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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
I take my tails on and off all the time (have done the tinting thing twice). Dead easy to get bulbs in and out. Your brake/taillight is a 3157 and reverse/signals are 3156 (3 bulbs in total in each tail). The bulbs are almost virtually identical, except 3156 are single filament and 3157 are dual. I've used 3157 in place of 3156 without a problem. The dual filament relates to dual wattages (e.g brakelight takes up the higher wattage and the tail takes the lower). That's why you only need 3156 in reverse/signal applications (one wattage, one brightness level).
Just so you know, I just went through this exercise recently. Unless you're trying to put in a different colour for your reverse lights, good ol' off the shelf bulbs from any store work best and are brighter than any aftermarket bulb. I "overtinted" my tails a bit and tried to compensate by using "brighter" bulbs. Those "ultrawhite" bulbs were almost invisible. I got the best results wtih el cheapo bulbs. If you're going to be using those tailight covers as you seem to have planned, you'll want the brightest possible because your tails aren't going to be very bright with those covers on.
I don't think you will have a problem. I've had 3157's as a reverse light since the summer, the reverse isn't on long enuff to cause much of anything to overheat or catch fire. Unless of course you are in the habit of driving in reverse for long distances