67-72 K10 gear ratios... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

martindc1 · 11-30-2012, 09:36 PM

I've been trying to find some information on what gear ratios were available in the 67-72 K10s. Does anybody have any documentation as to what the gear ratio options were for each year in the series?

**special-K** · 11-30-2012, 09:39 PM

There's available and what was standard. I'm pretty sure what was standard was 3.08s with automatic and 3.73 with manual. 4.10 was an option and maybe...maybe 4.56? (I'm kinda thinking no)

LONGHAIR · 12-01-2012, 01:43 PM

Longhornman has this down for sure as far as what is standard (because optional gears would be listed in the SPID) but I don't know if he includes 4x4s in that list? or even if they are different from the 2 wheelers?

**special-K** · 12-01-2012, 08:51 PM

From what I've seen,the ratios I listed are standard. I'm just not 100% positive on options other than 4.10 and 3.73 w/automatic. I've never seen a manual with 3.08.

69GWC · 12-01-2012, 09:46 PM

My 69 came with 3:73s and a 4sp.

Posted via Mobile Device

beardface · 12-01-2012, 11:33 PM

i can add 2 data points.
a 72 k20 with a sm465 and 4.10s, came with a 350.
and a 68 k20 with a sm420 and 4.56s, no engine option on the spid, could have had a 6cyl(?)

any others?

martindc1 · 12-02-2012, 12:58 AM

In this thread posted in October, about halfway down, somebody posted an image that looks like it is out of some sort of factory documentation for K20 gear ratios. Just above the K20 chart you can see what looks to be the bottom of the K10 chart:

http://67-72chevytrucks.com/vboard/s...d.php?t=546053

And here is a nice chart for the 73-87 trucks, the only drawback is that it doesn't break down what gear ratios came with what transmission options for the 73-80 trucks:

http://www.chuckschevytruckpages.com/73-87specs.html

RLONG · 12-04-2012, 05:43 PM

I have had a 72 surburban auto with 308 was standard 373 was option and with 6 cyl standard was the 373 410 was also a option.

Mike C · 12-04-2012, 09:02 PM

I have the Jimmy in my sig which was a SM465/3.08 posi from factory, and I have another '72 project that is about 1200 serial #'s different that is TH350/3.73. Not sure if Blazer/Jimmy translated to same as K/10 but would not surprise me.

BigRed76 · 01-10-2013, 01:38 PM

My '72 GMC K15 came auto from factory with a 3.73 gear option on the SPID...

yfs200p · 01-12-2013, 10:39 PM

My 72 short bed came with a SM465 and 3.73's

**D.PASSMORE** · 01-15-2013, 03:36 PM

My 72 Blazer / SM465 = 3.73 (stock)
My 72 3/4 T / TB350 w/HO72 = 4.10 (stock)
My 71 SWB / TB350 = 3.08 (stock) / now 4.10's

msgross · 01-15-2013, 04:08 PM

I think 4.56's were only for K-20's though...

my 68 K10 had 3.73's and a 4spd.

11-30-2012, 09:36 PM	#1
martindc1 Registered User Join Date: Jul 2009 Location: La Crosse, WI Posts: 218	67-72 K10 gear ratios... I've been trying to find some information on what gear ratios were available in the 67-72 K10s. Does anybody have any documentation as to what the gear ratio options were for each year in the series? __________________ Currently truckless, previous trucks: 67 K20, 87 K10 aka V10 & 72 C10

11-30-2012, 09:39 PM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: 67-72 K10 gear ratios... There's available and what was standard. I'm pretty sure what was standard was 3.08s with automatic and 3.73 with manual. 4.10 was an option and maybe...maybe 4.56? (I'm kinda thinking no) __________________ "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 ~

12-01-2012, 08:51 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: 67-72 K10 gear ratios... From what I've seen,the ratios I listed are standard. I'm just not 100% positive on options other than 4.10 and 3.73 w/automatic. I've never seen a manual with 3.08. __________________ "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 ~

12-01-2012, 09:46 PM	#5
69GWC Registered User Join Date: Jun 2012 Posts: 1,089	Re: 67-72 K10 gear ratios... My 69 came with 3:73s and a 4sp. Posted via Mobile Device

12-01-2012, 11:33 PM	#6
beardface Registered User Join Date: Aug 2010 Location: Albuquerque, NM Posts: 26	Re: 67-72 K10 gear ratios... i can add 2 data points. a 72 k20 with a sm465 and 4.10s, came with a 350. and a 68 k20 with a sm420 and 4.56s, no engine option on the spid, could have had a 6cyl(?) any others?

12-02-2012, 12:58 AM	#7
martindc1 Registered User Join Date: Jul 2009 Location: La Crosse, WI Posts: 218	Re: 67-72 K10 gear ratios... In this thread posted in October, about halfway down, somebody posted an image that looks like it is out of some sort of factory documentation for K20 gear ratios. Just above the K20 chart you can see what looks to be the bottom of the K10 chart: http://67-72chevytrucks.com/vboard/s...d.php?t=546053 And here is a nice chart for the 73-87 trucks, the only drawback is that it doesn't break down what gear ratios came with what transmission options for the 73-80 trucks: http://www.chuckschevytruckpages.com/73-87specs.html __________________ Currently truckless, previous trucks: 67 K20, 87 K10 aka V10 & 72 C10

12-04-2012, 05:43 PM	#8
RLONG Registered User Join Date: Oct 2008 Location: BROOKELAND,TX Posts: 228	Re: 67-72 K10 gear ratios... I have had a 72 surburban auto with 308 was standard 373 was option and with 6 cyl standard was the 373 410 was also a option.

12-04-2012, 09:02 PM	#9
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,714	Re: 67-72 K10 gear ratios... I have the Jimmy in my sig which was a SM465/3.08 posi from factory, and I have another '72 project that is about 1200 serial #'s different that is TH350/3.73. Not sure if Blazer/Jimmy translated to same as K/10 but would not surprise me. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

01-10-2013, 01:38 PM	#10
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: 67-72 K10 gear ratios... My '72 GMC K15 came auto from factory with a 3.73 gear option on the SPID... __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

01-12-2013, 10:39 PM	#11
yfs200p E.H.F.D Engine #2 Join Date: Feb 2003 Location: East Hampton, NY Long Island Posts: 916	Re: 67-72 K10 gear ratios... My 72 short bed came with a SM465 and 3.73's __________________ -NICK '72 K10 SWB Fleetside. Avocado Highlander 350-4speed-NP205 Frame Off Re-Creation '89 GMC V3500 C/C Flatbed Plow Truck 454/SM465/Np205 '15 Chevy 2500HD CCSB High Country Duramax '22 Tahoe Premier Duramax

01-15-2013, 03:36 PM	#12
D.PASSMORE One of the First Join Date: Jan 2000 Location: St. Augustine,FL. Posts: 4,049	Re: 67-72 K10 gear ratios... My 72 Blazer / SM465 = 3.73 (stock) My 72 3/4 T / TB350 w/HO72 = 4.10 (stock) My 71 SWB / TB350 = 3.08 (stock) / now 4.10's __________________ DAVID PASSMORE ST AUGUSTINE ,FL ZIP 32084 '71 SWB K/10 CUSTOM DELUXE (Chili) '72 BLAZER K/5 Muscle Truck (Mule) '72 LWB K/20 CHEYENNE (Blackie)

01-15-2013, 04:08 PM	#13
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 67-72 K10 gear ratios... I think 4.56's were only for K-20's though... my 68 K10 had 3.73's and a 4spd. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"



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