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Old 05-08-2019, 09:05 PM   #1
Electro72
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1970 GMC 3/4 ton Axle Stamp Info?

Anyone have info as to what my diff gears are with the axle
stamp?
My truck is a 1970 GMC 3/4 ton.

The stamp reads....

58 OC1 603051 6
5 19 70 A7
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Old 05-08-2019, 10:34 PM   #2
Mike C
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Re: 1970 GMC 3/4 ton Axle Stamp Info?

Most 3/4 ton GMC trucks had Dana 60 rears. If yours does, if no one has removed it, it will have a tag between two of the diff cover bolts that has the ratio on it.

Gotta' love Dana for doing that and you have to hate PO's for removing it...
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Old 05-08-2019, 10:48 PM   #3
kwmech
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Re: 1970 GMC 3/4 ton Axle Stamp Info?

BOM 603051-6 =1969-1970 coil sprung rear, 4.10 gearing, with a power-loc
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Old 05-09-2019, 12:23 AM   #4
Electro72
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Re: 1970 GMC 3/4 ton Axle Stamp Info?

It does still have the tags. I’ll check tomorrow to see what the is stamped on them.
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Old 05-09-2019, 01:10 AM   #5
kwmech
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Re: 1970 GMC 3/4 ton Axle Stamp Info?

One tag will say limited slip and the other 4.10
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