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#1 |
Registered User
Join Date: Aug 2004
Posts: 4
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Opinions requested on this 67 GMC...
...I am thinking of purchasing a 67 GMC 3/4 ton 4WD. I had a 1969 GMC 1/2 a few years ago, so I'm not a stranger to these great trucks. This one is just a little out of my realm of expertise. It has a GMC V-6, which I have no experience with whatsoever. It's a 4 speed, and is geared to the gills (as my 69 was), but the owner mentioned a top speed of 55 MPH. The truck is in great condition, for a farm truck, and I am curious about a few things. Primarily would be gearing the truck (numerically lower) for higher top end speed. Or perhaps making up for the gearing with taller tires. If anyone has personal experience with any of this, I would love to hear your input. Also, not a real important point but this truck is "radio delete". Just wondering how many trucks without radios that you guys have seen. TIA for any help you guys can give.
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#2 |
Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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It's probably a 401 high torque V6. They'd turn out 237HP @ 4000RPM's and put out 372ft lbs of torque at only 1600RPMs! Pretty cool engine, I've never seen one though. I just know the specs on it.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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#3 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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6 SPEED MANUAL, WILL HELP TOP SPEED ISSUE
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#4 |
Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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that truck would be pretty cool! 305 V6, SM420 transmission, Rockwell T221 transfer case. Most likely 4.56 gears if the p/o says the max speed is 55. i am dying to see pics!
Radio deletes arent really that hard to come by, I bought mine for $10 and about the max I have seen is $20 for one.
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1969 GMC K2500 ![]() 1996 Honda Accord 2007 Kawasaki KLR 650 |
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#5 |
Registered User
Join Date: Aug 2004
Posts: 4
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Thank you all for your input and for the welcome to the board. First off, I didn't take any pics when I went and looked at the truck, but really wish I had. I know I will be looking at this truck again soon, so I will try to get a few snaps then. I had a feeling that the gearing was around 4.56, and you guys are kinda confirming that. There wasn't an option list on the glove box door. The P/O didn't have any idea, and the truck doesn't run at the moment. I know that the truck doesn't need much to get running, as I talked to the last mechanic that did work on it and he knows the history of the truck. Big thanks to you, Moonlight, for the article and the chart. And as far as "granny gear" trannies, I had one too. You could pull the moon down with one if you could get a rope around it, heheh.
Just to let you guys know a little more about the truck, it's on a farm, and like I had mentioned before, was a farm truck all it's life (hauling grain and livestock). And of course they have the spare bolted up to the front of the truck (don't get much more "farmy" than that, heheh. But it has been well taken care of, much to my dismay of knowing how well farm equipment is cared for. Currently there is a ton of dirt on it, as it rests in a shed. It sits on split rim 8 bolt wheels which I will be looking to replace if I buy it. So if anyone knows what wheels will fit over those hubs sticking out, I'd appreciate info on that too. This is a base model truck, with no trim, or any real options inside and out. Once again, I appreciate any and all info I can get. Take it easy!! |
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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First and formost...welcome to the forums. Lots of info here, and lots of deals to be had. Where do you call home?
As for the engine, it is most likely the GMC 305, but it could be the 351. most liklely 305 though. I think the 351 was a one ton option only. Gearing...I have found that many people do not know what 5000 RPMs sound like. I have owned a 4.10 geared truck and it could go over 100 MPH. I have spoken to quite a few ppl with the exact same combo as that truck had, tell me that 55 was the max. My money says the farmer is scared to go any faster becouse it makes too much noise. A quick cheap yard sale/swap meet tach will prove/disprove this. My money also says it has 4.10 gears. GMC knew ppl took pick ups onto the freeway. That and the unreal low end torque that the V-6's put out makes higher gears (numericly lower) easy to do. All of the 305/automatic 1/2 ton trucks I've seen had 3.07's in them, and still pulled like a SOB. (including my SWB GMC...it's an ex-305 truck) |
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#7 |
Account Suspended
Join Date: Jan 2003
Location: Shadow of Lambeau Field
Posts: 5,597
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Welcome to the board. You can use any steel or aluminum 8 lug wheel from 60's through 90's on that truck. Sounds like a good purchase.
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#8 | |
Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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Quote:
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1969 GMC K2500 ![]() 1996 Honda Accord 2007 Kawasaki KLR 650 |
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#9 |
Registered User
Join Date: Oct 2002
Location: West Des Moines, Ia
Posts: 3,233
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actually the 351 was also a 3/4 ton option as my grandad had one, as far as those v6s go if you want a work horse of a truck i really would reccommend nothing else i have 2 of the 305s and one 351 all waiting rebuilds in my storage shed, i hope one day to put it in one in my truck.
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Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO |
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#10 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,684
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Welcome to the board. Can't add too much to what has already been said. The front axle should be a closed knuckle Dana 44. When I got my 69 K20 it had a 307, 3 speed and 4.56 gears - really pushing it at 65 mph (without a tach).
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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#11 |
Registered User
Join Date: Aug 2004
Posts: 4
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Thank you all again. If I can get the owner to give me a price, I will prolly pic it up. I think it will meet just what I'm wanting to do with it. Get back into a good 'ole truck, (I miss my 69 GMC), and have plenty of tug for my 5th wheel. BTW, I'm in Northeast Kansas, for those that were curious. When I do get around to getting it, I'll try to get pics up. It really is in good shape and think you guys will appreciate such a find. I appreciate the warm welcome from all of you. Now back to searching the board, heheh.
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#12 |
Born To Lose Club
![]() Join Date: Feb 2003
Location: Calgary, Alberta/Oxenden, Ontario, Great White North
Posts: 13,306
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Welcome To The Board!!!
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Brian Smith ![]() 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 20 Yrs - 1 of 208 Built & Sold In Canada! - 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 2 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 15 Yrs - 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 13 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 6 Yrs - 24HP Diesel/H120/54D/260B/SB1154. |
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#13 |
Registered User
![]() Join Date: Mar 2002
Location: Dallas, TX
Posts: 555
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The 351 V6 was an option in 67 and 68 for the 1/2 and 3/4 ton 2WD. The 305E V6 was the only V6 choice for the 4x4 in 67 thru 69. The rear end gear ratio was 4.56 with no optional ratio. 55 MPH top speed sounds about right. It makes the truck almost unusable on many roads. I changed my ratio to 3.73 with 33 inch tires and can keep up with traffic now. I recommend replacing the carb with the Holley 500 to get more power. Oh, power steering is a must if you plan on driving much. I have done the conversion and can give you some help.
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1968 GMC 305 V6 3/4 4x4 Stepside 06 Corvette Daily Driver Dallas TX |
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#14 |
Registered User
Join Date: Aug 2004
Posts: 4
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Erl, thanks for your input. The carb change and installing gears wouldn't be a problem, but I have a couple of questions for you. What kind of gears (e.g. Richmond?) did you install and where did you get them? Did the 33" tires fit with no mods? And, I would REALLY appreciate the info on the power steering install. I used to strongarm the 69 I had and don't feel like working out again, LOL. Thanks for the info. And thank you Canadian for the welcome.
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#15 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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If you get this, I may be able to get you power steering parts, there's been a couple v6 trucks show up in a local yard again.
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#16 |
Registered User
![]() Join Date: Mar 2002
Location: Dallas, TX
Posts: 555
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The carb info is on Jolley's 60-66 GMC page. A Holley 500 and a adapter bracket are listed and can be purchase from JEGS. You can use a 5/16 by 18 inch brake line for the fuel line instead of what he shows. It was the original style and looks good. I bought the gears from Randy's R & P. You will need a new carrier to go to a 3.73 or 3.43. I went ahead and got the posi unit. I have 16 inch factory rims with the old time big lug mud grips that are about 33 inch in height. They have never rubbed, but I mainly travel on paved roads. Longhorn Man is right, you will need the pulleys and pump bracket from a 305V6. A 69-72 4x4 steering box and standard hoses are the main components (check with Teeitup). I also have the part numbers for the required new drag link. Modifying the frame is a little tricky, but I can help you with that.
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1968 GMC 305 V6 3/4 4x4 Stepside 06 Corvette Daily Driver Dallas TX |
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#17 |
Senior Member
Join Date: May 2001
Location: West Central Minnesota
Posts: 568
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Longhorn Man, Are those V-6 parts still available? I'm looking for PS pump brackets and pulleys.
Bob
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V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel |
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