I recently modded a set of 01 (2 bulb) tails [again] for my 96 (3 bulbs).
I made a 2nd opening in the "brake light" area for the turn signal bulb so they share the same lens area. My brake lights are incandescent bulbs while my turn signals are led's.
The trick is getting the rounded back area of the brake light housing flat & getting the holes cut for the 2nd socket.
'96 XLT, 4.0L, 4x4 Auto, Super Cab, K&N Filter, Dual Exhaust, 200a Alt, Clear Corners, BUGGMAN LED's, Expo Power Seats & Console, LED modded '01 Tails
Anyone have the wiring diagram to compare the 99 and below to the 00 and up? I know with the jeep cherokees you could convert to the 2 bulb set up that was used by the comanchee trucks by cutting a wire and doing a simple splice. it has been a while since I looked into this so I will post once my google fu works out.