I just added Rockford Fosgate T1692C 6X9's to a 1999 Ford Econoline E150. I thought I would have to use 6X8's because I didn't want to cut up the door. I had a set of 6X9's that I was using in the middle speakers (I have 6 speakers in my van). I used one of them to see if I could put 6X9's in the rear door. Like I said, I didn't think that the 6X9's would fit in the metal hole. Well, I mounted the 6X9's on the outside of the door panel and I only took my Dremel tool and ground out the inside of the wooden door panel. I mounted the 6X9's on the outside of the wooden panel and on the outside of the padding on the door, which was there because I have a conversion van, and between the wood and the padding, it held the speaker out far enough so that the hole in the metal was large enough because the 6X9's taper down from the front to the rear. That gave it enough room so that the hole was large enough for the speaker to fit in the metal hole and, like I said, I DID have to grind out the hole in wooden door panel. I found your question while I was looking for a way to get my FRONT door panels off because I have a set of Rockford Fosgate T1682's 6X8's to install in the front. I thought I was going to have to install 6X8's all around but I really didn't want to because none of them, except MTX, come with grills and I wanted to switch the grills in my van. I didn't know it would be as easy as it was. Now, that being said, the 6X8 in the side doors CAN NOT be switched to 6X9 because there is a metal bar in front of the speaker UNLESS that is just there because my side doors are set up with mechanical opening devices because I'm a paraplegic and there is a wheelchair lift on the sides so I don't know if all vans have that metal bar or not but if there's no metal bar in front of the speaker, then they can probably have 6X9's in there too. I just put the speakers in the door last night so I do know what I'm talking about. I hope this helped you out. If you have any questions, you can contact me (I am logged in so it will give my email address) and my name is Tom. Your vehicle is newer and it's the 3/4 ton rather than the 1/2 ton but I think that the same things may apply. The way you can check is just pull the rear door panels off, and see if the 6X9's you are using taper down enough, which they ALL taper, to see if they will fit in the metal hole in the door after being mounted in the door. The speakers you currently have are probably screwed into the the metal so that's why the hole is the size it is and that's why I say if you screw the 6X9's to the front of the door with the grill over them will work just fine. Personally, mine look beautiful and they fit perfectly, but as I mentioned, if you have any problems that I can help with, don't hesitate to contact me.
2 speakers
The speakers in the doors of a 1991 Ford Ranger are 6-inch speakers.
92-06
All 4 doors speakers on the Ford Expedition are 6x8.
5x8
The speakers are probably 6" X 8".
6X8 inch speakers for front and rear doors.
6.5
The front speakers in a 1997 Ford Taurus measure 6 inches by 8 inches and are located in the front doors. The rear speakers are located in the rear doors and measure 6 inches by 8 inches.
they only have them running to the rear doors
i have a 2001 ranger xlt and my door speakers are 6 X 8
2 front door speakers 2 tweeters in front doors 2 rear door speakers