Mccormick cx100 4x4 control and transmission question

I was wondering if anyone might have some input into the early CX100s (McCormick, but made by case) I just purchased one in a fairly decent shape but can't get the 4x4 to disengage with the switch, so wondering if anyone might have input into how to get it to disengage or the wiring. The other question was about the transmission. before I bought it I noticed that the reverse gears work in all 8 ranges, hi and low, but only work when the selector is on the high torque and not the normal operating speed setting on the side of the stick. When I talked to the dealer they said it should operate in both settings bringing the reverse speeds up to 16 gears, but when I read on tractordata is said that both the McCormick and Case CX100 has 16 forward and 8 reverse gears. If I try and engage any of the reverse gears in the normal speed setting when the clutch is let out roughly a 3rd it will move slowly, but when I let the clutch pedal out all the way the tractor comes to an instant stop and stalls. The dealer thought it was an issue that the transmission was engaging both high and low gears at the same time causing the sudden halt and stall. Just curious if anyone has any input into it as I am not familiar with this model. Thanks for any help!

I have the CaseIH cx 100. I'm trying to think how that goes with the 4x4. Any time you apply the brakes, the 4x4 comes on. It really helps when slowing down from road speed with
loaded wagon as front wheels are holding back even though they don't have any brakes. So in conclusion, if you don't have foot on brakes the 4x4 should disengage. Now with the
reverse, yes it will work with the clicker on stick in either setting, high or low. But clicker will not change reverse speed. In other words, you only have 8 reverse speeds.
Moving clicker will not change speed.

According to the manual I bought they have a 3 position switch for 4x4, you have on, off, and auto, and the 4x4 always engages when the brakes are applied. So the 4X4 must have some sort of electronic engage/disengage unit and mine is just perm set to engage, have to see if anyone knows how to fix it or get the service manual. Ah okay on the reverse, yeah mine if the switch is in the rabbit setting it will straight up through you out of the seat when you let the clutch out, but lower setting works perfectly fine!

I know nothing about your model of tractor. I do know most of the MFWD systems are spring applied and hydraulically released. SO yours may have an electrical issue that is not releasing the clutch pack. Also I have had them that the clutch plates get damaged by slipping and they stack up with parts of damaged plates between the plates. This makes the clutch be "locked" all of the time.