1972 GMC Gear Ratio - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jlampka · 01-13-2019, 01:46 PM

Howdy - just bought a 1972 402 ci, TH400 1 Ton pickup. What rear end gear ratios came on this truck? Thank you!

**Already Gone** · 01-13-2019, 07:08 PM

Looks like 4:10's

**68350** · 01-13-2019, 11:19 PM

Interesting to note a 3/4 ton big block auto had 3.54 standard. I’m surprised they changed to 4.10 for a one ton

1972RedNeck · 01-13-2019, 11:36 PM

IS the OP's truck a single wheel or dually? I bet it makes a difference...

**jocko** · 01-13-2019, 11:48 PM

3.54 not available in a C30. 4.10 was standard for all V8 C30s from 6600-14000 GVWR, with the exception of those equipped with the H22/H23 11000 lb axle, which could have 5.43 or 6.17.

**special-K** · 01-14-2019, 08:02 AM

No Dana 60s in C/30s.

01-13-2019, 01:46 PM	#1
jlampka Registered User Join Date: Sep 2013 Location: North Tonawanda, NY Posts: 236	1972 GMC Gear Ratio Howdy - just bought a 1972 402 ci, TH400 1 Ton pickup. What rear end gear ratios came on this truck? Thank you!

01-13-2019, 07:08 PM	#2
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: 1972 GMC Gear Ratio Looks like 4:10's Attached Images __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

01-13-2019, 11:19 PM	#3
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	Re: 1972 GMC Gear Ratio Interesting to note a 3/4 ton big block auto had 3.54 standard. I’m surprised they changed to 4.10 for a one ton __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

01-13-2019, 11:48 PM	#5
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,975	Re: 1972 GMC Gear Ratio 3.54 not available in a C30. 4.10 was standard for all V8 C30s from 6600-14000 GVWR, with the exception of those equipped with the H22/H23 11000 lb axle, which could have 5.43 or 6.17.

01-14-2019, 08:02 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1972 GMC Gear Ratio No Dana 60s in C/30s. __________________ "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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