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#1 |
Senior Member
![]() Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,049
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NP 205 transfer case leak
Thought I'd post this to help anyone with a np205 transfer case leak at the speedo drive. Reading different post the factory used a oring on the pinion shaft but is pretty prone to wearing out and leaking so GM started selling new adapter nuts with a larger I.D from .506 to .579 to have a press in seal to help hold back the oil, but now are discontinued by GM # 326561. Other places are making the same adapter nut with the new style seal but the I.D of the seal was larger than my .250 shaft size. Ended up going to napa auto parts and looking through there seal book and found a seal that would fit my .250 shaft and also the .506 O.D part number 2450 SKF brand. The seal fits perfectly on the shaft I.D but just barely catches the inside of the nut where it presses into( nut Is .506 and the O.D of seal is .505) but with some bearing epoxy or a punch with some light Mark's made inside the nut it will hold fine. Just thought I'd make this post to help anyone with the same issue. P.S the new style nut is around 50.00 vs this seal I bought was 5.99.
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#2 |
Senior Member
![]() Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,049
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Re: NP 205 transfer case leak
Here's me with a punch and making some light dimples to hold the seal once I press it in. I will also use a lite film of RTV silicone around the outside of seal to make sure it seals .
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#3 |
Registered User
Join Date: Apr 2012
Location: Chatt Tn
Posts: 970
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Re: NP 205 transfer case leak
thats good info. thanks.
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88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535 |
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#4 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,401
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Re: NP 205 transfer case leak
Thanks for the info! I’m sure I’ll be crossing this bridge in the next few months as my K20 nears being road ready. Thanks for taking the time to not only figure this out but for sharing it as well.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s |
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#5 |
Senior Member
![]() Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,049
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Re: NP 205 transfer case leak
I will say when I put everything together I installed the gear shat into the nut/seal first then put it in the speedo housing. Putting the gear in first then trying to screw the nut in and aligning the shaft with the seal was a little hard and I was afraid of damaging the seal so that's why I put the gear into the seal first and used a small pick to help walk the seal around the shaft. Once it was together I used a small screw driver inside the square hole where the speedo cable goes in to help steady it while I screwed it in and tried to catch the other bushing inside the housing that the other end of the gear goes into. Hope this makes sense and you might be fine installing the gear first then screwing the nut on. This is just what seemed to work better for me.
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#6 |
Registered User
Join Date: Dec 2009
Location: El Dorado Ca
Posts: 3,374
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Re: NP 205 transfer case leak
thanks for the info
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#7 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,563
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Re: NP 205 transfer case leak
Thank You for this info. Do you have an update as to whether this solved the leak long term?
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#8 |
Senior Member
![]() Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,049
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Re: NP 205 transfer case leak
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#9 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,563
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Re: NP 205 transfer case leak
I was thinking I could possible "flare" out the lip of the seal so it would fit better. It's cheap enough so I will try it.
__________________
70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#10 |
Senior Member
![]() Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,049
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Re: NP 205 transfer case leak
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