gaucho919 Posted July 14, 2011 Share Posted July 14, 2011 I've been working on my '87 dana 30 HP vaccum diso with 4.10's to match my 8.8. when doing the one piece shaft conversion(shafts from either a TJ/XJ/ZJ) we need to add a seal inside the pumpkin on the passenger side. all my forum searching lead to seal National p/n 471763 or Napa 11800. both seals have an outer diameter of 2.004" for a a housing bore of 2". I busted mine while trying to install it bc my Housing bore is smaller. I used the National seals book at O'reilly and found the right seal If you're doing this on a early Dana 30. My '87 dana 30's housing bore is 1.975" I found: National p/n 471747 Shaft Size=1.125" Housing Bore=1.983 Outer Diameter=1.987 Width=0.25in put it in the freezer for 1/2 hour and it works!!! Link to comment Share on other sites More sharing options...
mvusse Posted July 14, 2011 Share Posted July 14, 2011 I used Napa 11771 (National equivalent is 40576s) which has a bore size of 1.996" and fit perfectly in my 87 D30. A friend recently converted his (don't know offhand what year) and used that same one. Link to comment Share on other sites More sharing options...
86FUBAR Posted July 15, 2011 Share Posted July 15, 2011 When I swapped out the 2 piece shaft for a 1 piece I just cleaned the housing out really good and installed some Alloy Tube Seals and overfilled the diff by about a half quart and ran it like that for allmost 2 years . After that I got it regeard and the shop put in the approiate seal but I don't know the # . Link to comment Share on other sites More sharing options...
SW86 Posted July 15, 2011 Share Posted July 15, 2011 good stuff. I'm about to swap out my shafts for the one piece so this saved me the time from searching! :bowdown: Link to comment Share on other sites More sharing options...
gaucho919 Posted July 18, 2011 Author Share Posted July 18, 2011 I'm glad, I posted this so it could be passed on, good luck with your swap :D Link to comment Share on other sites More sharing options...
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