Is it possible? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C10_ustacould · 10-07-2012, 10:22 PM

Well, I guess almost anything is possible, but I digress. Could my truck, a '68 C10 swb stepside which was originally a 6cyl/3ott, have come with a factory installed 4.56 gear?

AirSpeed · 10-07-2012, 11:00 PM

I think it would be very possible and would look very cool! Just make it like a Blazer opening. I don't know if a Blazer uses different hardware in the door to support the glass and keep it from flopping around while the door is open. Look at a Blazer and go from there!
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AirSpeed · 10-07-2012, 11:04 PM

The above comment ended up on the wrong thread.
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67c10rustbuket · 10-07-2012, 11:05 PM

Have you checked the spid and stamping on the pass axle tube? Thats one heck of a gear!

C10_ustacould · 10-08-2012, 12:00 AM

Nothing on the SPID about the gear, going to verify my RPM at 55 and then reverse engineer the gear using a final drive RPM calculator on the net. Will know more soon.

SS Tim · 10-08-2012, 12:01 AM

3.73 would have been stock. 4.11 was the optional deep ratio. If that truck has factory 4.56 gears they would likely be on the SPID as a 4000 or 9000 series special equipment option aka COPO/fleet. They are listed in the gear code chart for '68 C/10 G/10s as a posi ratio. Did you look for a housing code or pull the cover and count teeth?

C10_ustacould · 10-08-2012, 12:31 AM

I'll try for a housing code, as the only time I had the cover off I forgot to count the teeth.

If there is no code on the housing, I will have to rely on the mph vs rpm vs tire size calculators here on the net.

GASoline71 · 10-08-2012, 09:41 AM

Or jack the rear up, put truck in gear (not running), spin the tire by hand and count the revolutions of the drive shaft.

Gary

cdowns · 10-08-2012, 10:05 AM

you could treat your truck nice and remove cover clean everything up and put nice new gearoil in it after u count the teeth

haminator · 10-08-2012, 10:13 AM

Counting the drive shaft revolutions and tire revolutions is prolly the easiest. Just remember someone hasto hold the other tire if its not a posi. One revolution on the tire if its posi and two revolutions if its open. Simple and accurate.

**Stocker** · 10-08-2012, 11:42 AM

Quote:

Originally Posted by haminator

Just remember someone hasto hold the other tire if its not a posi.

Just jack up one side

GMCJOE · 10-08-2012, 12:02 PM

I say pull the cover off, look for the stamp that is on the gears. Then you will know for sure. The axle tube stamp will tell you, but you have no for sure way of knowing if that is correct or not. Could have been swapped out at some time.

haminator · 10-08-2012, 01:13 PM

I always jack up both sides to see if its a posi, then have a sad face when its not lol

C10_ustacould · 10-08-2012, 01:27 PM

Drove the truck this morning to record the RPM vs MPH and used a calculator online to establish that it is a 3.73 gear. I have 29" tall tires and at 65 the RPM is 2000. Thanks for the input gentlemen. I have to go drive my truck now!

10-07-2012, 10:22 PM	#1
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,877	Is it possible? Well, I guess almost anything is possible, but I digress. Could my truck, a '68 C10 swb stepside which was originally a 6cyl/3ott, have come with a factory installed 4.56 gear? __________________ Buck Instagram: C10_ustacould 1963 SWB Fleet Side 528 Desert Beige Milly 1967 SWB Step Side 506 Medium Blue The Old Girl 1968 SWB Fleet Side 503 Light Green Ellie SOLD 1965 SWB Fleet Side 507 Light Blue Prescription Strength SOLD 1971 SWB Fleet Side 521 White Shiro SOLD 1968 SWB Step Side 503 Light Green My Old Farm Truck SOLD Last edited by C10_ustacould; 10-07-2012 at 10:46 PM.

10-07-2012, 11:00 PM	#2
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: Is it possible? I think it would be very possible and would look very cool! Just make it like a Blazer opening. I don't know if a Blazer uses different hardware in the door to support the glass and keep it from flopping around while the door is open. Look at a Blazer and go from there! Posted via Mobile Device __________________ http://smg.photobucket.com/albums/v655/aaronhero/

10-07-2012, 11:04 PM	#3
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: Is it possible? The above comment ended up on the wrong thread. Posted via Mobile Device __________________ http://smg.photobucket.com/albums/v655/aaronhero/

10-07-2012, 11:05 PM	#4
67c10rustbuket Registered User Join Date: Apr 2011 Location: Mustang, Oklahoma Posts: 2,806	Re: Is it possible? Have you checked the spid and stamping on the pass axle tube? Thats one heck of a gear! __________________ Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car

10-08-2012, 12:00 AM	#5
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,877	Re: Is it possible? Nothing on the SPID about the gear, going to verify my RPM at 55 and then reverse engineer the gear using a final drive RPM calculator on the net. Will know more soon. __________________ Buck Instagram: C10_ustacould 1963 SWB Fleet Side 528 Desert Beige Milly 1967 SWB Step Side 506 Medium Blue The Old Girl 1968 SWB Fleet Side 503 Light Green Ellie SOLD 1965 SWB Fleet Side 507 Light Blue Prescription Strength SOLD 1971 SWB Fleet Side 521 White Shiro SOLD 1968 SWB Step Side 503 Light Green My Old Farm Truck SOLD

10-08-2012, 12:01 AM	#6
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Is it possible? 3.73 would have been stock. 4.11 was the optional deep ratio. If that truck has factory 4.56 gears they would likely be on the SPID as a 4000 or 9000 series special equipment option aka COPO/fleet. They are listed in the gear code chart for '68 C/10 G/10s as a posi ratio. Did you look for a housing code or pull the cover and count teeth? Attached Images __________________ 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

10-08-2012, 12:31 AM	#7
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,877	Re: Is it possible? I'll try for a housing code, as the only time I had the cover off I forgot to count the teeth. If there is no code on the housing, I will have to rely on the mph vs rpm vs tire size calculators here on the net. __________________ Buck Instagram: C10_ustacould 1963 SWB Fleet Side 528 Desert Beige Milly 1967 SWB Step Side 506 Medium Blue The Old Girl 1968 SWB Fleet Side 503 Light Green Ellie SOLD 1965 SWB Fleet Side 507 Light Blue Prescription Strength SOLD 1971 SWB Fleet Side 521 White Shiro SOLD 1968 SWB Step Side 503 Light Green My Old Farm Truck SOLD

10-08-2012, 10:05 AM	#9
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Is it possible? you could treat your truck nice and remove cover clean everything up and put nice new gearoil in it after u count the teeth __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-08-2012, 10:13 AM	#10
haminator Registered User Join Date: Sep 2009 Location: Prescott Valley AZ Posts: 345	Re: Is it possible? Counting the drive shaft revolutions and tire revolutions is prolly the easiest. Just remember someone hasto hold the other tire if its not a posi. One revolution on the tire if its posi and two revolutions if its open. Simple and accurate.

10-08-2012, 12:02 PM	#12
GMCJOE Registered User Join Date: Aug 2012 Location: Junction City, KS Posts: 782	Re: Is it possible? I say pull the cover off, look for the stamp that is on the gears. Then you will know for sure. The axle tube stamp will tell you, but you have no for sure way of knowing if that is correct or not. Could have been swapped out at some time. __________________ Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust

10-08-2012, 01:13 PM	#13
haminator Registered User Join Date: Sep 2009 Location: Prescott Valley AZ Posts: 345	Re: Is it possible? I always jack up both sides to see if its a posi, then have a sad face when its not lol

10-08-2012, 01:27 PM	#14
C10_ustacould A day late and $1 short... Join Date: Dec 2008 Location: Northwest FL Posts: 3,877	Re: Is it possible? Drove the truck this morning to record the RPM vs MPH and used a calculator online to establish that it is a 3.73 gear. I have 29" tall tires and at 65 the RPM is 2000. Thanks for the input gentlemen. I have to go drive my truck now! __________________ Buck Instagram: C10_ustacould 1963 SWB Fleet Side 528 Desert Beige Milly 1967 SWB Step Side 506 Medium Blue The Old Girl 1968 SWB Fleet Side 503 Light Green Ellie SOLD 1965 SWB Fleet Side 507 Light Blue Prescription Strength SOLD 1971 SWB Fleet Side 521 White Shiro SOLD 1968 SWB Step Side 503 Light Green My Old Farm Truck SOLD



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