[1badazzchevy]

Your Sierra should have stock 6.5" speaker locations. So you'll have no problem with the 6.5 component set. For the rear, the 4x6 plates (4" and tweeter) are nice.

 

[99GoldSilverado]

I put Polk Audio 4x6" db series in the rear and Polk 6 1/2" db series components in the front doors. :thumbsup:
Got it all at Crutchfield. Bought one set and got the second at half price. Came with detailed instructions, mounting plates and wiring harnesses.
Shweet sound :smokin:

 

[OKLAGMCRUISER]

You have 6.5" up front and 4x6 in the rears...replace the fronts and clip the rears...and of course amp em.

 

[00sierra]

if i were u, i would go with some decent pioneer 6.5's in the doors. i have an ok set of pioneers 2-ways (around 60 bucks online) in my doors without an amp and they sound great. also, for a little mroe money, ive heard nothing but good things about the infiniti kappa component speakers. they are probably worth checking out.

if you wanted more midrange sound, you could invest in some kickpanels. they involve a lot more work, but would be worth it in the end. that would be a good place to put a 5.25 and a tweeter.

i have an obs gmc and i know i couldn't fit the magnet of anything bigger than a 4x6 for the rears. from what i have seen, i dont think nbs is any different. i do recommend u invest in some good 4x6s because i ahve some cheap pioneers that dont sounds great when cranked up compared to the rest of my stuff.

i have a pair of the same subs u got in a box i made. how do they do with that much wattage running to them? i only have 150 apiece running right now. how long have u been running them with that much power?

Thanks for the help guys. I have been running the 10w0s like that for around 3 months now and they sound great. I think I am going to go w/ some good 4x6s in the back, been looking at the pioneer 3-ways. I think for now I am going to use 5 1/4s in the front doors and see how it sounds. Do you really think that I should amp the door speakers? How big of an amp would I need to do the 4 speakers? Thanks