Back in the beginning of June I had to take my truck to them to diagnose a major oil leak, A/C and overheating issues on my truck. to fix the oil leak they had to remove the cab. They did an excellent job on all repairs. The other day I went to put my truck in 4wd and it would engage the front axle, it worked prior to have them do the pior work. After extensive research on line on what could be wrong, yesterday i started to see if I could figure out what was wrong. No bad fuses found. I did find two vacuum lines broken and though that would fix it. still no engagement of front axle. Decide to drive to shop to tell them what i'd done so far a set up an appointment to get it fixed. Bob said lets go take a look at it. He started looking around and found another bad vacuum line, he fixed that. took it for a drive and still not working. He looked futher and found a line off front hub. put it on, drove it again Still no working. He did a bypass of solenoid and it worked. He went to see if maybe he had one in the shop. he didn't but then founf out the two lines on selenoid would backewards. That fixed it. I asked them what I owed them and Bob said nothing, as maybe when the were working on mt truck earlier they might of broken the lines and inadvertently hokked them up backwards. Thank you Bob.