What kind of transmission do I have - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tx Firefighter · 12-22-2004, 10:15 PM

I don't speak fluent manual transmission in old GM vehicles. My 72 1 ton dually has a big, clunky, 4 speed in it.

What transmission would it be?

dwaite72lnghrn · 12-22-2004, 10:22 PM

I'd think it would be the 465 reverse down and to the right, Granny low up to the left!

70c10 · 12-22-2004, 10:56 PM

I stole this pic off ebay. This is a SM465. Does it look like this?, because these are pretty common from 1968 to mid 80's trucks.

3 on the tree · 12-22-2004, 11:09 PM

Could be a NP 435 also. I will have a round or square tag with NP 435 stamped on it.

70c10 · 12-22-2004, 11:52 PM

3 on the tree could be right also. This link shows the pan differences, dimensions, top cover (aluminum or iron), PTO port locations,etc. This should make it easy for you:http://www.eastcoastk5.com/Tranny%20Tech.htm#465

Robert1970C20rstbukt · 12-23-2004, 01:08 AM

I pulled a 4 speed out of a '72 GMC 1 ton and found out it's a 4 speed muncie. I'll get a pic out of a service manual later.

687980chevy · 12-23-2004, 01:55 AM

Muncie made the sm465 for GM. 70c10's picture is also the 4wd version you can see the flange & bottom mount for the T-case. All 3 of my trucks are sm465's some are sloppier shifting than others.

1969 GMC · 12-23-2004, 04:34 AM

if it has an aluminum top cover, its the NP435. However it came in close and wide ratio versions, which would be indicated on the SPID label. if it has a cast iron top cover and is original, its the 465. it should have two pto ports and reverse to the pass. side and down.

68w/sbc406 · 12-23-2004, 04:45 AM

in my 68 the build sheet said M20 which i assume is the same as a sm420, pics not quite as clean as the one above

arkracing · 12-23-2004, 09:43 AM

are they worth anything? or just good for weight in scrap? i had one in my truck with the cast iron top and PTO ports on both sides (for 4x4)??? it looks like the one in the last pics posted...greasy + red. mine is just greasy

i don't plan on using it

**JIMs70GMC** · 12-23-2004, 10:04 AM

The SM 465 has pto ports on both sides. The NP435 has a pto port on the pass side and the SM420 has a pto port on the driver side.

stickshift_or_walk · 12-23-2004, 12:44 PM

Tx,

Novak's site for 4x4's has a good picture of various manual transmissions for comparison purposes. Each picture links to a more detailed description of each tranny.

Quote:

Originally Posted by 687980chevy

All 3 of my trucks are sm465's some are sloppier shifting than others.

This is often caused by a break in the hardened tip of the shift lever. This is the part just below the collar that holds the lever in the tranny cover. The lever is joined to a hardened steel cap that will break, but doesn't come apart, so it just gets sloppy. If you can wiggle the hardened tip, it's broken. GM still has the new ones. They even come in chrome, but they're pricey.

It makes a big difference in the slop.

SSOW

Cethern · 12-23-2004, 01:31 PM

My vote would be a sm420 Reverse on that would be to the lower left.. The case has a hump on the passenger side.

1969 GMC · 12-23-2004, 02:57 PM

Quote:

Originally Posted by 68w/sbc406

in my 68 the build sheet said M20 which i assume is the same as a sm420, pics not quite as clean as the one above

nope that is a 465, M20 is GM's generic code for a 4 speed truck transmission iirc. so they used the same code for the 420 or the 465. yours has 2 pto ports so its the 465.

68w/sbc406 · 12-23-2004, 03:35 PM

Quote:

Originally Posted by 1969 GMC

nope that is a 465, M20 is GM's generic code for a 4 speed truck transmission iirc. so they used the same code for the 420 or the 465. yours has 2 pto ports so its the 465.

well i guess thats what happens when you assume, thanks for letting me know what i had. it went to the dump a while ago

Cethern · 12-23-2004, 05:46 PM

Yes thats for the PTO

**JIMs70GMC** · 12-23-2004, 07:20 PM

And here is a PTO:

12-22-2004, 10:15 PM	#1
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	What kind of transmission do I have I don't speak fluent manual transmission in old GM vehicles. My 72 1 ton dually has a big, clunky, 4 speed in it. What transmission would it be? __________________ I'm on the Instagram- @Gearhead_Kevin

12-22-2004, 10:22 PM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	I'd think it would be the 465 reverse down and to the right, Granny low up to the left! __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

12-22-2004, 10:56 PM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	I stole this pic off ebay. This is a SM465. Does it look like this?, because these are pretty common from 1968 to mid 80's trucks. Attached Images __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads Last edited by 70c10; 12-22-2004 at 10:58 PM.

12-22-2004, 11:52 PM	#5
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	3 on the tree could be right also. This link shows the pan differences, dimensions, top cover (aluminum or iron), PTO port locations,etc. This should make it easy for you:http://www.eastcoastk5.com/Tranny%20Tech.htm#465 __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

12-23-2004, 01:08 AM	#6
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	I pulled a 4 speed out of a '72 GMC 1 ton and found out it's a 4 speed muncie. I'll get a pic out of a service manual later. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

12-22-2004, 11:09 PM	#4
3 on the tree Registered User Join Date: Oct 2004 Posts: 393	Could be a NP 435 also. I will have a round or square tag with NP 435 stamped on it.

12-23-2004, 01:55 AM	#7
687980chevy Registered User Join Date: Feb 2004 Location: Hilly Southern Indiana! Posts: 201	Muncie made the sm465 for GM. 70c10's picture is also the 4wd version you can see the flange & bottom mount for the T-case. All 3 of my trucks are sm465's some are sloppier shifting than others. __________________ 68 K-10,79 K-10,80 C-30 57 chevy convertible 79 Z28 Last edited by 687980chevy; 12-23-2004 at 01:57 AM.

12-23-2004, 04:34 AM	#8
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	if it has an aluminum top cover, its the NP435. However it came in close and wide ratio versions, which would be indicated on the SPID label. if it has a cast iron top cover and is original, its the 465. it should have two pto ports and reverse to the pass. side and down. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

12-23-2004, 04:45 AM	#9
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	in my 68 the build sheet said M20 which i assume is the same as a sm420, pics not quite as clean as the one above Attached Images __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

12-23-2004, 09:43 AM	#10
arkracing Weekend Warrior Join Date: Oct 2004 Location: CT Posts: 1,787	are they worth anything? or just good for weight in scrap? i had one in my truck with the cast iron top and PTO ports on both sides (for 4x4)??? it looks like the one in the last pics posted...greasy + red. mine is just greasy i don't plan on using it __________________ -'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered

12-23-2004, 10:04 AM	#11
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	The SM 465 has pto ports on both sides. The NP435 has a pto port on the pass side and the SM420 has a pto port on the driver side. __________________ 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

12-23-2004, 01:31 PM	#13
Cethern What was I thinking?? Join Date: Dec 2003 Location: Commerce City Co Posts: 637	My vote would be a sm420 Reverse on that would be to the lower left.. The case has a hump on the passenger side. __________________ 72 K5 that needs lots of parts.. 71 GMC 3/4 4x4 That doesn't need much which is a good thing I don't think I could aford another money pit...

12-23-2004, 05:46 PM	#16
Cethern What was I thinking?? Join Date: Dec 2003 Location: Commerce City Co Posts: 637	Yes thats for the PTO __________________ 72 K5 that needs lots of parts.. 71 GMC 3/4 4x4 That doesn't need much which is a good thing I don't think I could aford another money pit...

12-23-2004, 07:20 PM	#17
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	And here is a PTO: __________________ 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



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