3 speed to SM465 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dubie · 04-22-2003, 04:35 PM

Is there any difference in the clutch on these trannies? My 3 speed is running a 10" clutch, what does the SM 465 have? I was just given an SM 465 out of a 67 that a buddy was gonna throw to the dump, and was looking at swapping the 3 speed out for this one. I have a brand new 10" clutch to go into the 3 speed but wanna know if i can use it in a 4 speed

**Yukon Jack** · 04-22-2003, 04:45 PM

When I researched replacing my three speed with an SM465, back when I wasn't going to go to a big block, it did not look like the clutch needed to be changed. However I was told by some that the bellhousing for the 3 speed might not work with the 4 speed. I think it was a guy at Advance Adapters who said the hole for the 3 speed tranny was smaller than the hole for the 4 speed. I had many on the board disagree. Never found out as I swapped in the big block.

On a different note, are you sure it's an 465 rather than a 420. I thought the 420's were used in 67?

bpmcgee · 04-22-2003, 04:45 PM

If I recall, the 71 blazer with the 350 and the SM465 had an 11" clutch.

Brian

Class of 69 · 04-22-2003, 04:58 PM

The input shaft is the same size, and spline count...the clutch will work. The four speed's usually came with an 11 inch heavy duty clutch because the trans was rated heavy duty. Like YuKon said, the bellhousing may be a problem, but you should be able to find one fairly reasonably priced. The bellhousings are interchangable on the motor. Should be a bolt in swap...except for a hole in the floor for shifter. Will also need a high hump floor panel , but I think all standard transmission trucks came with it. Obvious question is..why was he going to throw it away?? Is it in good condition, or in need of repair?

dubie · 04-22-2003, 05:13 PM

It's in perfect working order, he is just sick of looking at it

Oh, it comes with the bell housing

I am looking at buying a 71 LWB rolling chassis fro him as well, and it has a 67 CMC cab and a 68 GMC front clip on it. No motor and tranny. Should be bale to get it for 2 or 300 bucks

it's his posi I am looking at getting as well in another posting i just did, except he tossed this complete 67 rolling chassis to the dump and i'm gonna go rob the posi for free

Will I need to move the tranny crossmember if I am putting my small block in the I-6 location?

dubie · 04-23-2003, 08:07 AM

anyone know the answer to my last question?

toms68cst · 04-23-2003, 08:24 AM

I just ordered a new disk for my factory 68 CH465 and it was a 12 inch disk. I'd beef it up if you are also upgrading to a SB. I think the bells are the same. I've got my clutch all apart right now if you need any pictures or to compare parts.

I'm not sure about the engine mounting. All I could do is help you replicate the factory 4 speed config.

crazy longhorn · 04-23-2003, 08:41 AM

Bell housing hole size.....67 & older were 4.683(same as car). 68 up are a 5.126 hole, & that doesnt matter if its a 3spd, or 4 spd(go by the yr). The 10" clutch will work, its just not as heavy as an 11 or 12 " setup. on the crossmember, if you are using the I6 stands , the bell crossmember will be in the proper location to mount the sb in I 6 position. I like to drill the eng mount holes(in the stands) to 5/8" to help with assembly, & give a little room to "cheat" the final position. Good luck,crazyL

dubie · 04-23-2003, 09:18 AM

what about the drive shaft , will it need to be changed?

crazy longhorn · 04-23-2003, 09:21 AM

Yes, the 4 spd is shorter than the 3 speeds.....so you will have d shaft lenght issues......crazyL

04-22-2003, 04:35 PM	#1
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	3 speed to SM465 Is there any difference in the clutch on these trannies? My 3 speed is running a 10" clutch, what does the SM 465 have? I was just given an SM 465 out of a 67 that a buddy was gonna throw to the dump, and was looking at swapping the 3 speed out for this one. I have a brand new 10" clutch to go into the 3 speed but wanna know if i can use it in a 4 speed __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-22-2003, 04:45 PM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	When I researched replacing my three speed with an SM465, back when I wasn't going to go to a big block, it did not look like the clutch needed to be changed. However I was told by some that the bellhousing for the 3 speed might not work with the 4 speed. I think it was a guy at Advance Adapters who said the hole for the 3 speed tranny was smaller than the hole for the 4 speed. I had many on the board disagree. Never found out as I swapped in the big block. On a different note, are you sure it's an 465 rather than a 420. I thought the 420's were used in 67? __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

04-22-2003, 04:58 PM	#4
Class of 69 Registered User Join Date: Mar 2003 Location: Stillwater MN Posts: 1,166	The input shaft is the same size, and spline count...the clutch will work. The four speed's usually came with an 11 inch heavy duty clutch because the trans was rated heavy duty. Like YuKon said, the bellhousing may be a problem, but you should be able to find one fairly reasonably priced. The bellhousings are interchangable on the motor. Should be a bolt in swap...except for a hole in the floor for shifter. Will also need a high hump floor panel , but I think all standard transmission trucks came with it. Obvious question is..why was he going to throw it away?? Is it in good condition, or in need of repair? __________________ 69 GMC K10 ..some restoration required....still..

04-22-2003, 05:13 PM	#5
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	It's in perfect working order, he is just sick of looking at it Oh, it comes with the bell housing I am looking at buying a 71 LWB rolling chassis fro him as well, and it has a 67 CMC cab and a 68 GMC front clip on it. No motor and tranny. Should be bale to get it for 2 or 300 bucks it's his posi I am looking at getting as well in another posting i just did, except he tossed this complete 67 rolling chassis to the dump and i'm gonna go rob the posi for free Will I need to move the tranny crossmember if I am putting my small block in the I-6 location? __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-23-2003, 08:07 AM	#6
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	anyone know the answer to my last question? __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-22-2003, 04:45 PM	#3
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	If I recall, the 71 blazer with the 350 and the SM465 had an 11" clutch. Brian

04-23-2003, 08:24 AM	#7
toms68cst Registered User Join Date: Jun 2000 Location: Bismarck, ND Posts: 4,296	I just ordered a new disk for my factory 68 CH465 and it was a 12 inch disk. I'd beef it up if you are also upgrading to a SB. I think the bells are the same. I've got my clutch all apart right now if you need any pictures or to compare parts. I'm not sure about the engine mounting. All I could do is help you replicate the factory 4 speed config. __________________ Unrestored 68 C-10 CST. Original 327. 4-Speed CH465. 50k or so miles. TREASURER, Drum Brake Club.

04-23-2003, 08:41 AM	#8
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Bell housing hole size.....67 & older were 4.683(same as car). 68 up are a 5.126 hole, & that doesnt matter if its a 3spd, or 4 spd(go by the yr). The 10" clutch will work, its just not as heavy as an 11 or 12 " setup. on the crossmember, if you are using the I6 stands , the bell crossmember will be in the proper location to mount the sb in I 6 position. I like to drill the eng mount holes(in the stands) to 5/8" to help with assembly, & give a little room to "cheat" the final position. Good luck,crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

04-23-2003, 09:18 AM	#9
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	what about the drive shaft , will it need to be changed? __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-23-2003, 09:21 AM	#10
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Yes, the 4 spd is shorter than the 3 speeds.....so you will have d shaft lenght issues......crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....



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