Quote:
Originally Posted by Chulisohombre
Gm axle ratios are sometimes on the spid. But that doesn’t mean it’s correct. Mine says 3.73 but I have swapped axles and now have 4.10.
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The SPID just shows if someting was ordered different than the standard gear for whatever base combo the truck came with. I have not had any luck with GM's codes stamped on the axle tube being the same as what is inside the housing when I take it apart.
But the Dana tag is awesome as long as some mechanic doesn't not put it back. Or put if on something different... Like you, I have a truck that came with 3.73 gears on the SPID ('86 K30) and even had the Dana 3.73 tag on the front diff. But inside the case was a set of 4.10's.... in this case it would have been helpful if they left the tag off! (The Dana 70 in the rear with 4.10's did not have the tag on it anymore.