I'm ready to hook up the air lines from the valve on the trans cover to the t-case. I want to test them afterwards to make sure they are hooked up correctly. when I have the trans in 1rst gear and jack up the front wheel which way should it turn?
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I havn't thought of that. I would put a valve on the supply side and shut that off. is that how you did it? did yo get any better mileage or anything? what were your reasons?Junkyard Wars Crusher said:Have you considered adding a valve to enable you to "disengage" the front drive?
It is a fairly simple and inexpensive modification. I have made the change to my M51, and it seems to work well. ( However, I'm not sure if there are any long-term ill-effects. If anyone knows of any, please speak up!)
I can eloborate on the procedure if you like.
rizzo said:I havn't thought of that. I would put a valve on the supply side and shut that off. is that how you did it? did yo get any better mileage or anything? what were your reasons?
Sorry, let me rephrase the question:When going from neutral to 1st or neutral to reverse on my m51 I can hear the transfer case shift the sprag in the appropriate direction. Makes a thunk when it does.
I've never done it with the air system pressurized without the engine running, but don't know why it wouldn't work.
None of mine make any sound when engaging, it just happens. You'll never know when, but it can start to get stuck and then just walk out of trouble like magic.
Most of the time there is a release of air from one side or the other of the transfer case cylinder that can be heard. Might not be much but most of the time heard mine when going from reverse to neutral or neutral to reverse. Getting old can not remember and been a long time since I had a 5 ton.
Under normal operation there is no noise at all. The inner part rotating is an egg shaped cam that wedges an inner drum and an outer drum with change of direction. The back gear in the TC turns 17 rpm while the front does16. As soon as the back turns free, the cams lock and drive the front. Should never hear it or actively manage it, in my opinion.Sorry, let me rephrase the question:
I have the normal "sshht/thunk" when shifting between 1st and Reverse. What I'm asking is, during a loss of traction when the rear wheels actually slip and the front wheels engage, is there a noise or feeling to it?
I installed a beautifully rebuilt transfer case a year or so ago. I'm hoping it works right. We've got some snow coming this week... I'm kind of curious to try it out.
Ok, gotcha. I tried to slip the rear wheels in some mud last weekend and had no indication that the front axle engaged. I'm not even certain that I was able to cause the rear wheels to slip. In any case, it sounds like there is no noticeable indication.Under normal operation there is no noise at all. The inner part rotating is an egg shaped cam that wedges an inner drum and an outer drum with change of direction. The back gear in the TC turns 17 rpm while the front does16. As soon as the back turns free, the cams lock and drive the front. Should never hear it or actively manage it, in my opinion.
What we would be doing is cutting off the air with the valve to the poppets on the transmission. Yes if you had the air system aired up and then to be safe you would shut off the air and move the shifter from reverse to neutral a couple of times to release the air pressure from both sides of the transfer case air cylinder / lines. Also might be a good idea if you truck holds good air even if the truck has not been running to shut off air and drain the sprag cylinder. The transfer case air cylinder has a metal piston with preformed packing seals that hold the air back depending on which way the air is coming from. Then the same piston has two good size springs that mount on both ends of it. With full air pressure it collapses the spring in what ever direction you choose and engages the sprag. With out air the spring is not collapsed and the sprag is in a type of neutral.Locking that sprag in the wrong direction with an air valve seems like a real risk also. Maybe I'm not clear about what a manual air valve would do. On the T1138 it brings in the front 1/1 but on T138, it operates the direction the sprag operates to relieve the front/back difference.
Does the system make a noticeable noise or feeling when the front axle engages?
If I remember going from neutral to reverse is made a swish or heard air. Going to Reverse still could hear air release but a thung noise too as the piston / spring hits the transfer case. All my 5 tons you did not have to go into first from reverse to make the sprag switch. Reverse to neutral or neutral to reverse switches the sprag. Air up the truck and shut it down and switch between reverse and neutral or neutral to reverse and you should hear or feel the switch. Any forward gear slected after coming out of reverse the sprag should be in gaged for forward movement.
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