I am adapting a 4L80E to my 4BT. The tech. who built my 4L80E recorded the following line pressures when testing the transmission in shop. Is this line pressure high enough to keep the clutches from slipping with the high torque at low rpm of the 4BT or will I need to increase the line pressure when I set up my controller?

In "drive" with no load on the trans

600 rpm 80 psi
1000 rpm 120 psi
1500 rpm 120 psi
2000 rpm 140 psi

In "drive" with a load
600 rpm 80 psi
1000 rpm 120 psi
1500 rpm 150 psi
2000 rpm 190 psi

The pressure is going off the throttle position. Higher throttle position = higher pressure.

 

Depending on the year of transmission, other than idle pressure being a little low, you appear to be right in the ballpark for numbers. Reverse should be higher, from memory, at something close to 300.

what power/torque numbers are you looking at from a 4bt