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#1 |
Registered User
Join Date: Aug 2013
Location: Poulsbo, WA
Posts: 21
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Attaching a 350 to original 4 speed manual trans
Hello again!
I'm now moving my project from the engine stand to the engine compartment...and I have a question about what I need to attach my newly rebuilt 350 engine to the original four speed gearbox. The truck is a 65 C10 with the "Granny" super low first gear. I figure I'll need a new flywheel and clutch pack. But do I need a new / different bell housing? Throw out mechanism? Adapters of any kind? My plan is to remove the gear box for a good cleaning and service, then drop the full engine/gearbox back into the truck together. Any advice? Are there other threads on this forum you can point me to? Thanks again for any help. Poulsbo |
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#2 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,257
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Re: Attaching a 350 to original 4 speed manual trans
I may be off-base, since I'm a '67-'72 monomaniac, but you should have the SM420 treansmission if it's the original 4-speed in a '65. The OEM bellhousing is GM p/n: [GM11]3815891 with a 4-9/16'' diameter opening.
It should bolt right up to any SBC, BBC or L6 made from the mid '60s to late '80s. The SM465, introduced in '68, takes a bellhousing with a 5-1/8'' I.D. but engine-mating bolt patterns are the same.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#3 |
Registered User
Join Date: Aug 2013
Location: Poulsbo, WA
Posts: 21
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Thanks '68OrangeSunshine,
Yea, it's the original 4-speed. Sounds like I should be good to go without too much "adapting." Good news. Appreciate the help. Poulsbo ![]() |
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#4 |
Registered User
![]() Join Date: Jun 2008
Location: Greenville, South Carolina
Posts: 150
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Re: Attaching a 350 to original 4 speed manual trans
One concern for a new engine. Be sure to check the back of the crank for a pilot bearing. If the crank has one in it, measure the input shaft OD before the splines and then measure the ID on the pilot to be positive they match. If not you will need to install one for the "65. I know different tranny's have different sizes, but, they all fit in the back of the crank. good luck
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72junky Don't worry my wife said it's ok. '72 K10 custom/10 350/4spd,ps,pb,ac,tilt,tach,3:73 posi,buddy buckets - driver '72 Cheyenne/10 swb 355/th350,factory black, loaded and lowered - toy '72 Cheyenne/10 lwb, 350/th350,ps,pb,ac,tilt - current project build '72 K5 Blazer CST 350/th350,ps,pb,ac,tilt,tach,3:73 posi - project rust bucket -Unfortunately Sold plus 4 others too ashamed to post |
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#5 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Attaching a 350 to original 4 speed manual trans
What engine was in there before the new 350?
As '68Orange Sunshine said no need for a different bellhousing. You are correct in needing a flywheel, clutch, pressure plate and throwout bearing assembly. You will also need the pilot bushing that 72junky mentioned. Even if the new 350 has one, remove it and install a new one. As for the clutch linkage, what you will need depends on what you now have. If the truck previously had a small block, then everything will bolt right up to the 350.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#6 |
Registered User
Join Date: Aug 2013
Location: Poulsbo, WA
Posts: 21
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Re: Attaching a 350 to original 4 speed manual trans
Great advice 72junky and Captainfab!
Previous engine was the original 283, which I'm going to rebuild and keep in case I ever want to sell the truck. I'll make sure the pilot bearing is new and matched to the kit. Sounds like the swap should be pretty straight forward. (Famous last words... ![]() Thanks again for the help. Poulsbo |
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#7 |
Registered User
Join Date: Jan 2013
Location: Eastern TN
Posts: 1,921
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Re: Attaching a 350 to original 4 speed manual trans
2 more things to check out. Most but not all small blocks are drilled for the clutch zbar next to the oil filter. Also check the front of the block beside the timing cover right above the pan, these were the front style engine mount holes originally and are often used for power steering pumps. When I swapped the 400 into my 72 I forgot to check them. It is a pain drilling the holes once it is sitting in the truck!
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#8 | |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Attaching a 350 to original 4 speed manual trans
Then you have everything you need for your 350. Just get the flywheel turned and install a new clutch, pressure plate and TO bearing.
Quote:
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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350 install, manual transmission |
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