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: 78	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: 3,051	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: 78	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: 78	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: 3,051	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: 11,382	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),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 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: 78	Re: Looking for GMC SM420 part MJN thank you very much for the help, I bought the one on EBAY.



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