Big drop in RPMs from park to drive. (11 Viewers)

[roaminglost]

Any ideas on this?
When I’m in Park, it’s at the 800, almost 1000 RPM, and then when I put it into Drive, it nearly stalls out, drops down to 200, and my old pressure goes down.

When we did the pump, we also did the wholesale automatic nomad valve body, so I’m not sure which one is causing it.

1990 HDJ81 1HDT

 

[TheBussman]

I can't see the valve body making a change, but the torque converter could. Was that also replaced at the same time?

vid 1 its drops way more then vid 2. Are the operation conditions different between the 2 videos?

Hows the rest of the pump tune? Do you have room to decrease the main fuel screw and then increase the idle? That should make the pump hold the idle speed better.

 

[roaminglost]

I can't see the valve body making a change, but the torque converter could. Was that also replaced at the same time?

vid 1 its drops way more then vid 2. Are the operation conditions different between the 2 videos?

Hows the rest of the pump tune? Do you have room to decrease the main fuel screw and then increase the idle? That should make the pump hold the idle speed better.

torque converter is new.
Rest of the driving is great. Just the idle issue.