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Old 04-02-2014, 09:43 AM   #1
duck457
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1965 Chevy 1/2 to Rear End Gear Ratio

I was wondering if anyone has a guide to tell me the rear end gear ratio of a 1965 Chevy 1/2 ton? The vin # is C1545F150363. I emailed the GM Heritage Museum and they only went back to 1977. I know the 3.73 was common to this truck, but the vin # decoders out there do not list rear end specs.
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Old 04-02-2014, 01:48 PM   #2
68gmsee
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Re: 1965 Chevy 1/2 to Rear End Gear Ratio

Lots of years have passed. There could have been a replacement in the past. Best thing is to remove the cover and count the teeth or look for numbers.

As an example, on my 69, the number was stamped above the passenger side tube covered by 25 years of grime. Check to see if yours is there and if it is you can get a better look at it by removing the tire and then use a wire brush to clean the area off.
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Old 04-02-2014, 02:48 PM   #3
aggie91
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Re: 1965 Chevy 1/2 to Rear End Gear Ratio

vin # is C1545F150363

Breaks down like this:

C = Chassis Type = 2wd
15 = Series = 1/2 ton longbed 127" wheelbase
4 = Truck Type = pickup
5 = Model Year = 1965
F = Assembly Plant = Flint, MI
150363 = Unit Built = This was the 50,363 truck built that year. Each yr starts at 100,001.

The Vin does not specify the rear end ratio on the 65 or 66 model year. There should be numbers/letters stamped on the axle tube near the center section. You might have to clean it off real good to read them.
The code should be something like this: HA02 17W
it breaks down to this:

HA 65-69 3.73
0217 built February 17th
W by Warren Gear

That rear end example is off a rear end that I bought on craigslist. the gears, carrier, and axles had been swapped before I got it, I just wanted to know what year the housing was for my project.

Hope this helps.
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Old 04-02-2014, 11:18 PM   #4
Captainfab
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Re: 1965 Chevy 1/2 to Rear End Gear Ratio

The differential is one of the most neglected parts of a vehicle. More than likely the 12 bolt under your '65 could use a oil change. Just pull the cover, drain the oil and have a look and see what gears you have. The tooth count is stamped on the edge of the ring gear. That way, you will also be able to visually check the condition of the inside of your differential and you will know for certain what gears you have. Plus then you will have the peace of mind knowing that your differential is full of fresh oil. It'll only cost you a couple quarts of gear oil and a cover gasket.
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Old 04-03-2014, 10:45 AM   #5
aggie91
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Re: 1965 Chevy 1/2 to Rear End Gear Ratio

Captain has a good point, a small investment of time and money now would pay off in the long run.

Even if you are not using the truck now, you could pop off the cover and drain the fluid to check out the gears...
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1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues)
http://67-72chevytrucks.com/vboard/s...d.php?t=372424

The LST Challenge:
http://67-72chevytrucks.com/vboard/s...=1#post7812257

Korbin's 1st Square: "Sunburn"
http://67-72chevytrucks.com/vboard/s...d.php?t=418618

1985 GMC Sierra: "White Trash", Korbin's 2nd now...
http://67-72chevytrucks.com/vboard/s...d.php?t=632305

Henry - 1984 Chevrolet, Owen's 1st Square
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