MC11481
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