hey guys i have a 95 cummins 12 valve 3500 single wheel autamatic trans when i try to put it into 4 wheel drive it feels like its geared to 4 wheel drive but the front tires wont engage i shift it to 4 low and it gears low but once again front tires dont engage any help would be great thankyou all very much

 

Start at the CAD ( Center Axle Disconnect ) and see if you have Vacuum at the Actuator.

 

i checked that and there is no vacum there my vacum lines are real soft i dont know if that matters or not but no there is no vacum on either line what causes that thanks for responding

 

Next, if your heater controls are switching properly from Defrost to vents, you know you have vacuum, it is a matter of tracking where the vacuum leak is or that the vacuum switch on the transfer case is not working. I would go to the switch on the TC and check for incoming vacuum first ( assuming your heater controls switch, they default to defrosters with no vacuum )

 

This might help.

http://www.dodgeram.org/tech/repair/..._engagment.htm

Floyd

 

Soft lines usually indicate that oil has got in the system. When this happens it can destroy all the lines, your vent control switch, vent control, 4wd vacuum switch, 4wd actuator, cruise control actuator and brake booster.
It is a very bad situation costing over $2000 to fix.

Luckily you might be eligible for recall, both my '95s were.
They will replace the entire vacuum system and give it a 7 year warranty for free.

With your VIN check for recalls here> http://www.dodge.com/webselfservice/...ilForm(%27R%27)