I got a Mega Monster 2004R transmission from a friend that took it out of his GN before selling it. Supposedly a low mileage unit that was working well when removed. It sat up with all openings well sealed for about 3 years.
But he did say his son had taken the pan off and messed with it but was not sure what if anything was done to it. Looks like the pump may heave been taken off but not sure. He did not make any promises about it and cautioned me to check it out good.
Before it was installed, I pulled the pan and everything was clean on the inside and looked right so I just put a new filter and pan gasket on it and installed it with stock converter. I got the truck back on the ground, added fluid and went through the gear positions to get the fluid where it needs to be. You could tell it was going into forward and reverse when selected but I could tell it was slipping. I never did try to drive it.
I put the gauge on it and am barely getting 20 psi at idle in any gear position. I pulled the pan and made sure the pump regulator valve, spring and boost valve were correctly positioned and free. It all dropped out when I pulled the snap ring so could not see how it was installed. Put it all back in and tried it again. Pressure is still low. I kept it on the stands and got rpms up to about 2000. Pressure did rise to about 50. Did not change in L1 or any other position. One odd thing i noticed is when the TV cable was pulled about half travel, the pressure would drop to about 35. It did seem to change gears when in drive and idled up to 2000 rpm's.
Can anybody think of anything that would cause the low pressure besides the pump being toast? All ideas appreciated.
But he did say his son had taken the pan off and messed with it but was not sure what if anything was done to it. Looks like the pump may heave been taken off but not sure. He did not make any promises about it and cautioned me to check it out good.
Before it was installed, I pulled the pan and everything was clean on the inside and looked right so I just put a new filter and pan gasket on it and installed it with stock converter. I got the truck back on the ground, added fluid and went through the gear positions to get the fluid where it needs to be. You could tell it was going into forward and reverse when selected but I could tell it was slipping. I never did try to drive it.
I put the gauge on it and am barely getting 20 psi at idle in any gear position. I pulled the pan and made sure the pump regulator valve, spring and boost valve were correctly positioned and free. It all dropped out when I pulled the snap ring so could not see how it was installed. Put it all back in and tried it again. Pressure is still low. I kept it on the stands and got rpms up to about 2000. Pressure did rise to about 50. Did not change in L1 or any other position. One odd thing i noticed is when the TV cable was pulled about half travel, the pressure would drop to about 35. It did seem to change gears when in drive and idled up to 2000 rpm's.
Can anybody think of anything that would cause the low pressure besides the pump being toast? All ideas appreciated.