NP205 oil seals are hard to locate??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OlyHeeebz · 06-14-2005, 06:56 PM

One of the 2 rubber seals that goes inside the adapter between the TH350 tranny and NP205 in my truck has gone bad, and oil and trans fluid are sloshing back and forth.

To my surprise, the local GM dealer in my area can not seem to locate the seals. In fact, they can't even cross reference them to find out which ones to order. There are little numbers on the seals and everything, and the guys behind the counter still can't figure it out.

Anybody know where to buy these seals? Or what the new GM parts number is?

Thanks

**Phuloi68** · 06-14-2005, 09:22 PM

go to your local bearing supply place. they can supply them.

Paso76GMCstepper · 06-14-2005, 11:40 PM

My local Napa had em for mine.

Also try here

www.nationaldrivetrain.com

**kwmech** · 06-14-2005, 11:41 PM

I have the part numbers at work, hope I remember tomorrow.

drink2mny · 06-14-2005, 11:49 PM

We can ge them over here in Spokane...

4x4Poet · 06-15-2005, 05:15 AM

Yup, a bearing sales store will just pull or cross the p/ns on your seals.

**Richard** · 06-16-2005, 02:08 AM

Make sure to check and probably replace the o-ring on the t-case input shaft. I have had two 350/205 setups that leaked from that seal not the ones directly in the adapter.

teamroper! · 06-17-2005, 08:48 AM

tell your dealer to look in group 4.515. the part number 3979626 should be the seal that you require, but check your application with your dealer, Be sure and use a GM seal as I've not had good luck with aftermarket seals. The part number shows to fit just about everything GM makes that had a NP205.

HeavyK20 · 06-21-2005, 08:42 AM

Try here: http://www.drivetrain.com/transfercasesparts.html#New

stueber68 · 06-21-2005, 12:39 PM

Do I see that another GM parts spec. is a member here? That's what I do.

teamroper! · 06-21-2005, 12:56 PM

stueber68, how long have you been at it?

tgh117 · 06-27-2005, 12:22 PM

Quote:

Originally Posted by teamroper!

tell your dealer to look in group 4.515. the part number 3979626 should be the seal that you require, but check your application with your dealer, Be sure and use a GM seal as I've not had good luck with aftermarket seals. The part number shows to fit just about everything GM makes that had a NP205.

My dad hooked me up with this part number, and it turned out to be the transfer case shifter slide seals. The part number for the seal between my tcase and trans was 3968050. Its all back under the truck though, and now it doesnt leak

06-14-2005, 06:56 PM	#1
OlyHeeebz Registered User Join Date: Jan 2005 Location: Seattle, WA Posts: 41	NP205 oil seals are hard to locate??? One of the 2 rubber seals that goes inside the adapter between the TH350 tranny and NP205 in my truck has gone bad, and oil and trans fluid are sloshing back and forth. To my surprise, the local GM dealer in my area can not seem to locate the seals. In fact, they can't even cross reference them to find out which ones to order. There are little numbers on the seals and everything, and the guys behind the counter still can't figure it out. Anybody know where to buy these seals? Or what the new GM parts number is? Thanks __________________ 1969 K5 Blazer CST Always waiting for the Puget Sound sun.....

06-14-2005, 09:22 PM	#2
Phuloi68 Senior Member Join Date: Dec 2003 Location: Valparaiso, In Posts: 1,114	go to your local bearing supply place. they can supply them. __________________ Phuloi68 Indy survivor Norwood survivor Big Sandy survivor for those who fight for it... F R E E D O M has a price the protected will never know.

06-14-2005, 11:40 PM	#3
Paso76GMCstepper Registered User Join Date: Jan 2004 Location: Paso Robles, CA Posts: 347	My local Napa had em for mine. Also try here www.nationaldrivetrain.com __________________ Tony "Life is a Team Sport" To the memory of the Hendrick Motorsports Plane Crash Victims

06-14-2005, 11:49 PM	#5
drink2mny Registered User Join Date: Jun 2003 Location: spokane wa Posts: 2,189	We can ge them over here in Spokane... __________________ Support The Board

06-15-2005, 05:15 AM	#6
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Yup, a bearing sales store will just pull or cross the p/ns on your seals. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

06-14-2005, 11:41 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,628	I have the part numbers at work, hope I remember tomorrow.

06-16-2005, 02:08 AM	#7
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,881	Make sure to check and probably replace the o-ring on the t-case input shaft. I have had two 350/205 setups that leaked from that seal not the ones directly in the adapter. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

06-17-2005, 08:48 AM	#8
teamroper! Registered User Join Date: Nov 2003 Location: northeast alabama Posts: 258	tell your dealer to look in group 4.515. the part number 3979626 should be the seal that you require, but check your application with your dealer, Be sure and use a GM seal as I've not had good luck with aftermarket seals. The part number shows to fit just about everything GM makes that had a NP205. Last edited by teamroper!; 06-17-2005 at 08:48 AM.

06-21-2005, 08:42 AM	#9
HeavyK20 Registered User Join Date: Dec 2001 Location: New Richmond, WI Posts: 547	Try here: http://www.drivetrain.com/transfercasesparts.html#New __________________ Eric 1969 K20, 465/205 package Last edited by HeavyK20; 06-21-2005 at 08:43 AM.

06-21-2005, 12:39 PM	#10
stueber68 1968 C20 Vortec Beast Join Date: Jun 2005 Location: STILLWATER,OKLAHOMA Posts: 483	Do I see that another GM parts spec. is a member here? That's what I do.

06-21-2005, 12:56 PM	#11
teamroper! Registered User Join Date: Nov 2003 Location: northeast alabama Posts: 258	stueber68, how long have you been at it?

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