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10-04-2012, 12:25 PM
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#1 |
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Registered User
Join Date: Jun 2010
Location: Russellville, KY
Posts: 956
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K20 Gear Ratio Question
Anybody know the standard gear ratio for a 72 K20 w/ auto transmission? It seems pretty low-geared on the highway, and I'm thinking I may want to swap the gears out for something a little more highway friendly. Any suggestions on a replacement ratio?
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1979 Silverado C10 Shortbox - Photo Album 1977 Silverado K20 Camper Special - Photo Album 1972 C10 Custom Deluxe Highlander - sold 1971 Cheyenne Super Longhorn -sold 1972 Cheyenne Super SWB 4x4 -sold, bought back, sold again... I'm dumb. 1970 Chevy C10 SWB "Sprout" -sold 1972 Cheyenne K20 -sold 1969 GMC Shortbox Stepside 4x4 -sold 1972 GMC Jimmy 4x4 -sold |
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10-04-2012, 03:19 PM
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#2 |
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Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,507
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Re: K20 Gear Ratio Question
4.10
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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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10-04-2012, 04:03 PM
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#3 | |
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Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: K20 Gear Ratio Question
Quote:
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Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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10-04-2012, 04:55 PM
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#4 |
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Registered User
Join Date: Jun 2010
Location: Russellville, KY
Posts: 956
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Re: K20 Gear Ratio Question
Cool, thanks Tim! That's what I was thinking it was supposed to be, but I couldn't find the verification anywhere.
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1979 Silverado C10 Shortbox - Photo Album 1977 Silverado K20 Camper Special - Photo Album 1972 C10 Custom Deluxe Highlander - sold 1971 Cheyenne Super Longhorn -sold 1972 Cheyenne Super SWB 4x4 -sold, bought back, sold again... I'm dumb. 1970 Chevy C10 SWB "Sprout" -sold 1972 Cheyenne K20 -sold 1969 GMC Shortbox Stepside 4x4 -sold 1972 GMC Jimmy 4x4 -sold |
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10-04-2012, 09:44 PM
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#5 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: K20 Gear Ratio Question
That's the tallest gears you get with that rear.
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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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10-04-2012, 09:54 PM
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#6 | |
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Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: K20 Gear Ratio Question
Unless he has a Dana 60.
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1966 F250 4X4 416 1972 K20 350 4 OTF Quote:
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10-04-2012, 10:10 PM
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#7 |
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Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,507
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Re: K20 Gear Ratio Question
A Dana 60 stock on a '72 K20 ?????
__________________
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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10-04-2012, 11:04 PM
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#8 |
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Registered User
Join Date: Jun 2010
Location: Russellville, KY
Posts: 956
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Re: K20 Gear Ratio Question
Nope, its the round cover GM 10 bolt rear end. I'll probably just get used to them. I have the 70 2wd C10 that I'll probably do the bulk of my highway driving in anyway!
__________________
1979 Silverado C10 Shortbox - Photo Album 1977 Silverado K20 Camper Special - Photo Album 1972 C10 Custom Deluxe Highlander - sold 1971 Cheyenne Super Longhorn -sold 1972 Cheyenne Super SWB 4x4 -sold, bought back, sold again... I'm dumb. 1970 Chevy C10 SWB "Sprout" -sold 1972 Cheyenne K20 -sold 1969 GMC Shortbox Stepside 4x4 -sold 1972 GMC Jimmy 4x4 -sold |
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10-04-2012, 11:06 PM
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#9 | |
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Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: K20 Gear Ratio Question
Quote:
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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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08-24-2013, 09:21 AM
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#10 | |||
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: K20 Gear Ratio Question
I'm a little late here but good chart Tim, thanks for posting.
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore  )86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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