anybody have a 88-94 extended cab chevy?

Issue here is. If your bigger than 5'8" you'll need to make the box less than 19" front to back so staggering won't work
Worth a shot. I use to have an 89 ext cab. Didn't realize it was that much shorter than my 03. I can get 22" deep with my seat all the way back. That's at the headrest which would be further back than any other spot.

It was just an idea if he is dead set on 4, 15s.

 
My buddy has a 93 he wanted 4. 12s and it was barely gonna fit. In my 97 I removed the rear seat brackets and 62" across but the height of the box can be a issues as well
See i thought i remembered seeing 4 15s straight across in one at a show many years ago...

 
I
Mine 62 across. But most 15s are 16.5 or more across And that puts them butted right next to each other
They were and firing right at the backs of the seat too. Maybe it was 3 idk... Too long ago. Ill still have to find the one i want first. so i have time to plan...

 
They were and firing right at the backs of the seat too. Maybe it was 3 idk... Too long ago. Ill still have to find the one i want first. so i have time to plan...
I got a 96 and cab is the same as yours and my new box is 60" wide 21" deep and seats go all the way back and even recline a bit. remember the cab narrows as it goes up, tried to post pics but I am over my limit and cant figure out how to delete so I can post more but heres a link to my build log on MAF

96 GMC extra cab Moved from CA.com - Page 78

 
I got a 96 and cab is the same as yours and my new box is 60" wide 21" deep and seats go all the way back and even recline a bit. remember the cab narrows as it goes up, tried to post pics but I am over my limit and cant figure out how to delete so I can post more but heres a link to my build log on MAF
96 GMC extra cab Moved from CA.com - Page 78
I remember your build!

However, not sure if chevyguy was talking about s10 (like what I have) or a bigger kingcab type version.

That Sierra has def much more room than any s10 ext cab.

 
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