i was told when i replaced my rear end that i had 342 gear ratio cause i read the number GU6 from my glove box, i been driving for 4 months without any issues till today when i wanted to test my 4x4 for the winter, it goes about a foot and wont move without force. did the guy give me the wrong gear ratio? in my glove box its a whole lot of numbers but on the third row it begins with GQ1,GU6 and then G80. can somebody tell me my correct gear ratio so i can spend another three hundred on the correct rear end or if someone can tell me why when i put my truck in 4x4 it wont move. please help