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What are these RPO codes?

broc944

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I have looked at every RPO chart I can find, and none of them have these three codes, XYT, YYT,ZYT. Anyone have any info on these three?
 
I couldn't find any ending in T but the ones below are the closest thing there is on my RPO list:

XYN : LT235/85R16E, R/PE, ST TL ALS BL FRONT

YYN : LT235/85R16E, R/PE ST TL ALS BL REAR

ZYN : LT235/85R16E, R/PE ST TL ALS BL SPARE


All 3 of these refer to front, rear, and spare tire size. What kind of truck are the codes from?

Rick


 
I saw these also, I have a 91 Burb, PO told me it was a special order State vehicle, a couple of the RPO codes sort of confirm his statement. So I am thinking it might of came with a set ouf non-standard size tires.
 
the codes stand for LT235/85r16-e on-off road steel belted radial ply blackwall. xyt- front k2-3 series only yyt-rear c-k2 or k3 series only. zyt- spare c-k2 or k3 series only.
 
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