4l80e pressure test results
Thread Starter
On The Tree
Joined: Aug 2012
Posts: 145
Likes: 1
4l80e pressure test results I just want someone to look over my pressures to tell me if they look good. The transmission seems to be running fine. I just rebuild it roughly 1000miles ago due to it being rebuilt incorrectly the first time.
The gauge is a Stewart Warner 400PSI gauge with electric sensor (not sure how accurate but its what I got to monitor it). Tranny is dual fed directs, sonnax boost valve.
Idle
P - 75psi
R - 75PSI (throttle up it hits 300PSI no problem)
N - 75PSI
D - 100PSI idle (throttle up 180/200psi)
3-2-1 (same as drive)
Cruising the pressure stay the same until I give it throttle, then it will spike up to the higher numbers. One thing I noticed is when warm, the pressure drop some but I am leaning towards a gauge issue (gauge gets to hot to touch the face and it has a huge amp draw). I also get a clunk in reverse but believe thats the yoke needing to be greased.
The gauge is a Stewart Warner 400PSI gauge with electric sensor (not sure how accurate but its what I got to monitor it). Tranny is dual fed directs, sonnax boost valve.
Idle
P - 75psi
R - 75PSI (throttle up it hits 300PSI no problem)
N - 75PSI
D - 100PSI idle (throttle up 180/200psi)
3-2-1 (same as drive)
Cruising the pressure stay the same until I give it throttle, then it will spike up to the higher numbers. One thing I noticed is when warm, the pressure drop some but I am leaning towards a gauge issue (gauge gets to hot to touch the face and it has a huge amp draw). I also get a clunk in reverse but believe thats the yoke needing to be greased.
