Swap in a 465/205 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JIMs70GMC** · 05-07-2014, 03:09 PM

I am going to swap a SM465/NP205 combo from a 71 for my 700R4/NP208 in my 1986 K5. A previous owner installed the current motor a 350 for the stock 305. I have not run the numbers, but I think the 350 is an earlier 2-piece rear seal 350. So, help me run down my list of parts:

I have the 71 flywheel/clutch/pressure plate and the clutch fork

I need the clutch pedal assembly and will need to modify the tranny hump. In 1986 what type of clutch setup did it have? mechanical linkage or hydraulic?

Will the 71 bell housing work with the newer clutch linkage? or will I need to source a new one?

I could probably scour many sources for info but then I wouldn't get to talk with you all.

Thanks!

**JIMs70GMC** · 05-07-2014, 05:40 PM

Looks like it will be a hydraulic set-up.

**argonaut** · 05-08-2014, 01:55 AM

In 71 they used a mechanical clutch setup with a bell crank or z bar. In 86 they used a hydraulic clutch. Hydraulic is better (in my opinion) than mechanical. However you'll either need a different bellhousing or you'll need to buy a slave cylinder bracket made by advance adapters or fabricate your own bracket. You'll also want to find the factory clutch pedal assembly for an 85-87 pickup and bolt it in.
Why are you making the swap?

**JIMs70GMC** · 05-09-2014, 09:11 PM

I prefer the 4 speed over the 700R4/208. I'm going to look at advanced adapters. Thanks.

Redcap · 05-10-2014, 01:21 PM

Quote:

Originally Posted by JIMs70GMC

I prefer the 4 speed over the 700R4/208. I'm going to look at advanced adapters. Thanks.

The SM465/NP205 combo is a hell of a lot stronger than the weak-sister 700R4/NP208.

66skylarkpost · 05-10-2014, 10:30 PM

I put a 1975 465/205 in my 87 2 to 4 wheel drive build with early 80's mechanical clutch setup http://www.67-72chevytrucks.com/vboa...d.php?t=576936

**JIMs70GMC** · 05-11-2014, 09:53 PM

Quote:

Originally Posted by 66skylarkpost

I put a 1975 465/205 in my 87 2 to 4 wheel drive build with early 80's mechanical clutch setup http://www.67-72chevytrucks.com/vboa...d.php?t=576936

Very nice build! I am going to get the tranny/TC tomorrow. the guy has a bunch of stuff to go with it, so maybe I can get all the clutch linkage too.

burnin oil · 05-16-2014, 12:57 PM

You dont need to change the floor to a bolt out or anything. I put a 79 2wd auto cab on a 4x4 chasis with the 465 trans. All I did was cut the hole for the shifter. Having the bolt out floor pan does make pulling/installing the trans alot easier though. I prefer the mechanical clutch personally as you have alot more feel of clutch engaugement. The only factory hyd clutch I liked was from a 60 chevy pickup. It was adjustable so pedal hieght could be adjusted to your liking.

66skylarkpost · 05-16-2014, 01:48 PM

Quote:

Originally Posted by burnin oil

You dont need to change the floor to a bolt out or anything. I put a 79 2wd auto cab on a 4x4 chasis with the 465 trans. All I did was cut the hole for the shifter. Having the bolt out floor pan does make pulling/installing the trans alot easier though. I prefer the mechanical clutch personally as you have alot more feel of clutch engaugement. The only factory hyd clutch I liked was from a 60 chevy pickup. It was adjustable so pedal hieght could be adjusted to your liking.

well floors changed in 81 and Low hump floora were a little flatter after. If anything it makes it easier to drop trans and case. Only a handful of 81 to 87 s bolt in , so if u find a hump, buy it

05-07-2014, 03:09 PM	#1
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Swap in a 465/205 I am going to swap a SM465/NP205 combo from a 71 for my 700R4/NP208 in my 1986 K5. A previous owner installed the current motor a 350 for the stock 305. I have not run the numbers, but I think the 350 is an earlier 2-piece rear seal 350. So, help me run down my list of parts: I have the 71 flywheel/clutch/pressure plate and the clutch fork I need the clutch pedal assembly and will need to modify the tranny hump. In 1986 what type of clutch setup did it have? mechanical linkage or hydraulic? Will the 71 bell housing work with the newer clutch linkage? or will I need to source a new one? I could probably scour many sources for info but then I wouldn't get to talk with you all. Thanks! __________________ 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

05-07-2014, 05:40 PM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: Swap in a 465/205 Looks like it will be a hydraulic set-up. __________________ 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

05-08-2014, 01:55 AM	#3
argonaut Senior Member Join Date: Aug 2008 Location: Long Beach, CA Posts: 1,813	Re: Swap in a 465/205 In 71 they used a mechanical clutch setup with a bell crank or z bar. In 86 they used a hydraulic clutch. Hydraulic is better (in my opinion) than mechanical. However you'll either need a different bellhousing or you'll need to buy a slave cylinder bracket made by advance adapters or fabricate your own bracket. You'll also want to find the factory clutch pedal assembly for an 85-87 pickup and bolt it in. Why are you making the swap? __________________ Jason M. @argonaut62 1972 K5 Blazer CST, Turquoise 1966 K20 Short Fleet Pickup, Big Ugly 1964 C10 Short Fleet, Gertrude 2001 Porsche 911 Carrera 1996 Ford Bronco XLT 1980 Jeep Wagoneer 2008 Honda CBR1000RR 2005 Honda RC51 1981 Honda CB750C No dis-assemble Johnny Five! No dis-assemble!

05-09-2014, 09:11 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: Swap in a 465/205 I prefer the 4 speed over the 700R4/208. I'm going to look at advanced adapters. Thanks. __________________ 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

05-10-2014, 10:30 PM	#6
66skylarkpost Registered User Join Date: Mar 2006 Location: kearney,nebraska Posts: 443	Re: Swap in a 465/205 I put a 1975 465/205 in my 87 2 to 4 wheel drive build with early 80's mechanical clutch setup http://www.67-72chevytrucks.com/vboa...d.php?t=576936 __________________ '70 k-10 longbox- mid 70's drivetrain 350/350 487x heads 10.1:1 flowmasters ,35's 3.73's auburn posi ,rear shackle flip. '72 short stepside U.S. forestry truck, '73 455 buick,400 turbo,dropped 2"-4 1/4" ,3.07 posi,:'89 silverado 1500 ,OK truck ,5.7 holley tbi ,trick 700r4 3.07 auburn posi ,and my '66 skylark ,'73 centurion and my '84 monte carlo imca stock car

05-16-2014, 12:57 PM	#8
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,921	Re: Swap in a 465/205 You dont need to change the floor to a bolt out or anything. I put a 79 2wd auto cab on a 4x4 chasis with the 465 trans. All I did was cut the hole for the shifter. Having the bolt out floor pan does make pulling/installing the trans alot easier though. I prefer the mechanical clutch personally as you have alot more feel of clutch engaugement. The only factory hyd clutch I liked was from a 60 chevy pickup. It was adjustable so pedal hieght could be adjusted to your liking.

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