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#1 |
Registered User
Join Date: Oct 2010
Location: Woodland Hills CA
Posts: 5
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purchasing a 1965 gmc 305v6 truck
Hey guys and gals i am tempted to purchase a 1965GMC 305 v6 ( not an inline ) it has 3 on the tree manual all original with 90k miles. I went and checked it out and it starts and idles beautifully and not drips, not much rust at all. Looks like the tires have a bit of cracking so i am not so sure how fast i can go and still be safe. My question is how are the trannys on these things and also what is the gearing...will it go highway speeds? It has the original air filter ( that takes oil? ) ....what would be one of the first things you would upgrade on this truck to give it better gas mileage and run better.. I am thinking carb ( whats the best kind ), plugs/wires, air filter unit, syn oil change, dist cap....what else? any comments would greatly be appreciated...I am VERY excited to own such a cool classic but I want it also to be a almost everyday driver and be able to hit the freeway here n Cali. I live in woodland hills and can anyone can recommend some shops in this area that specialize in older trucks and cars? Thanks so much.
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#2 |
Registered User
Join Date: Sep 2006
Location: Louisiana
Posts: 374
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Re: purchasing a 1965 gmc 305v6 truck
Take a visit over here and your questions will be answered:
6066gmcguy.org Regards, Steve New Orleans |
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#3 |
Registered User
Join Date: Dec 2004
Location: West Sacramento, CA
Posts: 368
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Re: purchasing a 1965 gmc 305v6 truck
Steve beat me to it. These guys can help with most anything GMC V6 related....
http://www.6066gmcguy.org/performance.htm |
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#4 |
Registered User
![]() Join Date: May 2007
Location: Deale Md
Posts: 4,663
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Re: purchasing a 1965 gmc 305v6 truck
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__________________
James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change! |
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#5 |
Registered User
Join Date: Oct 2010
Location: Woodland Hills CA
Posts: 5
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Re: purchasing a 1965 gmc 305v6 truck
Here are the pics. Going tomorrow to look at her and I do believe I will be bringing her home. Hey would you guys know what gears are in the rear end on this truck? I am wonderig if she will be able to reach highway speeds with no problems. They didnt put 4:11 or anything that high in the 305 v6s did they? Also I was reading about the holley 500 carb. That might be the very first thing that I do.
![]() ![]() ![]() ![]() ![]() Last edited by Ianmattchevy; 11-16-2012 at 11:40 PM. |
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#6 |
Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,079
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Re: purchasing a 1965 gmc 305v6 truck
Nice looking truck. If it has the standard, original rear gears they will be kind of low. It should do OK around 55 or 60 on the Hi-way. Not sure what kind of speed limits you have out there.
I was always satisfied with the stock Stromberg Carb. My '66 GMC 305 would get 15 1/2 miles per gallon on the Hi-way after a "super tune" just using stock Delco and AC parts. Although I have switched to Borg Warner Points in recent years. If you decide to change the rear gears, remember it will mean starting off in 1st will be more of a strain. I would suggest to keep it original if you can keep it under 60 most of the time. You can change the ratio a little by putting extra large tires on the rear. My '72 C-10 had more of a problem with high revs on the Hi-way than my '66 GMC did and I put on a set of 265/75R/15's on it and it was enough to make a difference, plus I like the look. I'm running 235's in the front. Keep us posted. Bill
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'60-'72 Chev/GMC Fan GMC 9500 Fan Detroit Diesel Fan |
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#7 | |
Registered User
Join Date: Oct 2010
Location: Woodland Hills CA
Posts: 5
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Re: purchasing a 1965 gmc 305v6 truck
Quote:
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#8 |
Registered User
Join Date: Feb 2008
Location: Sidney,b.c.
Posts: 4,425
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Re: purchasing a 1965 gmc 305v6 truck
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#9 |
Registered User
![]() Join Date: May 2007
Location: Deale Md
Posts: 4,663
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Re: purchasing a 1965 gmc 305v6 truck
I have the 500 carb on mine , it's cold nature but runs really good after it's warmed up.The GMC V6 is a low rpm engine , a lot of low end torque. I don't drive much over 50mph. I put the 63 factory plaid valve covers and a 67 air cleaner.
__________________
James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change! |
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#10 |
Registered User
Join Date: Oct 2010
Location: Woodland Hills CA
Posts: 5
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Re: purchasing a 1965 gmc 305v6 truck
COOL PLAID COVERS, where can one find some of those? also on my 65 305 what else can I upgrade? What would be a relly good air cleaner to add with the holley 500?
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#11 |
Registered User
![]() Join Date: Sep 2009
Location: menifee california
Posts: 788
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Re: purchasing a 1965 gmc 305v6 truck
my 64 gmc has 3:54 gears in the stck dana 44 rear end. i have a 350 mtr and it would sound like reving pretty high at 65. i went with overdrive tranny. if you don't do much freeway driving you will be fine.
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#12 |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,371
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Re: purchasing a 1965 gmc 305v6 truck
Clean truck. Looks like a 3/4 ton 1500 series to me. Don't believe me, just check your vin on the door pilar. Should say 1502.... This truck looks exactly how most mid 60's 3/4 tons looked like before a wheel change. Your truck still has the 15" 2 piece rims. Most 64-66 V6 3/4 tons will have the Dana 60 with 4.10 ratio. A Dana 60 axle with 3.54 ratio can be swapped from a 68 thru 72 GMC 3/4 ton with leaf springs also.
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#13 |
Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,079
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Re: purchasing a 1965 gmc 305v6 truck
I believe you're right.
I was more convinced when I took a closer look at the Spare Wheel in the truck bed. To the original poster: If true, that will change what I have stated about your Rear Gears. The 3/4 Ton should have even lower gears. Pop off the Hub Caps and post another picture, as well as checking on the VIN as mentioned. Bill
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'60-'72 Chev/GMC Fan GMC 9500 Fan Detroit Diesel Fan |
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#14 |
Registered User
![]() Join Date: Jan 2012
Location: Antioch, IL
Posts: 418
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Re: purchasing a 1965 gmc 305v6 truck
I had a 4x4 '64 GMC 8-lug truck with the 351E (and "cool" plaid valve covers).. It had tall 16" tires on the corners and at 55-60mph--it was screaming--plus I was getting 8-10mpg.. Don't count on going fast in the truck.. It was built for work. And--the GMC V6's run like diesels, meaning they operate at low RPM's to do all their work for ya..
Have fun with it.. |
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1965 gmc, 305v6, carberator |
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