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clay Moderator

Joined: 24 Nov 2002 Posts: 3209 Location: South Carolina 318129.23 points
1972 Chevrolet Nova
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Posted: Tue Sep 20, 2011 9:54 pm Post subject: Transmission info needed |
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I'm finally done with the cam swap in my cousin's Vortec 350 and need some help to get it installed in his truck. I need to know what the designation is for the transmission in his truck to buy a flywheel / clutch / pressure plate package. He has a 1983 4wd 1/2 ton pickup with a 305. It's a 4 speed granny low transmisson. On the shifter it has L - 1 -2- 3. It is the original transmission. I know what the flywheel needs to be but I know very little about manual transmissions. If there are any identifying marks or traits you need that may be on the case, etc., let me know. Thanks, Clay. _________________ I have done so much with so little for so long, I can now do anything with nothing. |
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af2 Member

Joined: 01 Sep 2003 Posts: 5568 Location: grassvalley, ca 71528.86 points
1933 Willys Coupe
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Posted: Wed Sep 21, 2011 6:24 pm Post subject: |
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Clay, I don't know what you mean but>>>
Run a 11" diaphragm clutch so the pedal stays lite and you will be good.
You know the fly wheel is weighted?
My son put over 60,000 on his Vortec/ NP 4speed without a clutch change. He was not nice to it either as I made 3 different rear drive shafts that broke the U-joint with 5500rpm clutch drops, so he wouldn't borrow moms Tahoe!  |
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Big Dave Moderator

Joined: 04 Dec 2005 Posts: 2660 Location: Tampa Florida 120444.52 points
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Posted: Wed Sep 21, 2011 9:48 pm Post subject: |
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af2 wrote: | Clay, I don't know what you mean but>>>
Run a 11" diaphragm clutch so the pedal stays lite and you will be good.
You know the fly wheel is weighted?
My son put over 60,000 on his Vortec/ NP 4speed without a clutch change. He was not nice to it either as I made 3 different rear drive shafts that broke the U-joint with 5500rpm clutch drops, so he wouldn't borrow moms Tahoe!  |
Sounds like a Muncie SM-420 out of a medium duty truck. If so it will have a PTO plate on the lower side of the case. (check for images on Google). They were made from 1947 through 1967 so there are quite a few out there and they are still popular with 4x4 guys who like to crawl.
Big Dave |
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clay Moderator

Joined: 24 Nov 2002 Posts: 3209 Location: South Carolina 318129.23 points
1972 Chevrolet Nova
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Posted: Wed Sep 21, 2011 9:50 pm Post subject: |
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Yeah I have the flywheel part - it needs to be the external balance for a one piece seal crankshaft. But I don't know what the transmission input shaft configuration is to order the clutch disc (spline count and diameter). We can measure it when he does the swap, I was trying to get a jump on it and order parts first. Like I said, I just don't know how many different manuals could have been installed in his particular truck or what the identifying marks, characteristics are, etc. and am after hopefully some quick guidance as to what it might be. Automatics I have decent knowledge about, but manuals - not so much. I really need to crawl up under it and look around myself instead of trying to get info from him. I'll try to get some pics this weekend and that should help the indentifying process drastically. Clay _________________ I have done so much with so little for so long, I can now do anything with nothing. |
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af2 Member

Joined: 01 Sep 2003 Posts: 5568 Location: grassvalley, ca 71528.86 points
1933 Willys Coupe
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Posted: Wed Sep 21, 2011 11:07 pm Post subject: |
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83 will be the 10 spline. |
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SMOKEmUP PostMaster

Joined: 30 May 2002 Posts: 3171
65149.84 points
1979 Chevrolet Camaro
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Posted: Thu Sep 22, 2011 2:15 pm Post subject: |
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Based on what I could find it's a SM465 transmission.
SM465:
Make: GM Muncie
Length: 12"
Height: 18"
Weight: 175 lbs
Case: Cast iron
Top cover: Cast iron.
Gearing: 6.55, 3.58, 1.57, 1.0 _________________ Stop running from your pain and embrace your pain. Your pain is going to be a part of your prize.
I challenge you to push yourself. |
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clay Moderator

Joined: 24 Nov 2002 Posts: 3209 Location: South Carolina 318129.23 points
1972 Chevrolet Nova
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Posted: Thu Sep 22, 2011 8:10 pm Post subject: |
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Great! Hopefully that should be enough info for me to go on. If not, I'll be back..... Thanks af2 and Smoke. Clay _________________ I have done so much with so little for so long, I can now do anything with nothing. |
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