The Envoy may have the following ring gear sizes (in addition to the 7
* 8.50 Ring Gear
* 8.625 Ring Gear
* 8.80 Ring Gear
These diffs use 10 bolts to secure the cover.
As to the '3 3/4"'
As to the Acvance Auto Parts web page, what a joke!
BTW, my parts terminal shows only one rear rotor size for the vehicle,
does not depend on the differential.
Peter, the Advance site I mentioned to OP showed only 1 number for 2wd
and 1 number for 4wd--and was as you said "does not depend on the
differential". I hope you meant the AutoZone site was the joke, not the
Advance site I quoted;). AutoZone was also the site that mentioned the 3
3/4" ring gear.
I don't own stocks in Advance, but it seems I've found a *few* higher
quality items there than some carried by AutoZone. s
Just to let all who replied know, I took the old rear rotor to
autozone and compared it to the ones they were offering. I think the
old rotor originally came from advanced auto. Anyway I ended up
purchasing the Duralast 55038
It measured the same as the old rotor. Fitted perfectly. Though who
is to say advanced autos sold me the correct one in the first
Just a note, I also had to replace one of the rear calipers. The new
caliper they gave me had been put in the wrong box. The labeled
'driver side' box had the passenger side caliper in it. Moral is
always to check to the old against new!!!
Thanks to all who replied.
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