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#1 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Some factory C10 equipment Q's
Hey all I have a 1970 C10 LWB 2wd and the PO did ALOT of changing things around. It currently has a 355/th400 and the rest is stock factory running gear which I'm trying to identify today. There was definitely a manual transmission in the truck at one point, the crossmember for that was cut and you can still see the part bolted to the frame. If it was a manual trans from the factory, wouldn't that garauntee it was also an I6 motor? And if THAT is so, would that garauntee that it's a 3.73 rear?
I was under it yesterday chasing a bolt in exhaust system rattle, and I started wondering about drivelines in these long bed trucks. I've never seen a LWB truck that had a one peice driveline. All the ones I peeked under had those two-peice drivelines that were connected at a round cutout in a crossmember. Are there factory one peice drivelines in 1/2 ton LWB trucks? |
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#2 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Some factory C10 equipment Q's
Time to do some research. If the VIN prefix is CE it was a V8 and CS would have beeen a L6.
The powertrain charts and decoders linked in my signature should be a good start on what was what. Then we can figure out the details. But a manual 3OTT or four speed could have been had behind even a 396 in a 70C10.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#3 |
1972 K20
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Location: Greenfield MN
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Re: Some factory C10 equipment Q's
I bought a 72 C10 LWB a few years back, and it also had a single driveshaft in it. The PO put a long tail shaft TH350 in it. I drove it home 1100 miles with no drive train problems and didn't vibrate up to 90mph anyway.
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#4 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Some factory C10 equipment Q's
I've been trying to get the paint off the SPID, only thing I see are these. Sorry for the black paint in the pic, PO obviously didn't give a darn about this truck, kinda ticks me off somebody would do that.
B85 body side moulding BX2 B side moulding-WIDE lwr 622 gold vinyl trim. 534 white and medium olive |
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#5 |
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Join Date: Nov 2015
Location: Colfax California
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Re: Some factory C10 equipment Q's
The vin is definetly a CE. Pretty cool that the warranty and Owner Protection Plan made it 44 years under the seat pretty much hidden until I found the truck.
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#6 |
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Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Some factory C10 equipment Q's
Factory 307/3OTT truck. There shouldn't be any engine emblems on the fenders. Colors were nice, Medium Olive and White in a conventional two-tone (white roof and door window frames). The gold trim was actually an ivory color and one year only. It isn't reproduction gold or parchment as a FYI.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#7 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Some factory C10 equipment Q's
According to the VIN and Model decoders I got that it was a V8, long bed fleet, 1/2 ton, from Atlanta, 2wd.
The weird thing is that it has a manual trans crossmember that's been cut out, and it has a column shift |
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#8 | |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Some factory C10 equipment Q's
Quote:
What's the side mounding? It's primered grey but I can see down the side where there must have been rivets to hold trim on. Would it have been the 3-4" wide nice trim? It could've been any V8 then? And 3.07 rear with no posi I'm guessing, and a 10 bolt? Did they come with a one peice drive shaft? Last edited by Mrturner1; 04-24-2016 at 07:58 PM. |
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#9 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: Some factory C10 equipment Q's
One piece vs two piece is determined by the shaft critical speed.
Inputs to critical speed calculations include: wheelbase, shaft overall length, shaft material, tube diameter and wall thickness, rear axle ratio, tire diameter and anticipated vehicle top speed, as well as any unforeseen system resonances discovered during physical testing. Changing any of those can make the difference between a particular model getting a one piece or a two piece shaft. I could envision a small displacement 2wd lwb truck getting a once piece shaft, especially with a lower numerical rear axle ratio, due to a potentially lower top speed and the slower shaft rpm due to the axle ratio. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 04-25-2016 at 07:29 AM. |
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#10 | |||
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Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Some factory C10 equipment Q's
Quote:
Not sure why it is weird. I've seen all sorts of butchery under the pretense of improvement. The fact is the truck was built with a three-speed column shift manual transmission. Quote:
Quote:
Again clearly it was built with a 307 2bbl V8 and a three-speed transmission. Per the published powertrain charts it would have been built with an H035(12 bolt) open (non-posi) 3.73:1 rear end on coil springs. There were a number of driveshaft combinations both single and multiple section. Without research I cannot tell you exactly what it had.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#11 |
Special Order
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Location: Mt Airy, MD
Posts: 85,858
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Re: Some factory C10 equipment Q's
The manual transmission came with any engine offers...as standard equipment. Automatic was an option straight across the board. The driveshaft could be custom since the truck has been altered. To tell of a 6 to 8 swap look at the motor mount towers where they bolt to the frame (2 bolts each side), is there another hole ahead or behind? Many who swap an 8 from a 6 don't move those, so that can be a tell tale. The 6 cyls only had a fan protector and the 8 cyls had a shroud. The top radiator clamps is where the shroud attaches and 6cyls wouldn't have clip nuts. A manual to auto telltale is often seeing if there there is a clutch linkage block-off. Columns can be swapped. In fact, a total drivetrain swap can be done to look factory. Everything is interchangeable. Many would cut that manual crossmember when going to automatic when it could be removed with a little more work. The manual bellhousing would have bosses to mount to that crossmember where automatics span to the tailshaft housing where it mounts to that crossmember.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 04-26-2016 at 07:52 AM. |
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#12 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: Some factory C10 equipment Q's
Quote:
These examples do give an idea of the amount of detail that goes into defining the driveshaft system. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 04-26-2016 at 09:12 AM. |
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#13 | |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Some factory C10 equipment Q's
Quote:
Well the good news is it's already got a 3.73 rear. It's got to much body work (dimples and dings) for me to want to restore it so I recently rebuilt the 355cid that's in it. Did some decent heads and a big ole rumpity 280H cam, RPM manifold and 650avs carb. It has a th400 in it and my next project was to put a big stall converter in it and build the rear end with 3.73's and a tru trac posi. The rear end cost just got cut in half with this peice of news ![]() ![]() |
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#14 |
Special Order
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Location: Mt Airy, MD
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Re: Some factory C10 equipment Q's
In the 67-72 GM Truck world 307 = engine and 3.08 = gears. No 3.07 gears in trucks
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#15 |
Registered User
Join Date: Dec 2009
Location: bisbee, arizona
Posts: 1,529
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Re: Some factory C10 equipment Q's
if it helps at all.....my 72 c10 307 3 spd on the column. has the two piece drive shaft I dont think it was that unusual back then. might be kinda rare now.
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#16 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Some factory C10 equipment Q's
How can you guys tell it's a 307cid truck with a 3.73 rear though? I looked at the decoder and the charts but I don't understand how you guys are getting that information
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#17 | |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Some factory C10 equipment Q's
Quote:
You stated the VIN prefixes CE, that tells us its a Cheverolet conventional with a V8 engine. This is shown in the VIN decoders linked and thousands of other places. You provided a SPID that does not indicate an engine or transmission option. As such the truck was built in a base or default configuration. For a 70 C/10, 1/2 ton truck the base V8 was a 307 2bbl engine. The base transmission was a column shift manual three speed. If you were to look at the powertrain charts linked ( http://67-72chevytrucks.com/vboard/s...7&postcount=10 ), you will see that a 70 C/10 with a 307 and a three speed manual transmission was assembled with a 3.73:1 rear end ratio. 3.07 and 4.11 as well as positraction were all optional. However your SPID again does not indicate that any of these powertrain options were selected. Now the important thing to remember here is this is how the truck was built in 1969/70. What you have now is up to you to determine.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban Last edited by SS Tim; 04-27-2016 at 04:13 AM. |
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#18 |
Special Order
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Location: Mt Airy, MD
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Re: Some factory C10 equipment Q's
It's real simple. 3spd was standard and 3.73 ratio was standard with 3spd. Optional transmissions and ratios will be listed as options.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#19 | |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Some factory C10 equipment Q's
Quote:
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