Alright managed to do some pressure testing on P1 and Pump at the same time. I ran into town so I could type this up from a computer instead of the cell phone I have been using for all previous information.
First off the discrepancies:
P1 initial pressure is supposed to be 80 psi at idle, 1F, neutral, I get 300 right off the bat.
Speed clutch minimum pressure is supposed to be 320 psi in any gear, I have 280-295 across the board all gears.
Direction clutch is supposed to be 55 psi lower than P1, and at idle I get 330 psi, which is above my P1 pressures.
From idle to high idle, my psi on P1 only goes up about 10 to 20 psi, in all gears.
On this test drive 2F/2R worked fine but 1F/1R stopped engaging at all. I did notice however that 2F and 2R are slight lower on the P1 psi ranged than other gears. 2F: 280 psi, 2R 285 psi, all other gears 295psi.
When shifting into 1F or 1R, the pressures on both pump and P1 dropped to normal psi as other shifts, but instead of the 1 second to shift, it happened in a millisecond and then the vehicle did not move with the exception of slight power going to the wheels but only moving them a couple of inches in the selected direction.
Another consistent issue I noticed was the difference between downshifts from 4F to 3F versus 3F to 2F.
Shifting from 4F to 3F, the pressures drop to normal shifting psi and after a second go back to pump 360, P1 295psi.
Shifting from 3F to 2F, the pressures will drop for a slight moment, bounce back up to pump 360psi, P1 280 PSI, THEN drop again, and after the normal pause, go back to running pressures and 2F actually engages. For some reason the shifting always takes that extra couple of moments for the random pressure fluctuation before the actual shift occurs.
I also experienced a random switch from 4F to 4N while driving down the road at 18mph, it did it several times very quickly but too fast for pressures to drop. After letting off the throttle it stayed in 4F and didn't give me any troubles.
Thoughts?
