420/465 swap? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

7084Driver · 01-08-2005, 05:28 PM

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Hello to all.My first post here. Im the owner of a 70' 3/4 ton chevy truck. want to swap out sm 420/t-221 combo with sm465/205. does any one know if there will be any issues. I noticed the 465 is longer and a little bigger. Also i have aluminum and cast bellhousings, which would u guys recommend.

Thanks, Ryan Martinsburg WV

784X4GUY · 01-08-2005, 08:51 PM

The SM465 and NP205 is a killer combo, good luck with it...Later Mike

7084Driver · 01-08-2005, 09:04 PM

Yea, i hope it all fits up right. Im gonna go ahead and do it and hope for the best

784X4GUY · 01-08-2005, 09:26 PM

Yeah, let me know how everything fits...Later Mike

69ssnova · 01-08-2005, 10:23 PM

witch one is the top loader 4-speed 420 or 465 thanks greg

**kwmech** · 01-08-2005, 10:28 PM

They both have top covers. I think? the 465 has a larger diameter nose cone, so you may have to go with the aluminum bellhousing

Americanrider · 01-09-2005, 03:25 AM

Check this thread, was thinking about doing the same swap in my '67.

http://67-72chevytrucks.com/vboard/s....php3?t=127782

1969 GMC · 01-09-2005, 04:34 AM

your '70 should not have a 420, '67 was the last year for it. sounds like a p/o swapped out the 465/205 combo you want and put that in. at any rate, it wont be an involved project...i was in the process of swapping my 221 out for a 205, and all I had to do was move the crossmember back a few inches. that was when a lot of other stuff went wrong with my truck, so I parked it. havent had the driveshafts redone yet.

7084Driver · 01-10-2005, 11:31 AM

Not sure about the 420 being in there. This truck was set up to pull, but the frame was not all butchered up so im gonna put it back on the street. I took apart the 465 last nite. The gears and bearings are a little rusty but they arent torn up that i can see. The truck should be pretty tough when i get it done. Like i said its a 70/ 3/4 ton, dana 60 rear and dana 44 front with drum brakes that i hope to do away with. But thanks for all the help.

Ryan, Martinsburg, WV

**JIMs70GMC** · 01-10-2005, 11:36 AM

Those 3/4 ton 1970 drums are a pain to find! Does the tranny you have in the truck have 2 pto covers, reverse is right and down?

7084Driver · 01-10-2005, 11:46 AM

Yes sir, 2 pto covers and im pretty sure its right and down, my dad has the same tranney in his 1984 and thats how his is. The 420 was left and down.

01-08-2005, 05:28 PM	#1
7084Driver Registered User Join Date: Jan 2005 Posts: 21	420/465 swap? -------------------------------------------------------------------------------- Hello to all.My first post here. Im the owner of a 70' 3/4 ton chevy truck. want to swap out sm 420/t-221 combo with sm465/205. does any one know if there will be any issues. I noticed the 465 is longer and a little bigger. Also i have aluminum and cast bellhousings, which would u guys recommend. Thanks, Ryan Martinsburg WV

01-08-2005, 08:51 PM	#2
784X4GUY Did someone say MUD? Join Date: Aug 2003 Location: Pullman,WA Posts: 1,089	The SM465 and NP205 is a killer combo, good luck with it...Later Mike __________________ Im in the market guys...so keep ya eyes peeled -------------------- Mini trucks are for guys who cant get it up!

01-08-2005, 09:26 PM	#4
784X4GUY Did someone say MUD? Join Date: Aug 2003 Location: Pullman,WA Posts: 1,089	Yeah, let me know how everything fits...Later Mike __________________ Im in the market guys...so keep ya eyes peeled -------------------- Mini trucks are for guys who cant get it up!

01-09-2005, 04:34 AM	#8
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	your '70 should not have a 420, '67 was the last year for it. sounds like a p/o swapped out the 465/205 combo you want and put that in. at any rate, it wont be an involved project...i was in the process of swapping my 221 out for a 205, and all I had to do was move the crossmember back a few inches. that was when a lot of other stuff went wrong with my truck, so I parked it. havent had the driveshafts redone yet. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

01-10-2005, 11:36 AM	#10
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Those 3/4 ton 1970 drums are a pain to find! Does the tranny you have in the truck have 2 pto covers, reverse is right and down? __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

01-08-2005, 09:04 PM	#3
7084Driver Registered User Join Date: Jan 2005 Posts: 21	Yea, i hope it all fits up right. Im gonna go ahead and do it and hope for the best

01-08-2005, 10:23 PM	#5
69ssnova Registered User Join Date: Dec 2002 Location: rock hill sc Posts: 69	witch one is the top loader 4-speed 420 or 465 thanks greg

01-08-2005, 10:28 PM	#6
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,650	They both have top covers. I think? the 465 has a larger diameter nose cone, so you may have to go with the aluminum bellhousing

01-09-2005, 03:25 AM	#7
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Check this thread, was thinking about doing the same swap in my '67. http://67-72chevytrucks.com/vboard/s....php3?t=127782

01-10-2005, 11:31 AM	#9
7084Driver Registered User Join Date: Jan 2005 Posts: 21	Not sure about the 420 being in there. This truck was set up to pull, but the frame was not all butchered up so im gonna put it back on the street. I took apart the 465 last nite. The gears and bearings are a little rusty but they arent torn up that i can see. The truck should be pretty tough when i get it done. Like i said its a 70/ 3/4 ton, dana 60 rear and dana 44 front with drum brakes that i hope to do away with. But thanks for all the help. Ryan, Martinsburg, WV

01-10-2005, 11:46 AM	#11
7084Driver Registered User Join Date: Jan 2005 Posts: 21	Yes sir, 2 pto covers and im pretty sure its right and down, my dad has the same tranney in his 1984 and thats how his is. The 420 was left and down.



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