So for the simple reason of "why the hell not" me and my father agreed to try and put SeaFoam Trans Tune(
1PT of fluid) in it to see if it was just a sticky solenoid that was causing the problem this whole time. We put in the trans tune in on tuesday and since then I have been driving the car normally (
as in not anticipating the shift from 3rd to 4th and just letting it shift naturally) while also not trying to stress the car and to let the trans tune circulate throught the system. Today I decided it was time to test it. I went out with a friend of mine with hooked up showing the trans temp and waited for it to get around 60-65C to mimic when it failed while me and my dad were doing pressure tests along with getting it to shift almost exactly at the "Butter zone" which would be at 2,900rmp's roughly. To my surprise it did not fail even once or seem like it would fail while shifting from 3 to 4th. So after a few attempts I decided to let the transmission get a bit warmer just to see if it was not good enough at 60-65C. So after 15min of driving I got it up to 74C and it stayed there with some movement to 73C but that was about it. After testing to see if it would fail at that temp it did not. Now keep in mind; when I was testing at both 60-65C and 74C I put it through heavy load(
Going up a hill), Light load(
Going down a hill), and Stander load(
Driving down a straight street) and throughout each time it never seemed to me that it would attempt to fail and matter of fact; it shifted alot better than before(
Alot smoother and not as jerky from 3 to 4th). Now im not saying that this has totally fixed it or that this is a permanent fix but this shows me (and when my dad reads this) that it might have been a sticky solenoid this whole time. I'm not ending my search for an answer here nor am I going to stop worrying and trying to truly solve this but I just wanted to give a heads up to everyone. Thank you for all your support again, along with this mass amount of knowledge I have learned from all of this.