mudrascal78

The 4l80E TransGo HD2 Instructions for the Pump Stator Drill Size Hole was:

"-Pump Stator:
Step 4. Under "X" drill a 3/64 (.042 - .055) hole thru side of wall in direction of arrow."

I accidentally drilled that hole to 4/64 (1/16) .062 ... will this be an issue or should I buy a new 4l80E stator and drill the correct 3/64 hole?

On a side note Jakes Performance instructions for his (4L80E Valve Body Recalibration Kit Install) he states:

"On heavy towing or any application that sees wide open throttle often, we recommend drilling a .061” (1/16”) hole in the pump from converter charge to line pressure as shown."

But again I am using the TransGo HD2-D 4l80E Reprogramming Kit which states:

-Pump Stator:
Step 4. Under "X" drill a 3/64 (.042 - .055) hole thru side of wall in direction of arrow.

This is for 2003 Chevrolet Truck Silverado 2500HD 4WD 6.0L SFI 8cyl.

Any advice or help is appreciated!

PBA

The .0625" hole should be fine. If you want to shrink the hole size, you could peen it closed then re-drill it. I would leave it alone. Jake has these units down. You should be fine.

clinebarger

If your not running a aftermarket Pressure regulator valve with built-in "Lube to Line", The 1/16" hole will be fine.

mudrascal78

Thanks to you both for the replies, advice, and information.

I called TransGo and the tech stated at first it would be ok but when I told him I would rather be safe than have to redo it again he stated that it may be just a tad bit to large for his liking. He offered me some ideas though. I liked his idea of using a very small split cotter pin through the hole then snipping short and bending the prongs over but with the high pressure and vibration I didnt know if this would be such a good long term solution. Also, another idea was to use a ball pein hammer or something similar and give it a couple hits to make the hole smaller. With it being small area to reach I thought the safest thing to do would be to order a new pump stator cover.

As I write this update and reply I may just go with you guys idea as now another problem arises with the new pump stator cover I ordered. It is an aftermarket new pump stator cover and seems to have an issue with the depth of the (TCC enable valve) in the pump stator bore. I will make a new thread and post on that possible issue / problem.