SM 465 Questions and Application info - The 1947 - Present Chevrolet & GMC Truck Message Board Network

longorange68 · 03-04-2008, 07:10 AM

Hey guys,

Looking for some input here. I have an original 1968 SM 465 that was put in my truck by my uncle when he owned it 15 years ago. This tranny replaced the stock three on the tree setup from the factory. My uncle dropped the SM 465 out of a 1968 junkyard C-10, grabbed all of the parts he needed to make it work from that truck, installed it in his and drove away. He also told me he never changed the fluid, just topped it off and never looked back. I think the last time I changed the fluid in it was about 1997. She is making a little noise to say the least, but still shifts fine and gets me around when I need her.

Here are my questions:
-How much torque can one of these handle? Would going with a larger diameter clutch help?

-In the interim, what do you recommend I do to prolong it's life before I rebuild her?

-When I start looking to get her rebuilt, how much is too much?

-Is there any modifications you would make to this tranny to make it function better?

(Currently the truck is a 250 L6 with 4:10 gears, going with a brand new Eaton Posi, and 3.08's, possibly a 450HP-550TQ Chevy 406 in her future)

Ace in the hole · 03-04-2008, 07:18 AM

here's a great article on the 465 - http://www.4wheeloffroad.com/brandpa...ild/index.html
and another- http://www.novak-adapt.com/knowledge/sm465.htm

Eichorst69 · 03-04-2008, 07:57 AM

The SM465 will handle a bunch of torque.
I would just drive it until you are ready to rebuild it, maybe change the fluid until then.
I replaced all the bearings and bushings in mine because the rubber dampner wore out and it began to make "clicking" noises.
You can do it yourself, they're simple.

Rob

retselgerg · 03-04-2008, 08:05 AM

I have one in my truck, the i changed the fluid in it, when i put my crate motor in, they are less fun then a reg 4 speed (or 5 speed which im installing soon) but they're as tough as a 3 dollar steak....

chev74 · 03-04-2008, 09:38 AM

yeah man, you pretty much CANT break it. i have a 1/2 ton stepside that i pulled an 8500lb trailer load with and it was a dream. that low gear can "pull the world" as my grandpa would say.

i have heard any regular joe can buy the $250 rebuild kit and do it in a weekend. I hope its true cuz i need it soon.

malibu795 · 03-04-2008, 10:43 AM

these guys are good as well

http://www.anaheimgear.com/

03-04-2008, 07:10 AM	#1
longorange68 Registered User Join Date: Apr 2006 Location: Hockinson, Washington Posts: 115	SM 465 Questions and Application info Hey guys, Looking for some input here. I have an original 1968 SM 465 that was put in my truck by my uncle when he owned it 15 years ago. This tranny replaced the stock three on the tree setup from the factory. My uncle dropped the SM 465 out of a 1968 junkyard C-10, grabbed all of the parts he needed to make it work from that truck, installed it in his and drove away. He also told me he never changed the fluid, just topped it off and never looked back. I think the last time I changed the fluid in it was about 1997. She is making a little noise to say the least, but still shifts fine and gets me around when I need her. Here are my questions: -How much torque can one of these handle? Would going with a larger diameter clutch help? -In the interim, what do you recommend I do to prolong it's life before I rebuild her? -When I start looking to get her rebuilt, how much is too much? -Is there any modifications you would make to this tranny to make it function better? (Currently the truck is a 250 L6 with 4:10 gears, going with a brand new Eaton Posi, and 3.08's, possibly a 450HP-550TQ Chevy 406 in her future) __________________ 1968 Chevrolet C-10, 2WD, Longbox, Vortec 350, 700R4, 3.73 gears Good judgment comes from experience, and experience, well......that comes from bad judgment. 1968 Chevy C-10 "Longshot": Bought used from my Uncle George in 1994 and proceeding to beat the hell out of it for 4 years. Sold it. Bought it back, dumped an ungodly amount of money into it since then.

03-04-2008, 07:18 AM	#2
Ace in the hole Registered User Join Date: Apr 2007 Location: Kalamazoo, Michigan, USA Posts: 538	Re: SM 465 Questions and Application info here's a great article on the 465 - http://www.4wheeloffroad.com/brandpa...ild/index.html and another- http://www.novak-adapt.com/knowledge/sm465.htm __________________ 1970 K20, 350--- SOLD 05 silverado extended cab short box- duramax Jeep wrangler unlimited Last edited by Ace in the hole; 03-04-2008 at 07:21 AM.

03-04-2008, 07:57 AM	#3
Eichorst69 Registered User Join Date: Jan 2007 Location: South Florida Posts: 158	Re: SM 465 Questions and Application info The SM465 will handle a bunch of torque. I would just drive it until you are ready to rebuild it, maybe change the fluid until then. I replaced all the bearings and bushings in mine because the rubber dampner wore out and it began to make "clicking" noises. You can do it yourself, they're simple. Rob

03-04-2008, 08:05 AM	#4
retselgerg Registered User Join Date: Mar 2007 Location: Grundy Virginia Posts: 385	Re: SM 465 Questions and Application info I have one in my truck, the i changed the fluid in it, when i put my crate motor in, they are less fun then a reg 4 speed (or 5 speed which im installing soon) but they're as tough as a 3 dollar steak.... __________________ "OLE BLUE" Goodwrench 350, 5speed, Tilt, PS, PB, "some guys got into cars for money or girls but i got into cars because of the cars" -Jay Leno

03-04-2008, 09:38 AM	#5
chev74 Addicted to Chevy Join Date: Dec 2004 Location: Tyler, Tx Posts: 857	Re: SM 465 Questions and Application info yeah man, you pretty much CANT break it. i have a 1/2 ton stepside that i pulled an 8500lb trailer load with and it was a dream. that low gear can "pull the world" as my grandpa would say. i have heard any regular joe can buy the $250 rebuild kit and do it in a weekend. I hope its true cuz i need it soon.

03-04-2008, 10:43 AM	#6
malibu795 Registered User Join Date: Feb 2008 Location: oxnard, ca Posts: 189	Re: SM 465 Questions and Application info these guys are good as well http://www.anaheimgear.com/ __________________ -A DAM WILD MAN- 59 apache pannel truck 38 I-6/sm420 79 malibu wagon 305/t56 02 2500hd duramax/allision 1/4 13.82 @100 mph efi live and built tranny 500hp 383 on the engine stand U.S. Navy 2000-Current Peace through Superior Firepower Horsepower = Condom.....I would rather have it and not need it than to need it and not have it

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