Frame differences between k10 and k20.. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DuckhunterInTN · 07-14-2003, 05:20 PM

I was wondering what the frame differences were between a 69-72 K10 vs. a K20. What drivetrain components are typically found in a K20?

Lastly, does a K30 single rear wheel exist? How common is it to even find a K30 dually?

DuckhunterInTN · 07-14-2003, 09:39 PM

Anyone?

Rod · 07-14-2003, 10:33 PM

K30 single wheel and dually wheels do exist.. just not in the 67-72 vintage... very few trucks were converted to dullie 4x4's by out of house companies for certain customers like railway and timber companies in 67-72.

DuckhunterInTN · 07-15-2003, 12:11 AM

so basically, a (4wd) 69-72 k30 does not exist?

**JIMs70GMC** · 07-15-2003, 06:16 AM

Unless it has the NAPCO conversion like Rod said.

DuckhunterInTN · 07-15-2003, 09:17 AM

So is the truck owned by a fella named Tony with a white 69-ish 4wd chevy with a dually rearend and a flatbed (some pics of his truck are on GMCPaul's website) a converted K30 or just a K10/20 with a dually rearend and a flatbed?

**Yukon Jack** · 07-15-2003, 09:22 AM

That's my buddies truck. It is a C30 dually cab and frame and he swapped in the 4wd parts. He did an awesome job as the truck went thorugh a bad tornado before he bought it.

**CPNE** · 07-15-2003, 09:26 AM

Quote:

I was wondering what the frame differences were between a 69-72 K10 vs. a K20. What drivetrain components are typically found in a K20?

The frames are essentially the same from an interchangeablility standpoint.

A K20 will have a full floater rear, either a Dana 60 or an Eaton. It will also have a dana 44 front axle (67-69 closed knuckle, 70-72 open knuckle). FE suspension components (ball joints, axle shafts, etc) will be beefier on a 3/4 ton than comparable components on a 1/2 ton. Typical ratios are either 4:11 or 4:56. 70-up will have the NP205 xfer case and automatics were available. 67-69 used the Rockwell xfer case and no automatics were available. All engines were available except 396/402 BB. These include 250, 292, 283 (67), 327 (67/68), 307 (69-72), 350 (69-72).

Hope this addresses your question.

**Yukon Jack** · 07-15-2003, 10:01 AM

Here's another photo of my buddy's truck.

Tony's 1970 K30

DuckhunterInTN · 07-15-2003, 11:05 AM

Thanks for the info guys.

CPNE,
So are the frames themselves the same on the 10 and 20? Or is the 20 thicker and/or wider? I guess my question is could you upgrade drivetrain components on a 10 and make a true 20....not just a 10 w/ 20 components.

Yukon Jack,

Your friend Tony has one of the neatest 69-72's I have ever seen. Was the truck a cab chassis when he got it or did it have a bed?

**CPNE** · 07-15-2003, 11:09 AM

Quote:

So are the frames themselves the same on the 10 and 20?

Yes. There is no difference in thickness or width, the GVW difference is in the suspension components.

rambler · 07-15-2003, 11:27 AM

Great looking truck, I sure wish I had that to haul my hay with.

**Yukon Jack** · 07-17-2003, 10:17 AM

Tony says it was a cab and chassis truck as it has the narrow rear end. It had a stake bed on it when he bought.

badpeanut · 07-18-2003, 03:17 AM

Would a K20 have a TH350 or a TH400?

**CPNE** · 07-18-2003, 07:47 AM

Yes, I've heard of it but not seen it.

Blazer1970 · 07-18-2003, 07:56 AM

Quote:

Originally posted by badpeanut
Would a K20 have a TH350 or a TH400?

TH350. They did not use TH400s in 4WD applications until the mid '70s.

07-14-2003, 05:20 PM	#1
DuckhunterInTN Registered User Join Date: Feb 2003 Location: Brownsville, TN Posts: 88	Frame differences between k10 and k20.. I was wondering what the frame differences were between a 69-72 K10 vs. a K20. What drivetrain components are typically found in a K20? Lastly, does a K30 single rear wheel exist? How common is it to even find a K30 dually? __________________ 2004 GMC 2500HD 4x4 Crew Cab Duramax 2000 Chevrolet ext-cab Z71 1995 Chevrolet ext-cab Z71 1984 Chevrolet K10 6.2 4x4 1972 GMC Jimmy 4x4 1967 Chevrolet C50 Dump truck 1957 GMC 1/2 ton stepside (not running)

07-14-2003, 09:39 PM	#2
DuckhunterInTN Registered User Join Date: Feb 2003 Location: Brownsville, TN Posts: 88	Anyone? __________________ 2004 GMC 2500HD 4x4 Crew Cab Duramax 2000 Chevrolet ext-cab Z71 1995 Chevrolet ext-cab Z71 1984 Chevrolet K10 6.2 4x4 1972 GMC Jimmy 4x4 1967 Chevrolet C50 Dump truck 1957 GMC 1/2 ton stepside (not running)

07-14-2003, 10:33 PM	#3
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	K30 single wheel and dually wheels do exist.. just not in the 67-72 vintage... very few trucks were converted to dullie 4x4's by out of house companies for certain customers like railway and timber companies in 67-72. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

07-15-2003, 12:11 AM	#4
DuckhunterInTN Registered User Join Date: Feb 2003 Location: Brownsville, TN Posts: 88	so basically, a (4wd) 69-72 k30 does not exist? __________________ 2004 GMC 2500HD 4x4 Crew Cab Duramax 2000 Chevrolet ext-cab Z71 1995 Chevrolet ext-cab Z71 1984 Chevrolet K10 6.2 4x4 1972 GMC Jimmy 4x4 1967 Chevrolet C50 Dump truck 1957 GMC 1/2 ton stepside (not running)

07-15-2003, 06:16 AM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Unless it has the NAPCO conversion like Rod said. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

07-15-2003, 09:17 AM	#6
DuckhunterInTN Registered User Join Date: Feb 2003 Location: Brownsville, TN Posts: 88	So is the truck owned by a fella named Tony with a white 69-ish 4wd chevy with a dually rearend and a flatbed (some pics of his truck are on GMCPaul's website) a converted K30 or just a K10/20 with a dually rearend and a flatbed? __________________ 2004 GMC 2500HD 4x4 Crew Cab Duramax 2000 Chevrolet ext-cab Z71 1995 Chevrolet ext-cab Z71 1984 Chevrolet K10 6.2 4x4 1972 GMC Jimmy 4x4 1967 Chevrolet C50 Dump truck 1957 GMC 1/2 ton stepside (not running)

07-15-2003, 09:22 AM	#7
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	That's my buddies truck. It is a C30 dually cab and frame and he swapped in the 4wd parts. He did an awesome job as the truck went thorugh a bad tornado before he bought it. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

07-15-2003, 10:01 AM	#9
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Here's another photo of my buddy's truck. Tony's 1970 K30 __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

07-15-2003, 11:05 AM	#10
DuckhunterInTN Registered User Join Date: Feb 2003 Location: Brownsville, TN Posts: 88	Thanks for the info guys. CPNE, So are the frames themselves the same on the 10 and 20? Or is the 20 thicker and/or wider? I guess my question is could you upgrade drivetrain components on a 10 and make a true 20....not just a 10 w/ 20 components. Yukon Jack, Your friend Tony has one of the neatest 69-72's I have ever seen. Was the truck a cab chassis when he got it or did it have a bed? __________________ 2004 GMC 2500HD 4x4 Crew Cab Duramax 2000 Chevrolet ext-cab Z71 1995 Chevrolet ext-cab Z71 1984 Chevrolet K10 6.2 4x4 1972 GMC Jimmy 4x4 1967 Chevrolet C50 Dump truck 1957 GMC 1/2 ton stepside (not running)

07-15-2003, 11:27 AM	#12
rambler MOVE OVER Join Date: Jun 2002 Location: Warrensburg, MO Posts: 5,470	Great looking truck, I sure wish I had that to haul my hay with. __________________ No matter where you are..... There you are... Buckaroo Banzi

07-17-2003, 10:17 AM	#13
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Tony says it was a cab and chassis truck as it has the narrow rear end. It had a stake bed on it when he bought. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

07-18-2003, 03:17 AM	#14
badpeanut Not a bad nut after all.. Join Date: Dec 2000 Location: ND Posts: 1,759	Would a K20 have a TH350 or a TH400?

07-18-2003, 07:47 AM	#15
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	Yes, I've heard of it but not seen it. __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all



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