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post #1 of (permalink) Old 11-15-2004, 11:29 PM
johnboy385
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how can i identify?

I have a 1975 1/2 ton 4x4 chevy and i hear everyone talk about how it would a lot of stress on my 1/2 axels if i was to run some big tires. Well i have a friend who claims his grandpa has a 1 ton 4x4 chevy truck but the truck doesnt have a body on it. i know i can tell a 1/2 ton from a 3/4 by looking at the 6 or 8 lug axels. my question what do i need to look for to tell if this truck is a 1 ton or a 3/4 ton if they are both 8 lug axels? he says it is a rollin chasis with tranny and transfer case but no motor or body. i just want to know what is really there before i spend some money.
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post #2 of (permalink) Old 11-16-2004, 02:55 AM
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Re: how can i identify?

Depending on what year it is...

A K30 (1-Ton 4x4) will have for sure a 14 bolt fully floating rear axle in the rear. In the front will be a kingpin style open knuckle Dana 60.

A K20 (3/4-Ton 4x4) of 73-80 vintage will have a 14 bolt fully floating axle in the rear. In the front will lie either a Dana 44 front axle, or a Dana 60 like those found in K30s. A K20 of 81-87 will have a 14 bolt rear axle of either fully floating or semi-floating design. The front will be a GM corporate 10-bolt.

Another unique feature of the K30s are a different spring pad width on the rear axles than on the K20s. I'm not sure the exact specifics, but that's a start.

Here's an Axle Identification Guide
post #3 of (permalink) Old 11-16-2004, 01:26 PM
 
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Re: how can i identify?

Isn't the frame height another thing to look for? I know the 3/4 ton is taller than the 1/2 ton, but how about the 1 ton? I assume it is, but don't want to say so without knowing for sure. Just curious.
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post #4 of (permalink) Old 11-16-2004, 03:00 PM
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Re: how can i identify?

[img]images/graemlins/goodpost.gif[/img] Possibly, if I've got time I'll measure the frames on an '84 K20 and an '82 K30 we've got at work.
post #5 of (permalink) Old 11-17-2004, 08:44 AM
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Re: how can i identify?

</font><blockquote><font class="small">In reply to:</font><hr />
A K30 (1-Ton 4x4) will have for sure a 14 bolt fully floating rear axle in the rear. In the front will be a kingpin style open knuckle Dana 60.

[/ QUOTE ]

Just to add, the D60 will have 3 U bolts holding the front leaves instead of 4. Or you could say that on the pass side there will be one Ubolt. One side of the pass-side has the bolts running right into the center section and does not use the U bolt there. If your looking at the diff cover from the front, just below and to the right there should be a D60F marked into the housing, not the cover, right in the webbing.

If it turns out that it is a D60/14Bff combo, snag it. If you don't want to use it, you can always sell it for a good price. [img]images/graemlins/cool.gif[/img] I would get it and use it though, if your planning on running big tires and doing some wheeling.
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