Looking for GMC SM420 part - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**67km1590** · 09-14-2023, 05:42 PM

Looking for front bearing/input shaft retainer/cover part #2454786.
This was only used with the GMC V6 engines and maybe only 4X4's.

**HO455** · 09-15-2023, 04:05 PM

Have you contacted Novac Adapters? They may know all the applications and if there is a cross. They've always been great help to me with SM420's. I have some 420s but no GMCs that I am aware of.

**MJN** · 09-15-2023, 04:19 PM

In case you can't find just the front retainer I have the whole transmission available. https://67-72chevytrucks.com/vboard/...d.php?t=839760

**67km1590** · 09-15-2023, 05:56 PM

Thanks for the interest. Yes I did contact Novac thinking they may be able to take their regular billet retainer and lenghten it 1 1/8", They were very nice but said their shop was so far behind on production parts they couldn't work it in. I have have a great local machine shop that I use and they're going to make one for me. Thanks MJN but the regular one you have won't work with a GMC V6.

**MJN** · 09-15-2023, 05:58 PM

Quote:

Originally Posted by 67km1590

Thanks for the interest. Yes I did contact Novac thinking they may be able to take their regular billet retainer and lenghten it 1 1/8", They were very nice but said their shop was so far behind on production parts they couldn't work it in. I have have a great local machine shop that I use and they're going to make one for me. Thanks MJN but the regular one you have won't work with a GMC V6.

No problem, thought it would work. It was from a '67 GMC V6 truck, so it would work for a V6.

**67km1590** · 09-16-2023, 09:54 AM

MJN could you get the part number cast on the front bearing retainer? I don't have the numbers in front of me but the KM trucks start with a 2 and all others with a 3. Mine has the correct number but has saw marks where it was cut down when the truck was swapped to a SBC. Yours appears to look like the more common Chev version. You wouldn't happen to have the V6 engine stands from that truck would you?

**MJN** · 09-16-2023, 11:25 AM

Mine starts with 37xxxxx, the rest is hard to read, it did come from a 67 GMC K2500 with divorced T221. The truck is long gone and I don't have any other parts from it except the trans, bellhousing and clutch fork.
Yours looks like it came out of medium duty truck according to the parts book on gmpartswiki;
http://www.gmpartswiki.com/getpage?pageid=222347

heres one of yours on ebay;
https://www.ebay.com/itm/133420697568

**67km1590** · 09-18-2023, 09:17 AM

MJN thank you very much for the help, I bought the one on EBAY.

09-14-2023, 05:42 PM	#1
67km1590 Junior Member Join Date: Feb 2022 Location: Ohio Posts: 72	Looking for GMC SM420 part Looking for front bearing/input shaft retainer/cover part #2454786. This was only used with the GMC V6 engines and maybe only 4X4's.

09-15-2023, 04:19 PM	#3
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 2,963	Re: Looking for GMC SM420 part In case you can't find just the front retainer I have the whole transmission available. https://67-72chevytrucks.com/vboard/...d.php?t=839760 __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

09-15-2023, 05:56 PM	#4
67km1590 Junior Member Join Date: Feb 2022 Location: Ohio Posts: 72	Re: Looking for GMC SM420 part Thanks for the interest. Yes I did contact Novac thinking they may be able to take their regular billet retainer and lenghten it 1 1/8", They were very nice but said their shop was so far behind on production parts they couldn't work it in. I have have a great local machine shop that I use and they're going to make one for me. Thanks MJN but the regular one you have won't work with a GMC V6.

09-16-2023, 09:54 AM	#6
67km1590 Junior Member Join Date: Feb 2022 Location: Ohio Posts: 72	Re: Looking for GMC SM420 part MJN could you get the part number cast on the front bearing retainer? I don't have the numbers in front of me but the KM trucks start with a 2 and all others with a 3. Mine has the correct number but has saw marks where it was cut down when the truck was swapped to a SBC. Yours appears to look like the more common Chev version. You wouldn't happen to have the V6 engine stands from that truck would you?

09-16-2023, 11:25 AM	#7
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 2,963	Re: Looking for GMC SM420 part Mine starts with 37xxxxx, the rest is hard to read, it did come from a 67 GMC K2500 with divorced T221. The truck is long gone and I don't have any other parts from it except the trans, bellhousing and clutch fork. Yours looks like it came out of medium duty truck according to the parts book on gmpartswiki; http://www.gmpartswiki.com/getpage?pageid=222347 heres one of yours on ebay; https://www.ebay.com/itm/133420697568 __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

09-15-2023, 04:05 PM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,807	Re: Looking for GMC SM420 part Have you contacted Novac Adapters? They may know all the applications and if there is a cross. They've always been great help to me with SM420's. I have some 420s but no GMCs that I am aware of. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

09-18-2023, 09:17 AM	#8
67km1590 Junior Member Join Date: Feb 2022 Location: Ohio Posts: 72	Re: Looking for GMC SM420 part MJN thank you very much for the help, I bought the one on EBAY.



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