newby question about bolting on np205 and o-ring - The 1947 - Present Chevrolet & GMC Truck Message Board Network

superchevy · 03-28-2009, 10:04 AM

Hi guys,
Finally putting the drivetrain into my '72 K25...468/4l80e/np205...I just have a question about sealing the transfer case to the transmission/t-case adapter. I've had the T400 adapter machined to fit in the rear of the 4L80e...I have the o-ring and gasket for the transmission side of the adapter...my question is, is there supposed to be an o-ring on the transfer case side of the adapter...I have the "figure 8" gasket...just need to know if I need an o-ring on this side as well, and if so, can you get them at NAPA, A-zone, etc.?
Thanks,
Casey

msgross · 04-01-2009, 09:11 AM

don't know the answer to that one... maybe one of our tech experts can answer that one..

discodadee · 04-01-2009, 10:53 AM

Usually you can just "goop" it with RTV, or I know there are some places online that sell oem type replacements. Good luck with NAPA, A-zone, etc...usually they're clueless on transfer cases or anything of vintage what-so-ever, occasionally you'll get lucky, but it's rare.

03-28-2009, 10:04 AM	#1
superchevy Got big-block? Join Date: Jul 2000 Location: Austin, Texas Posts: 2,453	newby question about bolting on np205 and o-ring Hi guys, Finally putting the drivetrain into my '72 K25...468/4l80e/np205...I just have a question about sealing the transfer case to the transmission/t-case adapter. I've had the T400 adapter machined to fit in the rear of the 4L80e...I have the o-ring and gasket for the transmission side of the adapter...my question is, is there supposed to be an o-ring on the transfer case side of the adapter...I have the "figure 8" gasket...just need to know if I need an o-ring on this side as well, and if so, can you get them at NAPA, A-zone, etc.? Thanks, Casey __________________ '68 CST SWB factory 396/T400 buddy buckets, a/c, ps, pb '72 Corvette convertible 454/4spd/ac, ps, pb '73 GMC Sierra Grande short wide 454/T400 ps, pb, ac '77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original '78 GMC Sierra Classic short wide 454/T400 ps, pb, ac '72 GMC Sprint SP454. 1 of 38 built. '73 GMC Sprint SP454. 1 of 71 built. '75 GMC Sprint SP454. 1 of 25 built. SOLD! '72 GMC K25 4x4 468/4L80e/NP205 build thread http://67-72chevytrucks.com/vboard/s...23#post4324423 SOLD!'55 Chevy gasser 496/4spd build thread http://67-72chevytrucks.com/vboard/s...96#post4324396

04-01-2009, 09:11 AM	#2
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: newby question about bolting on np205 and o-ring don't know the answer to that one... maybe one of our tech experts can answer that one.. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

04-01-2009, 10:53 AM	#3
discodadee Registered User Join Date: Mar 2009 Location: Greenwood, CA Posts: 18	Re: newby question about bolting on np205 and o-ring Usually you can just "goop" it with RTV, or I know there are some places online that sell oem type replacements. Good luck with NAPA, A-zone, etc...usually they're clueless on transfer cases or anything of vintage what-so-ever, occasionally you'll get lucky, but it's rare. __________________ 1957 GMC (mostly) on 1980 4wd chassis 350/th350 np203 w/part time conversion



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