Newbi here from Cave Junction, Oregon.

[TJ's GMC]

Been lurking around here for awhile and decided to join because about 2 weeks ago I purchased a 64 GMC 3/4(1500) with the 305E and 4 speed. Factory power steering and brakes. Drove it home. Paid $500 for her. :thumbsup: Starts and runs like a champ. Been driving chevys and been restoring my 66 for a few years now and so coming into the GMC world is new. lol So my plans for the truck as of now is a tune up on the engine, replace the front glass, fix the mirrors, get the brakes adjusted correctly, and drive the wheels off it. Then after I get my 66 chevy done I plan to restore this one and have some fun with the 305E. But for now here is a picture and a video. Thanks.
https://www.youtube.com/watch?v=D-4W-9uhIfE

[Cayoterun]

Welcome to the forum: Looks like you got a good buy on the '64. You'll probably find there are some differences and challenges between the Jimmie, and Chevys. It's well worth it, tho. They're tough old brutes. Warning: They are addictive, Ya' can't stop and just one. Hope you enjoy your resto, and use.

[TJ's GMC]

Welcome to the forum: Looks like you got a good buy on the '64. You'll probably find there are some differences and challenges between the Jimmie, and Chevys. It's well worth it, tho. They're tough old brutes. Warning: They are addictive, Ya' can't stop and just one. Hope you enjoy your resto, and use.

Thanks for the welcome! Yes they are addictive for darn sure. lol

[snazzypig]

Looks like a great truck for the money! Just watched your video. You were wondering about the gadget on the floor. That is the foot operated bulb pump for the windshield washer. Looks like a GMC accessory, but similar types were available for for other vehicles. If its like mine, it should have a vinyl bag for the washer fluid mounted under the hood. Have fun with it!

[Ed Snyder]

Been lurking around here for awhile and decided to join because about 2 weeks ago I purchased a 64 GMC 3/4(1500) with the 305E and 4 speed. Factory power steering and brakes. Drove it home. Paid $500 for her.

Give me a call next time you're in the Medford area, TJ. I can probably help you with some parts. 541-899-5744.

[TJ's GMC]

Looks like a great truck for the money! Just watched your video. You were wondering about the gadget on the floor. That is the foot operated bulb pump for the windshield washer. Looks like a GMC accessory, but similar types were available for for other vehicles. If its like mine, it should have a vinyl bag for the washer fluid mounted under the hood. Have fun with it!

Thanks! Yeah on another forum they mentioned something about that being a foot operated windshield washer. I haven't seen any tank under the hood for the fluid. I'll follow the hoses and see what I come up with. Thanks for the reply!

[TJ's GMC]

Give me a call next time you're in the Medford area, TJ. I can probably help you with some parts. 541-899-5744.

Thanks Ed! Sure will!

[TJ's GMC]

so on my 305 vs other 305's...i've noticed mine has the "sideways" thermostat. If you've seen the video you'll see where the rad hose connects it is sideways which makes me wonder if this isn't the correct year or something?

[bigblockv6]

Looking at the video the reason you have the side mounted thermostat is because at some point someone changed the water manifold/ thermostat housing to the 1967-69 type, could be because there was a upper radiator hose that fit without modifications. A similar situation on 67-69 trucks is to use an inline six upper radiator hose with a 75-81 Pontiac V8 firebird thermostat housing.

[TJ's GMC]

Looking at the video the reason you have the side mounted thermostat is because at some point someone changed the water manifold/ thermostat housing to the 1967-69 type, could be because there was a upper radiator hose that fit without modifications. A similar situation on 67-69 trucks is to use an inline six upper radiator hose with a 75-81 Pontiac V8 firebird thermostat housing.

Thanks for the reply. I'm wondering if that's a newer 67-69 engine.

[bigblockv6]

That was my impression too that it may be a newer engine, what are the engine ID numbers? I may be able to clue in on the year if you can get them for me.

[TJ's GMC]

That was my impression too that it may be a newer engine, what are the engine ID numbers? I may be able to clue in on the year if you can get them for me.

Finally got those number for you.

Here are the engine numbers. 305E 49292I

And here is the vin number if that helps. 1502HF1643B

[TJ's GMC]

So I just found out something weird. According to my Vin number my truck is a 1/2 but its a 3/4 ton. At least it has 8 lug axles. The bed is a chevy bed I believe because it has a chevy tail gate....but the cab is GMC and so is the front clip. More mystery. lol

[Ed Snyder]

So I just found out something weird. According to my Vin number my truck is a 1/2 but its a 3/4 ton. At least it has 8 lug axles. The bed is a chevy bed I believe because it has a chevy tail gate....but the cab is GMC and so is the front clip. More mystery. lol

If your truck was a 1/2 ton, the VIN would start with 1002. 3/4 ton VINs, like yours, start with 1502. See http://6066gmcguy.com/VinNumber.html.

The first truck listed here http://6066gmcguy.com/GMC-vin-list-6769.html has an engine number lower than yours, so that could mean that your engine is a 1967 or later.

[David R Leifheit]

So I just found out something weird. According to my Vin number my truck is a 1/2 but its a 3/4 ton. At least it has 8 lug axles. The bed is a chevy bed I believe because it has a chevy tail gate....but the cab is GMC and so is the front clip. More mystery. lol

(From Previous message) 1502HF1643B

No sir, your VIN does NOT indicate a half ton.
1500 Series is a "3/4 ton"
If it were a half-ton it would start with 1002...

15 = 1500 series (3/4 ton)
02 = 127" wheel base
H = Oakland, CA build plant
F = 1964-1966 (except that HF, yours, indicates a 1964)
1643 makes it the 643rd vehicle off the line
B = 6001 - 10,000 GVW

http://6066gmcguy.com/VinNumber.html

[TJ's GMC]

That's really weird guys cause according to this sight's vin decoder it says 15 means 1500 series 1/2 ton and 02 mean 127 inch wheel base. Thanks for the help though....what's the difference between the 1500 and 2500?

[bigblockv6]

Finally got those number for you.

Here are the engine numbers. 305E 49292I

And here is the vin number if that helps. 1502HF1643B

Ok, comparing several V6's that I have your engine I.D. number is closest to the 305E that came out of my 68 KM-2500. The number off my 305E is 497570 and yours is 492921, what looks likes an "I" in there is actually a 1. I would have to say you have an early 68 engine produced in the fall of 1967. One more way to identify a 66 and earlier engine also possibly 67's have a ridge on the left side of the block about 3-4 inches left of the oil filter assembly, 68 and up do not have this, it may have been a mounting boss for industrial applications, check if your engine has it.

[Ed Snyder]

That's really weird guys cause according to this sight's vin decoder it says 15 means 1500 series 1/2 ton and 02 mean 127 inch wheel base. Thanks for the help though....what's the difference between the 1500 and 2500?

In 1967 the model number 1500 became the new designation for half ton models. 2500 became the new designation for the 3/4 ton models. Prior to that (for 1966 and earlier GMCs) 1000 was the designation for half tons, 1500 for 3/4 tons, and 2500 for one ton models.

[TJ's GMC]

In 1967 the model number 1500 became the new designation for half ton models. 2500 became the new designation for the 3/4 ton models. Prior to that (for 1966 and earlier GMCs) 1000 was the designation for half tons, 1500 for 3/4 tons, and 2500 for one ton models.

Thanks Ed.