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#1 |
Registered User
Join Date: Jul 2015
Location: Smithton, Mo.
Posts: 158
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Rockwell T221 mounting adapter seals
Anyone have a part number for the two seals in the adapter that goes between the sm465 and Rockwell t221 transfer case. Local parts stores are having trouble getting me the right seals. The dimensions are 2.62" OD, 1.875" ID for both seals, but the one on the trans side is 1/2" wide and the other is like 5/16" wide.
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#2 |
Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: Rockwell T221 mounting adapter seals
It is sm420 and the Rockwell t221 tcase not a sm465
I do not recall the seal part numbers as it was in the early 90s i had mine apart last i do love the little bit extra low gear you get out of this pair over the 465 205 combo |
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#3 |
Registered User
Join Date: Jul 2015
Location: Smithton, Mo.
Posts: 158
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Re: Rockwell T221 mounting adapter seals
I stand corrected on the trans number. SM 420 trans.
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#4 |
Registered User
Join Date: Jul 2002
Location: St. James, MO
Posts: 1,239
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Re: Rockwell T221 mounting adapter seals
Hold the phone! The T-221 was most certainly mated with the SM465 in '69.
__________________
'69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt. |
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#5 |
Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: Rockwell T221 mounting adapter seals
I have had 4 69 trucks they all had a sm420 with t221 tcase only trucks i seen with sm465 and a np205 tcase are 70 and newer or trucks that had been converted
One easy tell tail is sm420 front driveshafts is it has only 2 u joints Where the sm465 setups have 3 u joints two make up a cardan joint https://www.rockauto.com/en/catalog/...haft+seal,8416 |
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#6 |
Registered User
Join Date: Jul 2015
Location: Smithton, Mo.
Posts: 158
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Re: Rockwell T221 mounting adapter seals
Mine has 3 u joints for the front shaft. Either way I'm looking for the seal numbers for the adapter mount. Pretty sure it's a sm465.
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#7 | |
Registered User
Join Date: Apr 2017
Location: Knoxville, Tennessee
Posts: 891
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Re: Rockwell T221 mounting adapter seals
Quote:
http://67-72chevytrucks.com/vboard/s...d.php?t=796874
__________________
1969 GMC K25 2007 Chevy 2500HD Classic Duramax 1999 Tahoe 2DR 4WD Base Model 5.7l |
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#8 | |
Registered User
Join Date: Apr 2017
Location: Knoxville, Tennessee
Posts: 891
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Re: Rockwell T221 mounting adapter seals
Quote:
__________________
1969 GMC K25 2007 Chevy 2500HD Classic Duramax 1999 Tahoe 2DR 4WD Base Model 5.7l |
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#9 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,250
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Re: Rockwell T221 mounting adapter seals
GM did produce trucks with an SM465/Rockwell T221 transmission/transfer case in Model Year 1968. They may have also gone into MY '69 on GMCs and Canadian trucks.
I know there is such an animal, I have one as a core.
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#10 |
Registered User
Join Date: Jul 2015
Location: Smithton, Mo.
Posts: 158
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Re: Rockwell T221 mounting adapter seals
Hotcorner that seal is for a 2" shaft size. My coupler is 1.875". Do you recall what OD your coupler is?
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#11 | |
Registered User
Join Date: Apr 2017
Location: Knoxville, Tennessee
Posts: 891
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Re: Rockwell T221 mounting adapter seals
Quote:
I’ll measure the coupler. I have an extra one in the garage.
__________________
1969 GMC K25 2007 Chevy 2500HD Classic Duramax 1999 Tahoe 2DR 4WD Base Model 5.7l |
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#12 |
Registered User
Join Date: Jul 2002
Location: St. James, MO
Posts: 1,239
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Re: Rockwell T221 mounting adapter seals
Don't have a pic of the SPID handy, but both the SM465 and the T221 are on it: '69 Chevy K-10.
__________________
'69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt. |
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#13 |
Registered User
Join Date: Jul 2015
Location: Smithton, Mo.
Posts: 158
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Re: Rockwell T221 mounting adapter seals
The seal part number for the transfer case mounting adapter are SKF brand 18581. It requires two seals. The number for the drive shaft seals on the transfer case are SKF 17387 or National 472164. Also requires two. Hope this helps someone in the future. All parts books or parts stores will tell you different. These are the numbers that cross reference to the seals that I removed. The measurements for the seals are 2.625" OD, 1.875" ID. The width really doesn't matter for this application.
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#14 |
Registered User
Join Date: Apr 2017
Location: Knoxville, Tennessee
Posts: 891
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Re: Rockwell T221 mounting adapter seals
The OD for my sleeve is 2”.
__________________
1969 GMC K25 2007 Chevy 2500HD Classic Duramax 1999 Tahoe 2DR 4WD Base Model 5.7l |
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#15 |
Registered User
Join Date: Jul 2015
Location: Smithton, Mo.
Posts: 158
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Re: Rockwell T221 mounting adapter seals
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