Newbie questions. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**HO455** · 02-25-2018, 07:28 PM

Thats a nice rig. From everything I have seen 67 was the last year for the sm420 so a sm465 should be the tranny it came with from the factory unless something else was ordered or changed. Are you sure it is a C20 it maybe a 30. Check the SPID to help verify. The manual lists a New Process NP435 as an optional close ratio tranny. Is it a leaf spring truck? Is the gray box on the hump the two way radio?

4carbcorvair · 02-25-2018, 07:39 PM

It's a K20, leaf front/rear.

I didn't get any pics of the underside while I was there. I should have. Will the next time I'm there. I know the sm465, have one in my Jeep CJ. I didn't take a look, my bad. I'll also check the SPID. It's a low mileage truck, just under 60,000 miles.

**HO455** · 02-25-2018, 07:46 PM

Nice low mileage score. Here is a link to Novak's information page it should help with identification of the tranny. The good part of the wrecker in the back is most people won't ask you to help move. The bad part is it is too easy to drag stuff home.

https://www.novak-adapt.com/knowledg...ssions/manual/

02-25-2018, 07:28 PM	#1
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,613	Re: Newbie questions. Thats a nice rig. From everything I have seen 67 was the last year for the sm420 so a sm465 should be the tranny it came with from the factory unless something else was ordered or changed. Are you sure it is a C20 it maybe a 30. Check the SPID to help verify. The manual lists a New Process NP435 as an optional close ratio tranny. Is it a leaf spring truck? Is the gray box on the hump the two way radio? __________________ 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

02-25-2018, 07:39 PM	#2
4carbcorvair Registered User Join Date: Feb 2018 Location: Gorham, ME Posts: 96	Re: Newbie questions. It's a K20, leaf front/rear. I didn't get any pics of the underside while I was there. I should have. Will the next time I'm there. I know the sm465, have one in my Jeep CJ. I didn't take a look, my bad. I'll also check the SPID. It's a low mileage truck, just under 60,000 miles. __________________ 68 K20 Custom Camper/CST Wrecker. 97 GMC K1500 short bed reg cab.

02-25-2018, 07:46 PM	#3
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,613	Re: Newbie questions. Nice low mileage score. Here is a link to Novak's information page it should help with identification of the tranny. The good part of the wrecker in the back is most people won't ask you to help move. The bad part is it is too easy to drag stuff home. https://www.novak-adapt.com/knowledg...ssions/manual/ __________________ 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

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