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Axle Tag Decoding


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6 replies to this topic

#1 135SoHc

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Posted June 15, 2009 at 02:26 pm

Found two tags on the diff cover. I was only expecting one tag for the ratio but found a 2nd one hidden under all the rust and grease.

one says 0759 and the other 3.2

assume the 3.2 is the ratio code for 3.21 since that seems to be a common ratio in these axles. but I have no idea what the other is supposed to mean ?

#2 ImperialCrown

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Posted June 15, 2009 at 05:07 pm

It could be the Julian date: 75th day of 1979.

#3 135SoHc

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Posted June 15, 2009 at 09:14 pm

That would directly correspond to the build date of mid march

#4 bguy

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Posted June 27, 2009 at 10:58 am

I'd almost bet money your axle ratio is a 2.94. IIRC my old 87 B250 had a 3.2 tag and I was quite suprised when the ratio inside was actually 2.94. The gears are actually stamped with the ratio. I wondered then if the 3.2 referred to the overall final drive ratio between tranny and axle.

#5 135SoHc

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Posted June 27, 2009 at 11:58 am

I found the equipment tag in the glovebox a few days ago. one of the things it included was "RR axle 3.21"

#6 bguy

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Posted June 27, 2009 at 02:03 pm

Yup. Mine was same. My label was under the hood I believe. The axle may have been changed, but it still had that 3.2 tag on it!! Go figure. <_<

#7 Trailmaster

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Posted June 30, 2009 at 01:58 am

Used to see that sometimes in the wrecking yard. I think sometimes when people change the rear axle or ratios out, they just stick the old tag back on.


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