My 2007 mercury mountaineer want pull when u put in reverse but does fine in forward so what would be the problem?

SOURCE: 1998 Mercury Mountaineer Plastic Fan

yes this sounds correct but if you want to get a diagram and step by step instructions try "autozone.com"

SOURCE: 1999 mercury cougar bearly moves when put in gear

Does the fluid smell burt or is it discolored

SOURCE: my 2002 mercury mountaineer have no problem going forward but it seen like when i put it in reverse the back wheel lock and it out out a funny smell

It sounds like you have a loose brake shoe inside one of your rear axle brake drums. You will have to remove the rear wheels and brake drums to find out for sure.

SOURCE: my 2002 mercury mountaineer have no problem going forward but when i put it in reverse the back wheels locks and give off a burning rubber smell .

check the parking braske that is inside the rear rotor. the back brakes has brake pads and a parking brake shoe

SOURCE: I have a 2000 Mercury Mountaineer that runs

Is the check engine light on? Mountaineers are bad about developing vacuum leaks which will lean the engine out and cause it to stumble at idle while in gear. Check for p0171 and p0174 codes.