My friend has an 06 Dodge 2500 48RE with 42,000 miles. He has a hard time getting it in 4 lo. When he tried putting it in 4 lo sitting still it would not go in so he tried coasting ahead and it went in. Also sometimes when he's cruising along in Drive it will just pop into neutral. His son had about the same problem with his truck and it was a loose transmission. Any ideas?