Lindsey, if you're asking me, yes, the Thrush glasspack. It has the straight-through flow described in the shop manual (don't know how important that is). But the Walker 21028 you mention has the outward appearance shown in the manual; mine has sloped ends rather than boxed ends. I know very little about these, only that the AutoZone search by vehicle make & model led me to the one I purchased, and it looks like the very old after-market muffler that was already on my truck.
I'll quote you this time! Yes I was asking you. Our rotted and falling apart muffler looks very similar to the one on Jim Carter's site. I would have preferred that, but the shipping was $1 less than the muffler to ship to my location and with the exchange rate I can't justify it. The Walker 21028 doesn't have great reviews, but I just need something for the time being till we decide what route we're taking on this truck. Let me know how it sounds!
