Re: S10 rear end id.
Those codes are only listed on the spid, not on the axle/housing.
Pull the cover. That way you can inspect it, see what you have, and you’ll want to change the fluid anyways.
The 8.5 was used on 4.3 5 speed trucks/blazers, and all zr2 trucks(4” wider than reg 4wd, 8” wider than 2wd). The axle tubes are bigger at the center section and they neck down before the spring perches.
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