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That would be great! I had mine in the shop today again. Checked the c7 coil and it seems to be very low impedance also. Checked voltage to the coil was a little over 26v idle in mode. Checked the top of the coil with a feeler gauge for magnetism, none. I didn’t have my scope at home but I...

I haven’t got back to that problem yet. From what I’ve read it looks like the c7 solenoid is powered 12 volt. Not duty cycled? I haven’t checked yet but will when it warms up a little. I now have a second truck and can swap parts if needed. Also should have a known good electrical to compare...

I’ve got several calls into Allison and transfer case rebuilders, so far no one can provide info on c7 valve body gasket?? The exploded views don’t show c7 valve body in place or the attaching bolts or gasket if there is one?? Hope to hear something tomorrow? I have removed c7 valve body...

I checked the main on the bottom. I will test the other when I get the truck back in the shop. later today.

No c7 wasn’t engaged. Good thinking I will do a main test with c7 engaged. I haven’t found a breakdown with c7 valve body to the transfer case to see if a gasket is used. I wouldn’t think they would let cast iron sit directly on aluminium ? Another thought, with mode on the transmission...

Ok main pressure is between 235 and 250 at idle. Can anyone tell me if there is supposed to be a gasket between c7 valve body and the transfer case?? Seems like there should be but I don’t have one there. Did a leak down,100% leak down. From under the valve body?? Or valve body is...

I didn’t check main pressure, the transmission functions really good. No shift flare ,no slipping and no codes. You are probably correct on 1st gear . I’m going to do a leak down on c7. I will check the main pressure just to be sure. I haven’t pulled the 2 filters just the screen on the...

Ok I had time to test pressure for the c7 clutch pack. Idle it’s only 65/70 psi. It’s is the same in 1st as it is in mode. So looks like the tcm is functioning fine. Anyone have a good source for transmission/ transfer case parts. Allison is crazy expensive! Fluid volume seems very good...

Thanks!

Yes it does.

I jack the one wheel up put it in mode and one wheel spins (rear). Put it in first and it will drive off the jack no problem. I know it’s a little different?? I will test pressure on c7 to verify what I think is happening.

Hi everyone I’m again working on my Lmtv. The problem of the day is the transfer case doesn’t engage 50/50 when mode is selected. However it does when I select 1st gear. I checked the scavenging screen, looked real good. A few bits of plastics or gasket material. I am going to check c7...