QuadraTrac Emergency Drive Shift Valve and QuadraTrac Lever Info?
So, from all I can tell, the quadratrac has no shifter, tho i've been told different things about all this, that i can believe. my valve has no vacuum going to it and no switch in the glove compartment (like i've been told there should be) for the reason i believe to be cause someone dropped an 85 body on my 76/77 cj7.
but i'm curious......cause there's a lever on the driver upper side of the xfer that can be moved when the wheels are off the ground. and i'm curious as to verify what selection it should be in and that the xfer is working like it should etc
any info on this type of xfer would be appreciated!
The low range unit, if you have one, is a cylindrical case bolted to the back of the transfer case. Not all qtrac had a low range unit. There is a shifter on it that is in neutral in the middle, high to one side, low to the other. I don't remember which is which, but you will know if you are in low gear. I also lack a shift mechanism due to a body swap, but there should be one near the driver seat to go from H-N-L. The vacuum shifter in the glove box switches from normal to "emergency" drive. In other words, full time 4wd to part time 4wd. You can usually find a used one on ebay. It routes vacuum to one side or the other of the vacuum motor, depending on the switch position, on the back passenger side of the case.
well i'd say this is all quite helpful! thanks! yeah i'll need all that for sure. i'm def have the low unit and need shift linkage and a emergency switch. plus my valve has a hole on the bottom end of it. and where did this indicator switch go to? some type of light?
i'm worried tho, i'm sure the chain is loose, it clunks every time i shift and/or let off the gas and get back on it.
I have a Quadratrac, and when I turn the emergency switch in the G-box, I don't notice any difference in performance. I have read that the diaphram could be shot. How do I tell if I'm in E-drive or normal - Is there a way to tell from the emergency drive indicator switch shown on that diagram?
The indicator switch on the case grounds the "emergency drive" light on the speedo cluster to let you know you are in 4x4. Even if your light/wiring is not working, you could switch back and forth and see if you get continuity between the switch terminal and ground in one position and not the other. You can also use a vacuum pump, syringe, or even your mouth to create a vacuum on the motor and see if it shifts/holds a vacuum.
I cant tell a difference either, are there two lines running from the switch to the engine? After doing a motor swap I have to small hoses coming from the heatbox glove box area. I haven't traced them yet.
1978 Cj7 360, Yellow.
Yellow Jeep Club member # 1982
Tennessee Vol Jeep Club # 1
Emergency drive eliminates the slippage that occurs within the transfer case. This slippage is what allows it to be a fulltime 4WD tcase.
The emergency drives essentially locks the front and rear driveshafts together so that equal power goes to both axles. It's then behaving like a transfer case would on a vehicle that has a part time tcase when shifted out of 2WD and into 4WD.