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01-11-2016, 03:32 PM
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#1 |
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Registered User
Join Date: Jan 2016
Location: Cjarlotte, NC
Posts: 7
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Rear End Gears
All, my first time on this site. Looks to be a very informative place. I am just about finished rebuilding the mechanicals on a 68 c10 SWB. Before I can order a new transmission I need to figure out what size gears I have in the rear end. Any idea how to do this?
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01-11-2016, 03:49 PM
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#2 |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,633
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Re: Rear End Gears
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Here is a link to the ratio charts I posted. http://67-72chevytrucks.com/vboard/s...d.php?t=578793 Posts #8 & #19 show the location where the code numbers should be stamped depending on which rear end assembly you have. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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01-11-2016, 04:14 PM
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#3 |
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Registered User
Join Date: Jan 2016
Location: Cjarlotte, NC
Posts: 7
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Re: Rear End Gears
Outstanding, Thanks! This is exactly what I was looking for. I'll let you know how I make out and post some pics. So far I have installed all new stainless brake and gas lines, tubular front lower and upper arms, new steering linkage and gear box, Airbags, C-notch, new 350HO turn key GM crate engine and new Vintage air system.
Great to have a place to get more info! |
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01-11-2016, 04:24 PM
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#4 |
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Registered User
Join Date: Jan 2016
Location: Cjarlotte, NC
Posts: 7
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Re: Rear End Gears
Here are a few pics
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01-11-2016, 07:46 PM
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#5 |
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Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,279
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Re: Rear End Gears
Awesome job so far it looks like a blast
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01-11-2016, 09:03 PM
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#6 |
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Registered User
Join Date: Jan 2016
Location: San Jose, CA
Posts: 68
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Re: Rear End Gears
Pretty!
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Dennis '70 CST/10 '55 Bel Air wagon |
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01-15-2016, 02:15 PM
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#7 |
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Registered User
Join Date: Jan 2016
Location: Cjarlotte, NC
Posts: 7
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Re: Rear End Gears
LocDoc, Thanks again for the VIN decoders. I looked at my vin and it does not match the decoder for my year.
My VIN is: CS148S169004 I get the CS1 as being a C-10 6 cylinder but the 48S does not make any sense. Any thoughts? |
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01-15-2016, 02:37 PM
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#8 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Rear End Gears
CS148S169004
C Conventional 2WD S Six Cylinder 1 1/2 Ton 4 Pickup 8 1968 S St Louis 169004 Sequence number I still thnk this forum needs a "thanks" button! Or a "useful" button. Or a "You decoded it wrong, dummy" button.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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01-15-2016, 02:45 PM
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#9 |
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Registered User
Join Date: Jan 2016
Location: Cjarlotte, NC
Posts: 7
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Re: Rear End Gears
Well done Davepl. Thanks!
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01-15-2016, 03:18 PM
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#10 | |
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Registered User
Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
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Re: Rear End Gears
Quote:
To my understanding all these series of (C10) trucks that came from the factory with a 6 cylinder got a 3.73:1 differential gear as standard equipment. That said, had it come with a V-8 (option), I believe the default (standard) gear ratio would then have been 3.07:1. The only caveat to this would be if your SPID called out for something specifically ordered unique or non-standard (ie: 4:11 or a 3.73 in a V-8 truck, etc). All Good Coley 
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....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 |
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01-15-2016, 03:44 PM
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#11 |
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Registered User
Join Date: Jan 2016
Location: Cjarlotte, NC
Posts: 7
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Re: Rear End Gears
Thanks Coley, I was able to get the code of the axel and it confirms it has 373 gears. The next step for me is to find out what size tires I should run to get the best performance and economy with these gears.
Thanks! |
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01-15-2016, 06:30 PM
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#12 |
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Senior Member
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,883
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Re: Rear End Gears
Nice Project Mike. Which transmission are you planning to get?
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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01-16-2016, 11:26 AM
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#13 |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,353
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Re: Rear End Gears
The taller the tire, the lower your RPMs at cruise speed. You might want to keep that in mind if you are going with an OD trans.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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01-18-2016, 12:41 PM
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#14 |
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Registered User
Join Date: Jan 2016
Location: Cjarlotte, NC
Posts: 7
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Re: Rear End Gears
I am going with a 700r4 from Phoenix transmission. They custom build one for you based on the rear end gears and the size of your tires. They also have designed it specifically for the ZZ4 GM crate engine.
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01-18-2016, 12:51 PM
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#15 |
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Senior Member
Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Rear End Gears
Is the rear end a Positrack? "If it aint, it outa be" with that motor and transmission...Looks good!
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" 
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01-31-2016, 01:43 AM
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#16 |
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Registered User
Join Date: Jul 2012
Location: Rio Rico, AZ
Posts: 43
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Re: Rear End Gears
Beautiful truck!
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69 Driver - The Analog Truck |
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