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Hello, first off yes you can put the older dash in the 99 but you have to drill out all the spot weld's the hold the steering column mounting bracket on and swap in the 88-94 bracket in to your 99 cab, next yes suburban door's fit on a crew cab, but you can not convert the rear door's like you can the front's to any year, in other word's you can not install 92-94 door panel's on 95+ rear door's or vice versa, you have to use the year door's that match the style interior you want. Like I alreay mentioned all the year's front door's can be interchanged. Also lastly yes a standard bench seat will fit in the back of the crew cab. I hope this help's you out.new to this form and glad to find it been trying to find out how to convert a ext. cab to crew cab for a long time found this site this weekend got some questions any help would be great i have a 1994 ext. 4x4 and have bought a 99 crew cab but has no interior and one rear door will a surburban back doors work and will the dash from the 94 work and will a bench seat from a standard cab work for a back seat and what kind of drive shaft do i need to find thanks
I would personally keep the one ton and shorten the frame and put the shortbed on it!