The 10w6's probably aren't going to sound as good as they did in the other vehicle. Of course I don't know the vehicle. I'm assuming it was something rear firing with appropriate airspace.
It was an S-10 extended cab. VERY small sealed box .5 cu ft for each sub firing down. Sounded awesome, but obviously a small cabin compared to the Tahoe. What I'm thinking of doing is a down firing box the width if the cargo space and not going over the height of the rear 1/4 panels and just deep enough for the subs to fit. I was thinking of going the width of the cargo space just to get a little more air space. I might cut it even smaller, the length of the 60% bench seat portion allowing me to put the 40% seat down if needed. I'm going to talk to a local stereo shop that has helped me out a lot in the past to see what he thinks is best. I'll be using a JL 500.1 for the subs and a JL 300.4 for the mids and highs. The front doors I'm thinking of going with Infinity Kappa Perfect 6.1 and the rear doors Infinity Kappa 63.9i and ditching the 4x10's in the ceilinhg. I had Infinity Kappa's in my S-10 and LOVED them. I don't see a reason to try something different if I completly satisfied with them in the past. What do you guys think?